《Java从入门到精通》src9-25
find . -name *.java |xargs -i sh -c "echo {};cat {}" > ../all.java[op@TIM src]$ cat all.java
./ch09/���渚�9-1/浠ｇ��9-1.java
class Person
{
String name ;
int age ;
void talk()
{
System.out.println("我是："+name+"，今年："+age+"岁");
}
}
./ch09/���渚�9-10/浠ｇ��9-10.java
class Person
{
private String name ;
private int age ;
public Person(String n,int a)
{
name = n ;
age = a ;
System.out.println("public Person(String n,int a)") ;
}
public String talk()
{
return "我是："+name+"，今年："+age+"岁" ;
}
}
public class TestConstruct1
{
public static void main(String[] args)
{
Person p = new Person("张三",25) ;
System.out.println(p.talk()) ;
}
}
./ch09/���渚�9-11/浠ｇ��9-11.java
class Person
{
private String name ;
private int age ;
public Person(String n,int a)
{
name = n ;
age = a ;
System.out.println("public Person(String n,int a)") ;
}
public String talk()
{
return "我是："+name+"，今年："+age+"岁" ;
}
}
public class TestConstruct2
{
public static void main(String[] args)
{
Person p = new Person() ;
System.out.println(p.talk()) ;
}
}
./ch09/���渚�9-12/浠ｇ��9-12.java
class Person
{
private String name ;
private int age ;
public Person()
{}
public Person(String n,int a)
{
name = n ;
age = a ;
System.out.println("public Person(String n,int a)") ;
}
public String talk()
{
return "我是："+name+"，今年："+age+"岁" ;
}
}
public class TestConstruct2
{
public static void main(String[] args)
{
Person p = new Person() ;
System.out.println(p.talk()) ;
}
}
./ch09/���渚�9-13/浠ｇ��9-13.java
public class TestSingleDemo1
{
private TestSingleDemo1()
{
System.out.println("private TestSingleDemo1 .") ;
}
public static void main(String[] args)
{
new TestSingleDemo1() ;
}
}
./ch09/���渚�9-14/浠ｇ��9-14.java
class Person
{
String name ;
// 在本类声明一Person对象p，注意此对象用final标记，表示不能再重新实例化
private static final Person p = new Person() ;
private Person()
{
name = "张三" ;
}
public static Person getP()
{
return p ;
}
}
public class TestSingleDemo2
{
public static void main(String[] args)
{
// 声明一Person类的对象
Person p = null ;
p = Person.getP() ;
System.out.println(p.name) ;
}
}
./ch09/���渚�9-15/浠ｇ��9-15.java
class Person
{
private String name ;
private int age ;
private void talk()
{
System.out.println("我是："+name+"，今年："+age+"岁");
}
public void say()
{
talk();
}
public void setName(String str)
{
name = str ;
}
public void setAge(int a)
{
if(a>0)
age = a ;
}
public String getName()
{
return name ;
}
public int getAge()
{
return age ;
}
}
public class TestPersonDemo5
{
public static void main(String[] args)
{
// 声明并实例化一Person对象p
Person p = new Person() ;
// 给p中的属性赋值
p.setName("张三") ;
// 在这里将p对象中的年龄属性赋值为-25岁
p.setAge(30) ;
// 调用Person类中的say()方法
p.say() ;
}
}
./ch09/���渚�9-2/浠ｇ��9-2.java
class colordefine
{
String color = "黑色";
void getMes()
{
System.out.println("定义类");
}
public static void main(String args[]) {
{
colordefine b = new colordefine();
System.out.println(b.color);
b.getMes();
}
}
}
./ch09/���渚�9-3/浠ｇ��9-3.java
// 下面这个范例说明了使用Person类的对象调用类中的属性与方法的过程
class TestPersonDemo
{
public static void main(String[] args)
{
Person p = new Person() ;
p.name = "张三" ;
p.age = 25 ;
p.talk();
}
}
./ch09/���渚�9-4/浠ｇ��9-4.java
public class TestEquals
{
public static void main(String[] args)
{
String str1 = new String("java") ;
String str2 = new String("java") ;
String str3 = str2 ;
if(str1==str2)
{
System.out.println("str1 == str2");
}
else
{
System.out.println("str1 != str2") ;
}
if(str2==str3)
{
System.out.println("str2 == str3");
}
else
{
System.out.println("str2 != str3") ;
}
}
}
./ch09/���渚�9-5/浠ｇ��9-5.java
public class TestEquals1
{
public static void main(String[] args)
{
String str1 = new String("java") ;
String str2 = new String("java") ;
String str3 = str2 ;
if(str1.equals(str2))
{
System.out.println("str1 equals str2");
}
else
{
System.out.println("str1 not equals str2") ;
}
if(str2.equals(str3))
{
System.out.println("str2 equals str3");
}
else
{
System.out.println("str2 note equals str3") ;
}
}
}
./ch09/���渚�9-6/浠ｇ��9-6.java
class Person
{
String name ;
int age ;
public Person()
{
}
public Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
public String talk()
{
return "我是："+this.name+"，今年："+this.age+"岁" ;
}
}
public class TestObjectArray
{
public static void main(String[] args)
{
Person p[] = {
new Person("张三",25),new Person("李四",30),new Person("王五",35)
} ;
for(int i=0;i<p.length;i++)
{
System.out.println(p[i].talk()) ;
}
}
}
./ch09/���渚�9-7/浠ｇ��9-7.java
public class Test {
static String a = "string-a";
static String b;
String c = "stirng-c";
String d;
static {
printStatic("before static");
b = "string-b";
printStatic("after static");
}
public static void printStatic(String title) {
System.out.println("---------" + title + "---------");
System.out.println("a = \"" + a + "\"");
System.out.println("b = \"" + b + "\"");
}
public Test() {
print("before constructor");
d = "string-d";
print("after constructor");
}
public void print(String title) {
System.out.println("---------" + title + "---------");
System.out.println("a = \"" + a + "\"");
System.out.println("b = \"" + b + "\"");
System.out.println("c = \"" + c + "\"");
System.out.println("d = \"" + d + "\"");
}
public static void main(String[] args) {
new Test();
}
}./ch09/���渚�9-8/浠ｇ��9-8.java
public class methoddemo {
int a = 12345679 , b =81;
public void times(int i, int j)
{
System.out.println(i*j);
}
public static void main(String args[])
{
methoddemo m = new methoddemo();
m.times(m.a, m.b);
}
}
./ch09/���渚�9-9/浠ｇ��9-9.java
class Person
{
public Person() // Person类的构造方法
{
System.out.println("public Person()") ;
}
}
public class TestConstruct
{
public static void main(String[] args)
{
Person p = new Person() ;
}
}
./ch09/璺����涓����/Xiti_9/src/Person.java
class Person
{
String name ;
int age ;
String like;
void talk()
{
System.out.println("我是："+name+"，今年："+age+"岁,"+ "喜欢："+ like);
}
}
./ch09/璺����涓����/Xiti_9/src/Xiti_9.java
// 下面这个范例说明了使用Person类的对象调用类中的属性与方法的过程
class Xiti_9
{
public static void main(String[] args)
{
Person p = new Person() ;
p.name = "张三" ;
p.age = 25 ;
p.like= "音乐和诗歌";
p.talk();
}
}
./ch10/���渚�10-1/浠ｇ��10-1.java
class Person
{
String name ;
int age ;
void talk()
{
System.out.println("我是："+name+"，今年："+age+"岁");
}
}
public class TestPersonDemo2
{
public static void main(String[] args)
{
// 声明并实例化一Person对象p
Person p = new Person() ;
// 给p中的属性赋值
p.name = "张三" ;
// 在这里将对象p的年龄属性赋值为-25岁
p.age = -25 ;
// 调用Person类中的talk()方法
p.talk() ;
}
}
./ch10/���渚�10-10/浠ｇ��10-10.java
class Person
{
String name ;
int age ;
public String talk()
{
return "我是："+this.name+"，今年："+this.age+"岁";
}
}
class Student extends Person
{
String school ;
public Student(String name,int age,String school)
{
// 分别为属性赋值
this.name = name ;
this.age = age ;
this.school = school ;
}
// 此处覆写Person中的talk()方法
public String talk()
{
return "我在"+this.school+"上学" ;
}
}
class TestOverDemo1
{
public static void main(String[] args)
{
Student s = new Student("张三",25,"北京") ;
// 此时调用的是子类中的talk()方法
System.out.println(s.talk()) ;
}
}
./ch10/���渚�10-11/浠ｇ��10-11.java
class Person
{
String name ;
int age ;
public String talk()
{
return "我是："+this.name+"，今年："+this.age+"岁";
}
}
class Student extends Person
{
String school ;
public Student(String name,int age,String school)
{
// 分别为属性赋值
this.name = name ;
this.age = age ;
this.school = school ;
}
// 此处覆写Person类中的talk()方法
public String talk()
{
return super.talk()+"，我在"+this.school+"上学" ;
}
}
class TestOverDemo2
{
public static void main(String[] args)
{
Student s = new Student("张三",25,"北京") ;
//此时调用的是子类中的talk()方法
System.out.println(s.talk()) ;
}
}
./ch10/���渚�10-12/浠ｇ��10-12.java
class Person
{
public void fun1()
{
System.out.println("1.Person{fun1()}") ;
}
public void fun2()
{
System.out.println("2.Person{fun2()}") ;
}
}
// Student类扩展自Person类，也就继承了Person类中的fun1()、fun2()方法
class Student extends Person
{
// 在这里覆写了Person类中的fun1()方法
public void fun1()
{
System.out.println("3.Student{fun1()}") ;
}
public void fun3()
{
System.out.println("4.Studen{fun3()}") ;
}
}
class TestJavaDemo1
{
public static void main(String[] args)
{
// 此处，父类对象由子类实例化
Person p = new Student() ;
// 调用fun1()方法，观察此处调用的是哪个类里的fun1()方法
p.fun1() ;
p.fun2() ;
}
}
./ch10/���渚�10-13/浠ｇ��10-13.java
class Person
{
public void fun1()
{
System.out.println("1.Person{fun1()}") ;
}
public void fun2()
{
System.out.println("2.Person{fun2()}") ;
}
}
// Student类继承Person类，也就继承了Person类的fun1()、fun2()方法
class Student extends Person
{
// 在这里覆写了Person类中的fun1()方法
public void fun1()
{
System.out.println("3.Student{fun1()}") ;
}
public void fun3()
{
System.out.println("4.Studen{fun3()}") ;
}
}
class TestJavaDemo2
{
public static void main(String[] args)
{
// 此处，父类对象由自身实例化
Person p = new Person() ;
// 将p对象向下转型
Student s = (Student)p ;
p.fun1() ;
p.fun2() ;
}
}
./ch10/���渚�10-2/浠ｇ��10-2.java
class Person
{
private String name ;
private int age ;
void talk()
{
System.out.println("我是："+name+"，今年："+age+"岁");
}
}
public class TestPersonDemo3_1
{
public static void main(String[] args)
{
// 声明并实例化一Person对象p
Person p = new Person() ;
// 给p中的属性赋值
p.name = "张三" ;
// 在这里将p对象中的年龄赋值为-25岁
p.age = -25 ;
// 调用Person类中的talk()方法
p.talk() ;
}
}
./ch10/���渚�10-3/浠ｇ��10-3.java
class Person
{
private String name ;
private int age ;
void talk()
{
System.out.println("我是："+name+"，今年："+age+"岁");
}
public void setName(String str)
{
name = str ;
}
public void setAge(int a)
{
if(a>0)
age = a ;
}
public String getName()
{
return name ;
}
public int getAge()
{
return age ;
}
}
public class TestPersonDemo3-2
{
public static void main(String[] args)
{
// 声明并实例化一Person对象p
Person p = new Person() ;
// 给p中的属性赋值
p.setName("张三") ;
// 在这里将p对象中的年龄赋值为-25岁
p.setAge(-25) ;
// 调用Person类中的talk()方法
p.talk() ;
}
}
./ch10/���渚�10-4/浠ｇ��10-4.java
class Person
{
private String name ;
private int age ;
private void talk()
{
System.out.println("我是："+name+"，今年："+age+"岁");
}
public void setName(String str)
{
name = str ;
}
public void setAge(int a)
{
if(a>0)
age = a ;
}
public String getName()
{
return name ;
}
public int getAge()
{
return age ;
}
}
public class TestPersonDemo4
{
public static void main(String[] args)
{
// 声明并实例化一Person对象p
Person p = new Person() ;
// 给p中的属性赋值
p.setName("张三") ;
// 在这里将p对象中的年龄赋值为-25岁
p.setAge(-25) ;
// 调用Person类中的talk()方法
p.talk() ;
}
}
./ch10/���渚�10-5/浠ｇ��10-5.java
class Person
{
String name ;
int age ;
}
class Student extends Person
{
String school ;
}
public class TestPersonStudentDemo
{
public static void main(String[] args)
{
Student s = new Student() ;
// 访问Person类中的name属性
s.name = "张三" ;
// 访问Person类中的age属性
s.age = 25 ;
// 访问Student类中的school属性
s.school = "北京" ;
System.out.println("姓名："+s.name+"，年龄："+s.age+"，学校："+s.school) ;
}
}
./ch10/���渚�10-6/浠ｇ��10-6.java
class Person
{
String name ;
int age ;
// 父类的构造方法
public Person()
{
System.out.println("1.public Person(){}") ;
}
}
class Student extends Person
{
String school ;
// 子类的构造方法
public Student()
{
System.out.println("2.public Student(){}");
}
}
public class TestPersonStudentDemo1
{
public static void main(String[] args)
{
Student s = new Student() ;
}
}
./ch10/���渚�10-7/浠ｇ��10-7.java
class Person
{
String name ;
int age ;
// 父类的构造方法
public Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
}
class Student extends Person
{
String school ;
// 子类的构造方法
public Student()
{
// 在这里用super调用父类中的构造方法
super("张三",25);
}
}
public class TestPersonStudentDemo2
{
public static void main(String[] args)
{
Student s = new Student() ;
// 为Student类中的school赋值
s.school = "北京" ;
System.out.println("姓名："+s.name+"，年龄："+s.age+"，学校："+s.school) ;
}
}
./ch10/���渚�10-8/浠ｇ��10-8.java
class Person
{
String name ;
int age ;
// 父类的构造方法
public Person()
{
}
public String talk()
{
return "我是："+this.name+"，今年："+this.age+"岁" ;
}
}
class Student extends Person
{
String school ;
// 子类的构造方法
public Student(String name,int age,String school)
{
// 在这里用super调用父类中的属性
super.name = name ;
super.age = age ;
// 调用父类中的talk()方法
System.out.print(super.talk());
// 调用本类中的school属性
this.school = school ;
}
}
public class TestPersonStudentDemo3
{
public static void main(String[] args)
{
Student s = new Student("张三",25,"北京") ;
System.out.println("，学校："+s.school) ;
}
}姓名：张三，年龄：25，学校：北京
./ch10/���渚�10-9/浠ｇ��10-9.java
class Person
{
// 在这里将属性封装
private String name ;
private int age ;
}
class Student extends Person
{
// 在这里访问父类中被封装的属性
public void setVar()
{
name = "张三" ;
age = 25 ;
}
}
class TestPersonStudentDemo4
{
public static void main(String[] args)
{
new Student().setVar() ;
}
}
./ch10/璺����涓����/Xiti_10.java
class Person
{
String name ;
int age ;
String like;
public String talk()
{
return "我是："+this.name+"，今年："+this.age+"岁";
}
}
class Student extends Person
{
String school ;
public Student(String name,int age,String like)
{
// 分别为属性赋值
this.name = name ;
this.age = age ;
this.like = like ;
}
// 此处覆写Person中的talk()方法
public String talk()
{
return "我喜欢"+this.like ;
}
}
class Xiti_10
{
public static void main(String[] args)
{
Student s = new Student("张三",25,"音乐") ;
// 此时调用的是子类中的talk()方法
System.out.println(s.talk()) ;
}
}
./ch11/���渚�11-1/浠ｇ��11-1.java
abstract class Person
{
String name ;
int age ;
String occupation ;
// 声明一抽象方法talk()
public abstract String talk() ;
}
// Student类继承自Person类
class Student extends Person
{
public Student(String name,int age,String occupation)
{
this.name = name ;
this.age = age ;
this.occupation = occupation ;
}
// 覆写talk()方法
public String talk()
{
return "学生――>姓名："+this.name+"，年龄："+this.age+"，职业："+this.occupation+"！" ;
}
}
// Worker类继承自Person类
class Worker extends Person
{
public Worker(String name,int age,String occupation)
{
this.name = name ;
this.age = age ;
this.occupation = occupation ;
}
// 覆写talk()方法
public String talk()
{
return "工人――>姓名："+this.name+"，年龄："+this.age+"，职业："+this.occupation+"！" ;
}
}
class TestAbstractDemo1
{
public static void main(String[] args)
{
Student s = new Student("张三",20,"学生") ;
Worker w = new Worker("李四",30,"工人") ;
System.out.println(s.talk()) ;
System.out.println(w.talk()) ;
}
}
./ch11/���渚�11-2/浠ｇ��11-2.java
abstract class Person
{
String name ;
int age ;
String occupation ;
public Person(String name,int age,String occupation)
{
this.name = name ;
this.age = age ;
this.occupation = occupation ;
}
public abstract String talk() ;
}
class Student extends Person
{
public Student(String name,int age,String occupation)
{
// 在这里必须明确调用抽象类中的构造方法
super(name,age,occupation);
}
public String talk() {
return "学生――>姓名："+this.name+"，年龄："+this.age+"，职业："+this.occupation+"！" ;
}
}
class TestAbstractDemo2
{
public static void main(String[] args)
{
Student s = new Student("张三",20,"学生") ;
System.out.println(s.talk()) ;
}
}
./ch11/���渚�11-3/浠ｇ��11-3.java
interface Person
{
String name = "张三";
int age = 25 ;
String occupation = "学生" ;
// 声明一抽象方法talk()
public abstract String talk() ;
}
// Student类实现自Person类
class Student implements Person
{
// 覆写talk()方法
public String talk()
{
return "学生――>姓名："+this.name+"，年龄："+this.age+"，职业："+this.occupation+"！" ;
}
}
class TestInterfaceDemo1
{
public static void main(String[] args)
{
Student s = new Student() ;
System.out.println(s.talk()) ;
}
}
./ch11/���渚�11-4/浠ｇ��11-4.java
interface A
{
int i = 10 ;
public void sayI() ;
}
interface E
{
int x = 40 ;
public void sayE() ;
}
// B同时继承了A、E两个接口
interface B extends A,E
{
int j = 20 ;
public void sayJ() ;
}
// C继承实现B接口，也就意味着要实现A、B、E三个接口的抽象方法
class C implements B
{
public void sayI()
{
System.out.println("i = "+i);
}
public void sayJ()
{
System.out.println("j = "+j) ;
}
public void sayE()
{
System.out.println("e = "+x);
}
}
class TestInterfaceDemo2
{
public static void main(String[] args)
{
C c = new C() ;
c.sayI() ;
c.sayJ() ;
}
}
./ch11/璺����涓����/Xiti_11.java
abstract class Person
{
String name ;
int age ;
String occupation ;
// 声明一抽象方法talk()
public abstract String talk() ;
}
// Official类继承自Person类
class Official extends Person
{
public Official(String name,int age,String occupation)
{
this.name = name ;
this.age = age ;
this.occupation = occupation ;
}
// 覆写talk()方法
public String talk()
{
return "干部――>姓名："+this.name+"，年龄："+this.age+"，职业："+this.occupation+"！" ;
}
}
// Worker类继承自Person类
class Worker extends Person
{
public Worker(String name,int age,String occupation)
{
this.name = name ;
this.age = age ;
this.occupation = occupation ;
}
// 覆写talk()方法
public String talk()
{
return "工人――>姓名："+this.name+"，年龄："+this.age+"，职业："+this.occupation+"！" ;
}
}
class Xiti_11
{
public static void main(String[] args)
{
Official s = new Official("李乐乐",20,"干部") ;
Worker w = new Worker("工作",30,"工人") ;
System.out.println(s.talk()) ;
System.out.println(w.talk()) ;
}
}
./ch12/���渚�12-14/浠ｇ��12-14.java
// 以下程序是关于方法的返回类型是整型的范例
public class TestJavafanhuizhengxing
{
public static void main(String args[])
{
int num;
num=star(7); // 输入7给star()，并以num接收返回的数值�
System.out.println(num+" stars printed");
}
public static int star(int n) // star() method
{
for(int i=1;i<=2*n;i++)
System.out.print("*"); // 输出2*n个星号
System.out.print("\n"); // 换行
return 2*n; // 返回整数2*n
}
}
./ch12/���渚�12-1/浠ｇ��12-1.java
class Person extends Object
{
String name = "张三";
int age = 25 ;
}
class TestToStringDemo1
{
public static void main(String[] args)
{
Person p = new Person() ;
System.out.println(p);
}
}
./ch12/���渚�12-10/浠ｇ��12-10.java
interface A
{
public void fun1() ;
}
class B
{
int i = 10 ;
class C implements A
{
public void fun1()
{
System.out.println(i) ;
}
}
public void get(A a)
{
a.fun1() ;
}
public void test()
{
this.get(new C()) ;
}
}
class TestNonameInner1
{
public static void main(String[] args)
{
B b = new B() ;
b.test() ;
}
}
./ch12/���渚�12-11/浠ｇ��12-11.java
interface A
{
public void fun1() ;
}
class B
{
int i = 10 ;
public void get(A a)
{
a.fun1() ;
}
public void test()
{
this.get(new A()
{
public void fun1()
{
System.out.println(i) ;
}
}
) ;
}
}
class TestNonameInner2
{
public static void main(String[] args)
{
B b = new B() ;
b.test() ;
}
}
./ch12/���渚�12-12/浠ｇ��12-12.java
class Person
{
private String name = "张三" ;
private int age = 25 ;
public String talk()
{
return "我是："+name+"，今年："+age+"岁" ;
}
}
public class TestNoName
{
public static void main(String[] args)
{
System.out.println(new Person().talk());
}
}
./ch12/���渚�12-13/浠ｇ��12-13.java
// 以下程序主要说明如何去声明并使用一个方法
public class TestJavashengming
{
public static void main(String args[])
{
star(); // 调用star() 方法
System.out.println("I Like Java !");
star(); // 调用star() 方法
}
public static void star() // star() 方法
{
for(int i=0;i<19;i++)
System.out.print("*"); // 输出19个星号
System.out.print("\n"); // 换行
}
}
./ch12/���渚�12-15/浠ｇ��12-15.java
// 以下的程序说明了方法的使用
public class TestJavafangfa
{
public static void main(String args[])
{
double num;
num=show_length(22,19); // 输入22与19两个参数到show_length()里
System.out.println("对角线长度 = "+num);
}
public static double show_length(int m, int n)
{
return Math.sqrt(m*m+n*n); // 返回对角线长度�
}
}
./ch12/���渚�12-16/浠ｇ��12-16.java
// 以下程序说明了方法的重载操作
public class TestJavareload
{
public static void main(String[] args)
{
int int_sum ;
double double_sum ;
int_sum = add(3,5) ; // 调用有两个参数的add方法
System.out.println("int_sum = add(3,5)的值是："+int_sum);
int_sum = add(3,5,6) ; // 调用有三个参数的add方法
System.out.println("int_sum = add(3,5,6)的值是："+int_sum);
double_sum = add(3.2,6.5); // 传入的数值为doule类型
System.out.println("double_sum = add(3.2,6.5)的值是："+double_sum);
}
public static int add(int x,int y)
{
return x+y ;
}
public static int add(int x,int y,int z)
{
return x+y+z ;
}
public static double add(double x,double y)
{
return x+y ;
}
}
./ch12/���渚�12-17/浠ｇ��12-17.java
// 一维数组作为参数来传递，这里的一维数组采用静态方式赋值
public class TestJavachuanshuzu
{
public static void main(String args[])
{
int score[]={7,3,8,19,6,22}; // 声明一个一维数组score
largest(score); // 将一维数组score传入largest() 方法中
}
public static void largest(int arr[])
{
int tmp=arr[0];
for(int i=0;i<arr.length;i++)
if(tmp<arr[i])
tmp=arr[i];
System.out.println("最大的数 = "+tmp);
}
}
./ch12/���渚�12-18/浠ｇ��12-18.java
// 以下程序说明了如何将一个二维数组作为参数传递到方法中
public class TestJavachuanerwei
{
public static void main(String args[])
{
int A[][] = {{51,38,22,12,34},{72,64,19,31}} ; // 定义一个二维数组A
print_mat(A);
}
public static void print_mat(int arr[][]) // 接收整数类型的二维数组
{
for(int i=0;i<arr.length;i++)
{
for(int j=0;j<arr[i].length;j++)
System.out.print(arr[i][j]+" "); // 输出数组值�
System.out.print("\n"); // 换行
}
}
}
./ch12/���渚�12-19/浠ｇ��12-19.java
// 以下的程序说明了方法中返回一个二维数组的实现过程
public class TestJavafanerwei
{
public static void main(String args[])
{
int A[][]={{51,38,82,12,34},{72,64,19,31}}; // 定义二维数组
int B[][]=new int[2][5];
B=add10(A); // 调用add10()，并把返回的值设给数组B
for(int i=0;i<B.length;i++) // 输出数组的内容
{
for(int j=0;j<B[i].length;j++)
System.out.print(B[i][j]+" ");
System.out.print("\n");
}
}
public static int[][] add10(int arr[][])
{
for(int i=0;i<arr.length;i++)
for(int j=0;j<arr[i].length;j++)
arr[i][j]+=10; // 将数组元素加10
return arr; // 返回二维数组
}
}
./ch12/���渚�12-2/浠ｇ��12-2.java
class Person extends Object
{
String name = "张三";
int age = 25 ;
// 覆写Object类中的toString()方法
public String toString()
{
return "我是："+this.name+"，今年："+this.age+"岁";
}
}
class TestToStringDemo2
{
public static void main(String[] args)
{
Person p = new Person() ;
System.out.println(p);
}
}
./ch12/���渚�12-20/浠ｇ��12-20.java
class Person
{
String name ;
int age ;
}
public class TestRefDemo1
{
public static void main(String[] args)
{
// 声明一对象p1，此对象的值为null，表示未实例化
Person p1 = null ;
// 声明一对象p2，此对象的值为null，表示未实例
Person p2 = null ;
// 实例化p1对象
p1 = new Person() ;
// 为p1对象中的属性赋值
p1.name = "张三" ;
p1.age = 25 ;
// 将p1的引用赋给p2
p2 = p1 ;
// 输出p2对象中的属性
System.out.println("姓名："+p2.name);
System.out.println("年龄："+p2.age);
p1 = null ;
}
}
./ch12/���渚�12-21/浠ｇ��12-21.java
class Change
{
int x = 0 ;
}
public class TestRefDemo2
{
public static void main(String[] args)
{
Change c = new Change() ;
c.x = 20 ;
fun(c) ;
System.out.println("x = "+c.x);
}
public static void fun(Change c1)
{
c1.x = 25 ;
}
}
./ch12/���渚�12-22/浠ｇ��12-22.java
class Person
{
private String name ;
private int age ;
public Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
}
class TestOverEquals1
{
public static void main(String[] args)
{
Person p1 = new Person("张三",25);
Person p2 = new Person("张三",25);
// 判断p1和p2的内容是否相等
System.out.println(p1.equals(p2)?"是同一个人！":"不是同一个人");
}
}
./ch12/���渚�12-23/浠ｇ��12-23.java
class Person
{
private String name ;
private int age ;
public Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
// 覆写父类（Object类）中的equals方法
public boolean equals(Object o)
{
boolean temp = true ;
// 声明一p1对象，此对象实际上就是当前调用equals方法的对象
Person p1 = this ;
// 判断Object类对象是否是Person的实例
if(o instanceof Person)
{
// 如果是Person类实例，则进行向下转型
Person p2 = (Person)o ;
// 调用String类中的equals方法
if(!(p1.name.equals(p2.name)&&p1.age==p2.age))
{
temp = false ;
}
}
else
{
// 如果不是Person类实例，则直接返回false
temp = false ;
}
return temp ;
}
}
class TestOverEquals2
{
public static void main(String[] args)
{
Person t_p1 = new Person("张三",25);
Person t_p2 = new Person("张三",25);
// 判断p1和p2的内容是否相等
System.out.println(t_p1.equals(t_p2)?"是同一个人！":"不是同一个人");
}
}
./ch12/���渚�12-24/浠ｇ��12-24.java
interface Person
{
public void fun1() ;
}
class Student implements Person
{
public void fun1()
{
System.out.println("Student fun1()");
}
}
class TestInterfaceObject
{
public static void main(String[] args)
{
Person p = new Student() ;
p.fun1() ;
}
}
./ch12/���渚�12-25/浠ｇ��12-25.java
interface Usb
{
public void start() ;
public void stop() ;
}
class MoveDisk implements Usb
{
public void start()
{
System.out.println("MoveDisk start...") ;
}
public void stop()
{
System.out.println("MoveDisk stop...") ;
}
}
class Mp3 implements Usb
{
public void start()
{
System.out.println("Mp3 start...") ;
}
public void stop()
{
System.out.println("Mp3 stop...") ;
}
}
class Computer
{
public void work(Usb u)
{
u.start() ;
u.stop() ;
}
}
class TestInterface
{
public static void main(String[] args)
{
new Computer().work(new MoveDisk()) ;
new Computer().work(new Mp3()) ;
}
}
./ch12/���渚�12-26/浠ｇ��12-26.java
class Person
{
private String name ;
private int age ;
public Person(String name,int age)
{
name = name ;
age = age ;
}
}
./ch12/���渚�12-27/浠ｇ��12-27.java
class Person-1
{
private String name ;
private int age ;
public Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
}
./ch12/���渚�12-28/浠ｇ��12-28.java
class Person
{
private String name ;
private int age ;
public Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
public String talk()
{
return "我是："+name+"，今年："+age+"岁" ;
}
}
public class TestJavaThis
{
public static void main(String[] args)
{
Person p = new Person("张三",25) ;
System.out.println(p.talk()) ;
}
}
./ch12/���渚�12-29/浠ｇ��12-29.java
class Person
{
String name ;
int age ;
Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
boolean compare(Person p)
{
if(this.name.equals(p.name)&&this.age==p.age)
{
return true ;
}
else
{
return false ;
}
}
}
public class TestCompare
{
public static void main(String[] args)
{
Person p1 = new Person("张三",30);
Person p2 = new Person("张三",30);
System.out.println(p1.compare(p2)?"相等,是同一人!":"不相等,不是同一人!");
}
}
./ch12/���渚�12-3/浠ｇ��12-3.java
class Outer
{
int score = 95;
void inst()
{
Inner in = new Inner();
in.display();
}
class Inner
{
void display()
{
System.out.println("成绩: score = " + score);
}
}
}
public class InnerClassDemo
{
public static void main(String[] args)
{
Outer outer = new Outer();
outer.inst();
}
}
./ch12/���渚�12-30/浠ｇ��12-30.java
class Person
{
String name ;
int age ;
public Person()
{
System.out.println("1. public Person()");
}
public Person(String name,int age)
{
// 调用本类中无参构造方法
this() ;
this.name = name ;
this.age = age ;
System.out.println("2. public Person(String name,int age)");
}
}
public class TestJavaThis1
{
public static void main(String[] args)
{
new Person("张三",25) ;
}
}
./ch12/���渚�12-31/浠ｇ��12-31.java
class Person
{
String name ;
String city ;
int age ;
public Person(String name, String city, int age)
{
this.name = name ;
this.city = city ;
this.age = age ;
}
public String talk()
{
return "我是："+this.name+"，今年："+this.age+"岁，来自："+this.city;
}
}
public class TestStaticDemo1
{
public static void main(String[] args)
{
Person p1 = new Person("张三","中国",25) ;
Person p2 = new Person("李四","中国",30) ;
Person p3 = new Person("王五","中国",35) ;
System.out.println(p1.talk()) ;
System.out.println(p2.talk()) ;
System.out.println(p3.talk()) ;
}
}
./ch12/���渚�12-32/浠ｇ��12-32.java
class Person
{
String name ;
static String city = "中国";
int age ;
public Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
public String talk()
{
return "我是："+this.name+"，今年："+this.age+"岁，来自："+city;
}
}
public class TestStaticDemo2
{
public static void main(String[] args)
{
Person p1 = new Person("张三",25) ;
Person p2 = new Person("李四",30) ;
Person p3 = new Person("王五",35) ;
System.out.println("修改之前信息："+p1.talk()) ;
System.out.println("修改之前信息："+p2.talk()) ;
System.out.println("修改之前信息："+p3.talk()) ;
System.out.println(" ************* 修改之后信息 **************");
// 修改后的信息
p1.city = "美国" ;
System.out.println("修改之后信息："+p1.talk()) ;
System.out.println("修改之后信息："+p2.talk()) ;
System.out.println("修改之后信息："+p3.talk()) ;
}
}
./ch12/���渚�12-33/浠ｇ��12-33.java
class Person
{
String name ;
private static String city = "中国";
int age ;
public Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
public String talk()
{
return "我是："+this.name+"，今年："+this.age+"岁，来自："+city;
}
public static void setCity(String c)
{
city = c ;
}
}
public class TestStaticDemo3
{
public static void main(String[] args)
{
Person p1 = new Person("张三",25) ;
Person p2 = new Person("李四",30) ;
Person p3 = new Person("王五",35) ;
System.out.println("修改之前信息："+p1.talk()) ;
System.out.println("修改之前信息："+p2.talk()) ;
System.out.println("修改之前信息："+p3.talk()) ;
System.out.println(" **************修改之后信息**************");
// 修改后的信息
Person.setCity("美国") ;
System.out.println("修改之后信息："+p1.talk()) ;
System.out.println("修改之后信息："+p2.talk()) ;
System.out.println("修改之后信息："+p3.talk()) ;
}
}
./ch12/���渚�12-34/浠ｇ��12-34.java
public class TestMain
{
/*
public：表示公共方法
static：表示此方法为一静态方法，可以由类名直接调用
void：表示此方法无返回值
main：系统定义的方法名称
String args[]：接收运行时参数
*/
public static void main(String[] args)
{
// 取得输入参数的长度
int j = args.length ;
if(j!=2)
{
System.out.println("输入参数个数有错误！") ;
// 退出程序
System.exit(1) ;
}
for (int i=0;i<args.length ;i++ )
{
System.out.println(args[i]) ;
}
}
}
./ch12/���渚�12-35/浠ｇ��12-35.java
class Person
{
public Person()
{
System.out.println("1.public Person()");
}
// 此段代码会首先被执行
static
{
System.out.println("2.Person类的静态代码块被调用！");
}
}
public class TestStaticDemo5 {
// 运行本程序时，静态代码块会被自动执行
static
{
System.out.println("3.TestStaticDemo5类的静态代码块被调用！");
}
public static void main(String[] args) {
System.out.println("4.程序开始执行！");
// 产生两个实例化对象
new Person() ;
new Person() ;
}
}
./ch12/���渚�12-36/浠ｇ��12-36.java
class TestFinalDemo1
{
public static void main(String[] args)
{
final int i = 10 ;
// 修改用final修饰的变量i
i++ ;
}
}
./ch12/���渚�12-37/浠ｇ��12-37.java
final class Person
{
}
class Student extends Person
{
}
./ch12/���渚�12-38/浠ｇ��12-38.java
class Person
{
// 此方法声明为final不能被子类覆写
final public String talk()
{
return "Person：talk()" ;
}
}
class Student extends Person
{
public String talk()
{
return "Student：talk()" ;
}
}
./ch12/���渚�12-39/浠ｇ��12-39.java
class Person
{
public void fun1()
{
System.out.println("1.Person{fun1()}") ;
}
public void fun2()
{
System.out.println("2.Person{fun2()}") ;
}
}
// Student类继承自Person类，也就继承了Person类中的fun1()、fun2()方法
class Student extends Person
{
// 在这里覆写了Person类中的fun1()方法
public void fun1()
{
System.out.println("3.Student{fun1()}") ;
}
public void fun3()
{
System.out.println("4.Studen{fun3()}") ;
}
}
class TestJavaDemo3
{
public static void main(String[] args)
{
// 声明一父类对象并通过子类对象对其进行实例化
Person p = new Student() ;
// 判断对象p是否是Student类的实例
if(p instanceof Student)
{
// 将Person类的对象p转型为Student类型
Student s = (Student)p ;
s.fun1() ;
}
else
{
p.fun2() ;
}
}
}
./ch12/���渚�12-4/浠ｇ��12-4.java
class Outer
{
int score = 95;
void inst()
{
Inner in = new Inner();
in.display();
}
public class Inner
{
void display()
{
// 在内部类中声明一name属性
String name = "张三" ;
System.out.println("成绩: score = " + score);
}
}
public void print()
{
// 在此调用内部类的name属性
System.out.println("姓名："+name) ;
}
}
public class InnerClassDemo1
{
public static void main(String[] args)
{
Outer outer = new Outer();
outer.inst();
}
}
./ch12/���渚�12-5/浠ｇ��12-5.java
class Outer
{
int score = 95;
void inst()
{
Inner in = new Inner();
in.display();
}
// 这里用static声明内部类
static class Inner
{
void display()
{
System.out.println("成绩: score = " + score);
}
}
}
public class InnerClassDemo2
{
public static void main(String[] args)
{
Outer outer = new Outer();
outer.inst();
}
}
./ch12/���渚�12-6/浠ｇ��12-6.java
class Outer
{
int score = 95;
void inst()
{
Inner in = new Inner();
in.display();
}
public class Inner
{
void display()
{
System.out.println("成绩: score = " + score);
}
}
}
public class InnerClassDemo3
{
public static void main(String[] args)
{
Outer outer = new Outer();
Outer.Inner inner = outer.new Inner();
inner.display() ;
}
}
./ch12/���渚�12-7/浠ｇ��12-7.java
class Outer
{
int score = 95;
void inst()
{
class Inner
{
void display()
{
System.out.println("成绩: score = " + score);
}
}
Inner in = new Inner();
in.display();
}
}
public class InnerClassDemo4
{
public static void main(String[] args)
{
Outer outer = new Outer();
outer.inst() ;
}
}
./ch12/���渚�12-8/浠ｇ��12-8.java
class Outer
{
int score = 95;
void inst(final int s)
{
int temp = 20 ;
class Inner
{
void display()
{
System.out.println("成绩: score = " + (score+s+temp));
}
}
Inner in = new Inner();
in.display();
}
}
public class InnerClassDemo5
{
public static void main(String[] args)
{
Outer outer = new Outer();
outer.inst(5) ;
}
}
./ch12/���渚�12-9/浠ｇ��12-9.java
class Outer
{
int score = 95;
void inst(final int s)
{
final int temp = 20 ;
class Inner
{
void display()
{
System.out.println("成绩: score = " + (score+s+temp));
}
}
Inner in = new Inner();
in.display();
}
}
public class InnerClassDemo5
{
public static void main(String[] args)
{
Outer outer = new Outer();
outer.inst(5) ;
}
}
./ch12/璺����涓����/Xiti_12.java
class Person
{
private String name = "张亮亮" ;
private int age = 20 ;
private String sex = "男";
public String talk()
{
return "我是："+name+"，今年："+age+"岁，"+ "我是"+ sex +"性。" ;
}
}
public class Xiti_12
{
public static void main(String[] args)
{
System.out.println(new Person().talk());
}
}
./ch13/���渚�13-1/浠ｇ��13-1.java
class IntegerDemo
{
public static void main(String[] args)
{
String a = "123" ;
int i = Integer.parseInt(a) ;
i++;
System.out.println(i);
}
}
./ch13/���渚�13-2/浠ｇ��13-2.java
import java.util.*;
public class SystemInfo
{
public static void main(String[] args)
{
Properties sp=System.getProperties();
Enumeration e=sp.propertyNames();
while(e.hasMoreElements())
{
String key=(String)e.nextElement();
System.out.println(key+" = "+sp.getProperty(key));
}
}
}
./ch13/���渚�13-3/浠ｇ��13-3.java
public class RuntimeDemo
{
public static void main(String[] args)
{
Runtime run = Runtime.getRuntime() ;
try
{
run.exec("notepad.exe") ;
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
./ch13/���渚�13-4/浠ｇ��13-4.java
import java.util.*;
public class CalendarDemo
{
public static void main(String[] args)
{
Calendar c1=Calendar.getInstance();
// 下面打印当前时间
System.out.println(c1.get(c1.YEAR)+"年"+(c1.get(c1.MONTH)+1)+
"月"+c1.get(c1.DAY_OF_MONTH)+"日"+c1.get(c1.HOUR)+
":"+c1.get(c1.MINUTE)+":"+c1.get(c1.SECOND));
// 增加天数为230
c1.add(c1.DAY_OF_YEAR,230);
// 下面打印的是230天后的时间
System.out.println(c1.get(c1.YEAR)+"年"+(c1.get(c1.MONTH)+1)+
"月"+c1.get(c1.DAY_OF_MONTH)+"日"+c1.get(c1.HOUR)+
":"+c1.get(c1.MINUTE)+":"+c1.get(c1.SECOND));
}
}
./ch13/���渚�13-5/浠ｇ��13-5.java
import java.text.* ;
import java.util.Date;
public class DateFormatDemo
{
public static void main(String[] args)
{
SimpleDateFormat sp1 =
new SimpleDateFormat("yyyy-MM-dd hh:mm:ss") ;
SimpleDateFormat sp2 =
new SimpleDateFormat("yyyy年MM月dd日 hh点mm分ss秒") ;
try
{
Date d = sp1.parse("2005-8-11 18:30:38") ;
System.out.println(sp2.format(d)) ;
}
catch (ParseException e)
{
e.printStackTrace();
}
}
}
./ch13/���渚�13-6/浠ｇ��13-6.java
import java.util.Random;
public class RandomDemo
{
public static void main(String[] args)
{
Random r = new Random() ;
for(int i=0;i<5;i++)
{
System.out.print(r.nextInt(100)+"\t") ;
}
}
}
./ch13/���渚�13-7/浠ｇ��13-7.java
import java.util.* ;
class Person
{
private String name ;
private int age ;
Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
public String toString()
{
return "姓名："+this.name+"，年龄："+this.age ;
}
}
public class HashCodeDemo
{
public static void main(String args[])
{
HashMap hm = new HashMap() ;
hm.put(new Person("张三",20),"张三") ;
System.out.println(hm.get(new Person("张三",20))) ;
}
}
./ch13/���渚�13-8/浠ｇ��13-8.java
class Employee implements Cloneable
{
private String name;
private int age;
public Employee(String name, int age)
{
this.name = name;
this.age = age;
}
public Object clone() throws CloneNotSupportedException
{
return super.clone();
}
public String toString()
{
return "姓名：" + this.name + "，年龄：" + this.age;
}
public int getAge()
{
return age;
}
public void setAge(int age)
{
this.age = age;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
}
public class CloneDemo
{
public static void main(String args[])
{
Employee e1 = new Employee("张三", 21);
Employee e2 = null;
try {
e2 = (Employee) e1.clone();
} catch (CloneNotSupportedException e) {
e.printStackTrace();
}
e2.setName("李四");
e2.setAge(30);
System.out.println("两个对象的内存地址比较：" + (e1 == e2));
System.out.println(e1);
System.out.println(e2);
}
}
./ch13/璺����涓����/Xiti_13.java
public class Xiti_13
{
public static void main(String[] args)
{
Runtime run = Runtime.getRuntime() ;
try
{
run.exec("calc.exe") ;
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
./ch14/���渚�14-1/浠ｇ��14-1.java
package demo.java ;
class Person
{
public String talk()
return "Person ―― >> talk()" ;
}
}
class TestPackage1
{
public static void main(String[] args)
{
System.out.println(new Person().talk()) ;
}
}
./ch14/���渚�14-2/浠ｇ��14-2.java
package demo.java.a ;
public class Person
{
public String talk()
{
return "Person ―― >> talk()" ;
}
}
./ch14/���渚�14-3/浠ｇ��14-3.java
package demo.java.b ;
import demo.java.a.Person ;
class TestPackage2
{
public static void main(String[] args)
{
System.out.println(new Person().talk()) ;
}
}
./ch14/���渚�14-4/浠ｇ��14-4.java
package demo.java.b ;
class TestPackage3
{
public static void main(String[] args)
{
System.out.println(new demo.java.a.Person().talk()) ;
}
}
./ch14/���渚�14-5/浠ｇ��14-5.java
package demo.java.a ;
public class Person
{
protected String name ;
public String talk()
{
return "Person ―― >> talk()" ;
}
}
./ch14/���渚�14-6/浠ｇ��14-6.java
package demo.java.b ;
import demo.java.a.* ;
public class Student extends Person
{
public Student(String name)
{
this.name = name ;
}
public String talk()
{
return "Person ―― >> talk() ， "+this.name ;
}
}
./ch14/���渚�14-7/浠ｇ��14-7.java
package demo.java.c ;
import demo.java.b.* ;
class TestPackage4
{
public static void main(String[] args)
{
Student s = new Student("javafans") ;
s.name = "javafans" ;
System.out.println(s.talk()) ;
}
}
./ch14/璺����涓����/Xiti_14/src/bao_private/Xiti_14.java
package bao_private ;
import bao_public.Person ;
class Xiti_14
{
public static void main(String[] args)
{
System.out.println(new Person().talk()) ;
}
}
./ch14/璺����涓����/Xiti_14/src/bao_public/Person.java
package bao_public ;
public class Person
{
public String talk()
{
return "Person ―― >> talk()" ;
}
}
./ch15/���渚�15-1_/浠ｇ��15-1.java
public class TestException_1
{
public static void main(String args[])
{
int arr[]=new int[5]; // 容许5个元素
arr[10]=7; // 下标值超出所容许的范围
System.out.println("end of main() method !!");
}
}
./ch15/���渚�15-2/浠ｇ��15-2.java
public class TestException_2
{
public static void main(String args[])
{
try // 检查这个程序块的代码
{
int arr[]=new int[5];
arr[10]=7; // 在这里会出现异常
}
catch(ArrayIndexOutOfBoundsException e)
{
System.out.println("数组超出绑定范围！");
}
finally // 这个块的程序代码一定会执行
{
System.out.println("这里一定会被执行！");
}
System.out.println("main()方法结束！");
}
}
./ch15/���渚�15-3/浠ｇ��15-3.java
public class TestException_3
{
public static void main(String args[])
{
try
{
int arr[]=new int[5];
arr[10]=7;
}
catch(ArrayIndexOutOfBoundsException e){
System.out.println("数组超出绑定范围！");
System.out.println("异常："+e); // 显示异常对象e的内容�
}
System.out.println("main()方法结束！");
}
}
./ch15/���渚�15-4/浠ｇ��15-4.java
public class TestException_4
{
public static void main(String args[])
{
int a=4,b=0;
try
{
if(b==0)
throw new ArithmeticException("一个算术异常"); // 抛出异常
else
System.out.println(a+"/"+b+"="+a/b);// 若抛出异常，则执行此行
}
catch(ArithmeticException e)
{
System.out.println("抛出异常为："+e);
}
}
}
./ch15/���渚�15-5/浠ｇ��15-5.java
class Test
{
// throws 在指定方法中不处理异常，在调用此方法的地方处理
void add(int a,int b) throws Exception
{
int c;
c=a/b;
System.out.println(a+"/"+b+"="+c);
}
}
public class TestException_5
{
public static void main(String args[])
{
Test t = new Test() ;
t.add(4,0);
}
}
./ch15/���渚�15-6/浠ｇ��15-6.java
class DefaultException extends Exception
{
public DefaultException(String msg)
{
// 调用Exception类的构造方法，存入异常信息
super(msg) ;
}
}
public class TestException_6
{
public static void main(String[] args)
{
try
{
// 在这里用throw直接抛出一个DefaultException类的实例对象
throw new DefaultException("自定义异常！") ;
}
catch(Exception e)
{
System.out.println(e) ;
}
}
}
./ch15/璺����涓����/Xiti_15.java
public class Xiti_15
{
public static void main(String args[])
{
try // 检查这个程序块的代码
{
int x = 6;
int y = 0;
int z;
z = x/y; // 在这里会出现异常
}
catch(java.lang.ArithmeticException e)
{
System.out.println("被除数为0！");
}
finally // 这个块的程序代码一定会执行
{
System.out.println("程序出错！");
}
}
}
./ch16/���渚�16-1/浠ｇ��16-1.java
import java.util.*;
public class ArrayListDemo
{
public static void main(String args[])
{
// 创建一个ArrarList对象
ArrayList al = new ArrayList();
System.out.println("a1 的初始化大小：" + al.size());
// 向ArrayList对象中添加新内容
al.add("C"); // 0位置
al.add("A"); // 1位置
al.add("E"); // 2位置
al.add("B"); // 3位置
al.add("D"); // 4位置
al.add("F"); // 5位置
// 把A2加在ArrayList对象的第2个位置
al.add(1, "A2"); // 加入之后的内容：C A2 A E B D F
System.out.println("a1 加入元素之后的大小：" + al.size());
// 显示Arraylist数据
System.out.println("a1 的内容: " + al);
// 从ArrayList中移除数据
al.remove("F");
al.remove(2); // C A2 E B D
System.out.println("a1 删除元素之后的大小: " + al.size());
System.out.println("a1 的内容: " + al);
}
}
./ch16/���渚�16-10/浠ｇ��16-10.java
import java.util.* ;
class Employee implements Comparator
{
public int compare(Object a, Object b)
{
int k;
String aStr, bStr;
aStr = (String) a;
bStr = (String) b;
k = aStr.compareTo(bStr);
if(k==0)
return aStr.compareTo(bStr);
else
return k;
}
}
public class TreeMapDemo2
{
public static void main(String args[])
{
// 创建一个TreeMap对象
TreeMap tm = new TreeMap(new Employee());
// 向Map对象中插入元素
tm.put("Z、张三", new Double(3534.34));
tm.put("L、李四", new Double(126.22));
tm.put("W、王五", new Double(1578.40));
tm.put("Z、赵六", new Double(99.62));
tm.put("S、孙七", new Double(-29.08));
Set set = tm.entrySet();
Iterator itr = set.iterator();
while(itr.hasNext())
{
Map.Entry me = (Map.Entry)itr.next();
System.out.print(me.getKey() + ": ");
System.out.println(me.getValue());
}
System.out.println();
double balance = ((Double)tm.get("Z、张三")).doubleValue();
tm.put("Z、张三", new Double(balance + 2000));
System.out.println("张三最新的资金数为： " + tm.get("Z、张三"));
}
}
./ch16/���渚�16-11/浠ｇ��16-11.java
import java.util.* ;
public class VectorDemo
{
public static void main(String[] args)
{
Vector v = new Vector() ;
v.add("A") ;
v.add("B") ;
v.add("C") ;
v.add("D") ;
v.add("E") ;
v.add("F") ;
Enumeration e = v.elements() ;
while(e.hasMoreElements())
{
System.out.print(e.nextElement()+"\t") ;
}
}
}
./ch16/���渚�16-12/浠ｇ��16-12.java
import java.util.* ;
public class StackDemo
{
static void showpush(Stack st, int a)
{
st.push(new Integer(a));
System.out.println("入栈(" + a + ")");
System.out.println("Stack: " + st);
}
static void showpop(Stack st)
{
System.out.print("出栈 -> ");
Integer a = (Integer) st.pop();
System.out.println(a);
System.out.println("Stack: " + st);
}
public static void main(String args[])
{
Stack st = new Stack();
System.out.println("Stack: " + st);
showpush(st, 42);
showpush(st, 66);
showpush(st, 99);
showpop(st);
showpop(st);
showpop(st);
//出栈的时候会有一个EmptyStackException的异常，需要进行异常处理
try {
showpop(st);
} catch (EmptyStackException e) {
System.out.println("出现异常：栈中内容为空");
}
}
}
./ch16/���渚�16-13/浠ｇ��16-13.java
import java.util.* ;
public class HashtableDemo
{
public static void main(String[] args)
{
Hashtable numbers = new Hashtable();
numbers.put("one", new Integer(1));
numbers.put("two", new Integer(2));
numbers.put("three", new Integer(3));
Integer n = (Integer) numbers.get("two");
if (n != null)
{
System.out.println("two = " + n);
}
}
}
./ch16/���渚�16-14/浠ｇ��16-14.java
import java.util.*;
public class PropertiesDemo
{
public static void main(String args[])
{
Properties capitals = new Properties();
Set states;
String str;
capitals.put("中国", "北京");
capitals.put("俄罗斯", "莫斯科");
capitals.put("日本", "东京");
capitals.put("法国", "巴黎");
capitals.put("英国", "伦敦");
// 返回包含映射中项的集合
states = capitals.keySet();
Iterator itr = states.iterator();
while (itr.hasNext())
{
str = (String) itr.next();
System.out.println("国家：" + str + " ，首都： " + capitals.getProperty(str) + ".");
}
System.out.println();
// 查找列表，如果没有则显示为“没发现”
str = capitals.getProperty("美国", "没有发现");
System.out.println("美国的首都：" + str + ".");
}
}
./ch16/���渚�16-15/浠ｇ��16-15.java
import java.io.* ;
import java.util.* ;
public class PropertiesFile
{
public static void main(String[] args)
{
Properties settings = new Properties();
try {
settings.load(new FileInputStream("c:\\count.txt"));
} catch (Exception e) {
settings.setProperty("count", new Integer(0).toString());
}
int c = Integer.parseInt(settings.getProperty("count")) + 1;
System.out.println("这是本程序第" + c + "次被使用");
settings.put("count", new Integer(c).toString());
try {
settings.store(new FileOutputStream("c:\\count.txt"),
"PropertiesFile use it .");
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
./ch16/���渚�16-2/浠ｇ��16-2.java
import java.util.*;
public class ArrayListToArray
{
public static void main(String args[])
{
// 创建一ArrayList对象al
ArrayList al = new ArrayList();
// 向ArrayList中加入对象
al.add(new Integer(1));
al.add(new Integer(2));
al.add(new Integer(3));
al.add(new Integer(4));
System.out.println("ArrayList 中的内容 ： " + al);
// 得到对象数组
Object ia[] = al.toArray();
int sum = 0;
// 计算数组内容
for (int i = 0; i < ia.length; i++)
sum += ((Integer) ia[i]).intValue();
System.out.println("数组累加结果是： " + sum);
}
}
./ch16/���渚�16-3/浠ｇ��16-3.java
import java.util.*;
public class LinkedListDemo
{
public static void main(String args[])
{
// 创建LinkedList对象
LinkedList ll = new LinkedList();
// 加入元素到LinkedList中
ll.add("F");
ll.add("B");
ll.add("D");
ll.add("E");
ll.add("C");
// 在链表的最后一个位置加上数据
ll.addLast("Z");
// 在链表的第一个位置上加入数据
ll.addFirst("A");
// 在链表第二个元素的位置上加入数据
ll.add(1, "A2");
System.out.println("ll 最初的内容：" + ll);
// 从linkedlist中移除元素
ll.remove("F");
ll.remove(2);
System.out.println("从ll中移除内容之后：" + ll);
// 移除第一个和最后一个元素
ll.removeFirst();
ll.removeLast();
System.out.println("ll 移除第一个和最后一个元素之后的内容：" + ll);
// 取得并设置值
Object val = ll.get(2);
ll.set(2, (String) val + " Changed");
System.out.println("ll 被改变之后：" + ll);
}
}
./ch16/���渚�16-4/浠ｇ��16-4.java
import java.util.*;
public class HashSetDemo
{
public static void main(String args[])
{
// 创建HashSet对象
HashSet hs = new HashSet();
// 加入元素到HastSet中
hs.add("B");
hs.add("A");
hs.add("D");
hs.add("E");
hs.add("C");
hs.add("F");
System.out.println(hs);
}
}
./ch16/���渚�16-5/浠ｇ��16-5.java
import java.util.*;
public class TreeSetDemo
{
public static void main(String args[])
{
// 创建一TreeSet对象
TreeSet ts = new TreeSet();
// 加入元素到TreeSet中
ts.add("C");
ts.add("A");
ts.add("B");
ts.add("E");
ts.add("F");
ts.add("D");
System.out.println(ts);
}
}
./ch16/���渚�16-6/浠ｇ��16-6.java
import java.util.* ;
public class IteratorDemo
{
public static void main(String args[])
{
// 创建一个ArrayList数组
ArrayList al = new ArrayList();
// 加入元素到ArrayList中
al.add("C");
al.add("A");
al.add("E");
al.add("B");
al.add("D");
al.add("F");
// 使用iterator显示a1中的内容
System.out.print("a1 中原始内容是：");
Iterator itr = al.iterator();
while (itr.hasNext())
{
Object element = itr.next();
System.out.print(element + " ");
}
System.out.println();
// 在ListIterator中修改内容
ListIterator litr = al.listIterator();
while (litr.hasNext())
{
Object element = litr.next();
// 用set方法修改其内容
litr.set(element + "+");
}
System.out.print("a1 被修改之后的内容：");
itr = al.iterator();
while (itr.hasNext())
{
Object element = itr.next();
System.out.print(element + " ");
}
System.out.println();
// 下面是将列表中的内容反向输出
System.out.print("将列表反向输出：");
// hasPreviours由后向前输出
while (litr.hasPrevious())
{
Object element = litr.previous();
System.out.print(element + " ");
}
System.out.println();
}
}
./ch16/���渚�16-7/浠ｇ��16-7.java
import java.util.* ;
public class HashMapDemo
{
public static void main(String args[])
{
// 创建HashMap对象
HashMap hm = new HashMap();
// 加入元素到HashMap中
hm.put("John Doe", new Double(3434.34));
hm.put("Tom Smith", new Double(123.22));
hm.put("Jane Baker", new Double(1378.00));
hm.put("Todd Hall", new Double(99.22));
hm.put("Ralph Smith", new Double(-19.08));
// 返回包含映射中项的集合
Set set = hm.entrySet();
// 用Iterator得到HashMap中的内容
Iterator i = set.iterator();
// 显示元素
while (i.hasNext())
{
//Map.Entry可以操作映射的输入
Map.Entry me = (Map.Entry) i.next();
System.out.print(me.getKey() + ": ");
System.out.println(me.getValue());
}
System.out.println();
// 让John Doe中的值增加1000
double balance = ((Double) hm.get("John Doe")).doubleValue();
//用新的值替换掉旧的值
hm.put("John Doe", new Double(balance + 1000));
System.out.println("John Doe's 现在的资金：" + hm.get("John Doe"));
}
}
./ch16/���渚�16-8/浠ｇ��16-8.java
import java.util.* ;
public class TreeMapDemo
{
public static void main(String args[])
{
// 创建TreeMap对象
TreeMap tm = new TreeMap();
// 加入元素到TreeMap中
tm.put(new Integer(10000 - 2000), "张三");
tm.put(new Integer(10000 - 1500), "李四");
tm.put(new Integer(10000 - 2500), "王五");
tm.put(new Integer(10000 - 5000), "赵六");
Collection col = tm.values();
Iterator i = col.iterator();
System.out.println("按工资由高到低顺序输出：");
while (i.hasNext())
{
System.out.println(i.next());
}
}
}
./ch16/���渚�16-9/浠ｇ��16-9.java
import java.util.*;
class MyComp implements Comparator
{
public int compare(Object o1, Object o2)
{
String aStr, bStr;
aStr = (String)o1;
bStr = (String)o2;
return bStr.compareTo(aStr);
}
}
public class ComparatorDemo
{
public static void main(String args[])
{
// 创建一个TreeSet对象
TreeSet ts = new TreeSet(new MyComp());
// 向TreeSet对象中加入内容
ts.add("C");
ts.add("A");
ts.add("B");
ts.add("E");
ts.add("F");
ts.add("D");
// 得到Iterator的实例化对象
Iterator i = ts.iterator();
// 显示全部内容
while (i.hasNext())
{
Object element = i.next();
System.out.print(element + " ");
}
}
}
./ch16/璺����涓����/Xiti_16.java
import java.util.TreeSet;
public class Xiti_16
{
public static void main(String args[])
{
// 创建一TreeSet对象
TreeSet ts = new TreeSet();
// 加入元素到TreeSet中
ts.add("3");
ts.add("6");
ts.add("9");
ts.add("7");
ts.add("18");
ts.add("25");
System.out.println(ts);
}
}
./ch17/Meiju/org/lxh/enumdemo/demo00/Color.java
package org.lxh.enumdemo.demo00;
public class Color {
private String name;
public static final Color RED = new Color("红色");
public static final Color GREEN = new Color("绿色");
public static final Color BLUE = new Color("蓝色");
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
private Color(String name) {
this.setName(name);
}
public static Color getInstance(int i) {
if (i == 0) {
return RED;
}
if (i == 1) {
return GREEN;
}
if (i == 2) {
return BLUE;
}
return null;
}
}
./ch17/Meiju/org/lxh/enumdemo/demo00/TestColor.java
package org.lxh.enumdemo.demo00;
public class TestColor {
public static void main(String[] args) {
Color c = Color.getInstance(0) ;
System.out.println(c.getName()) ;
}
}
./ch17/Meiju/org/lxh/enumdemo/demo01/Color.java
package org.lxh.enumdemo.demo01;
import java.lang.*;
import java.util.*;
public enum Color {
RED{
public String getColor(){
return "红色";
}
},
GREEN{
public String getColor(){
return "绿色";
}
},
BLUE{
public String getColor(){
return "蓝色";
}
};
}
./ch17/Meiju/org/lxh/enumdemo/demo01/EnumMapDemo.java
package org.lxh.enumdemo.demo01;
import java.util.EnumMap;
import java.util.Map;
public class EnumMapDemo {
public static void main(String[] args) {
EnumMap<Color, String> eMap = new EnumMap<Color, String>(Color.class);
eMap.put(Color.RED, "红色");
eMap.put(Color.GREEN, "绿色");
eMap.put(Color.BLUE, "蓝色");
for (Map.Entry<Color, String> me : eMap.entrySet()) {
System.out.println(me.getKey() + " --> " + me.getValue()) ;
}
}
}
./ch17/Meiju/org/lxh/enumdemo/demo01/EnumSetDemo01.java
package org.lxh.enumdemo.demo01;
import java.util.EnumSet;
import java.util.Iterator;
public class EnumSetDemo01 {
public static void main(String[] args) {
EnumSet<Color> eSet = EnumSet.noneOf(Color.class); // 表示将全部的内容设置到集合
Iterator<Color> iter = eSet.iterator() ;
while(iter.hasNext()){
System.out.println(iter.next());
}
}
}
./ch17/Meiju/org/lxh/enumdemo/demo01/TestColor01.java
package org.lxh.enumdemo.demo01;
public class TestColor01 {
public static void main(String[] args) {
Color c = Color.RED ; // 得到红色
System.out.println(c) ;
}
}
./ch17/Meiju/org/lxh/enumdemo/demo01/TestColor03.java
package org.lxh.enumdemo.demo01;
public class TestColor03 {
public static void main(String[] args) {
switch (Color.RED) {
case RED: {
System.out.println("红色");
break;
}
case GREEN: {
System.out.println("绿色");
break;
}
case BLUE: {
System.out.println("蓝色");
break;
}
}
}
}
./ch17/Meiju/org/lxh/enumdemo/demo01/TestColor04.java
package org.lxh.enumdemo.demo01;
public class TestColor04 {
public static void main(String[] args) {
for (Color c : Color.values()) {
System.out.print(c + "、");
}
}
}
./ch17/Meiju/org/lxh/enumdemo/demo01/TestColor05.java
package org.lxh.enumdemo.demo01;
public class TestColor05 {
public static void main(String[] args) {
for (Color c : Color.values()) {
System.out.println(c.name() + " --> " + c.ordinal());
}
}
}
./ch17/Meiju/org/lxh/enumdemo/demo01/TestColor06.java
package org.lxh.enumdemo.demo01;
public class TestColor06 {
public static void main(String[] args) {
Color c = Color.valueOf(Color.class, "RED") ;
System.out.println(c) ;
}
}
./ch17/Meiju/org/lxh/enumdemo/demo02/Color.java
package org.lxh.enumdemo.demo02;
public enum Color implements Info { // 实现接口
RED {
public String getColor() {
return "红色";
}
},
GREEN {
public String getColor() {
return "绿色";
}
},
BLUE {
public String getColor(){
return "蓝色" ;
}
};
}
./ch17/Meiju/org/lxh/enumdemo/demo02/Info.java
package org.lxh.enumdemo.demo02;
public interface Info {
public String getColor() ;
}
./ch17/Meiju/org/lxh/enumdemo/demo02/TestColor.java
package org.lxh.enumdemo.demo02;
public class TestColor {
public static void main(String[] args) {
for (Color c : Color.values()) {
System.out.println(c.ordinal() + " --> " + c.name() + "："
+ c.getColor());
}
}
}
./ch17/Meiju/org/lxh/enumdemo/demo03/Color.java
package org.lxh.enumdemo.demo03;
public interface Color {
public static final int RED = 0;
public static final int GREEN = 1;
public static final int BLUE = 2;
}
./ch17/���渚�17-1/浠ｇ��17-1.java
public class Color {
private String name;
public static final Color RED = new Color("红色");
public static final Color GREEN = new Color("绿色");
public static final Color BLUE = new Color("蓝色");
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
private Color(String name) {
this.setName(name);
}
public static Color getInstance(int i) {
if (i == 0) {
return RED;
}
if (i == 1) {
return GREEN;
}
if (i == 2) {
return BLUE;
}
return null;
}
}
./ch17/���渚�17-10/浠ｇ��17-10.java
package org.lxh.enumdemo.demo04;
import java.util.EnumMap;
import java.util.Map;
public class EnumMapDemo {
public static void main(String[] args) {
EnumMap<Color, String> eMap = new EnumMap<Color, String>(Color.class);
eMap.put(Color.RED, "红色");
eMap.put(Color.GREEN, "绿色");
eMap.put(Color.BLUE, "蓝色");
for (Map.Entry<Color, String> me : eMap.entrySet()) {
System.out.println(me.getKey() + " --> " + me.getValue()) ;
}
}
}
./ch17/���渚�17-11/浠ｇ��17-11.java
package org.lxh.enumdemo.demo04;
import java.util.EnumSet;
import java.util.Iterator;
public class EnumSetDemo01 {
public static void main(String[] args) {
EnumSet<Color> eSet = EnumSet.allOf(Color.class); // 表示将全部的内容设置到集合
Iterator<Color> iter = eSet.iterator() ;
while(iter.hasNext()){
System.out.println(iter.next());
}
./ch17/���渚�17-12/浠ｇ��17-12.java
package org.lxh.enumdemo.demo04;
import java.util.EnumSet;
import java.util.Iterator;
public class EnumSetDemo02 {
public static void main(String[] args) {
EnumSet<Color> eSet = EnumSet.noneOf(Color.class); // 表示此类型的空集合
Iterator<Color> iter = eSet.iterator() ;
while(iter.hasNext()){
System.out.println(iter.next());
}
}
}
./ch17/���渚�17-13/浠ｇ��17-13.java
package org.lxh.enumdemo.demo05;
public enum Color {
RED("红色"), GREEN("绿色"), BLUE("蓝色");
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
Color(String name) {
this.setName(name);
}
}
./ch17/���渚�17-14/浠ｇ��17-14.java
package org.lxh.enumdemo.demo06;
public interface Info {
public String getColor() ;
}
./ch17/���渚�17-15/浠ｇ��17-15.java
package org.lxh.enumdemo.demo06;
public enum Color implements Info { // 实现接口
RED {
public String getColor() {
return "红色";
}
}，
GREEN {
public String getColor() {
return "绿色";
}
}，
BLUE {
public String getColor(){
return "蓝色" ;
}
};
}
./ch17/���渚�17-16/浠ｇ��17-16.java
package org.lxh.enumdemo.demo06;
public class TestColor {
public static void main(String[] args) {
for (Color c : Color.values()) {
System.out.println(c.ordinal() + " --> " + c.name() + "："
+ c.getColor());
}
}
}
./ch17/���渚�17-17/浠ｇ��17-17.java
package org.lxh.enumdemo.demo06;
public enum Color {
RED {
public String getColor() {
return "红色";
}
}，
GREEN {
public String getColor() {
return "绿色";
}
}，
BLUE {
public String getColor(){
return "蓝色" ;
}
};
public abstract String getColor() ;
}
./ch17/���渚�17-18/浠ｇ��17-18.java
package org.lxh.enumdemo.demo06;
public class TestColor {
public static void main(String[] args) {
for (Color c : Color.values()) {
System.out.println(c.ordinal() + " --> " + c.name() + "："
+ c.getColor());
}
}
}
./ch17/���渚�17-2/浠ｇ��17-2.java
package org.lxh.enumdemo.demo01;
public class TestColor {
public static void main(String[] args) {
Color c = Color.getInstance(0) ;
System.out.println(c.getName()) ;
}
}
./ch17/���渚�17-3/浠ｇ��17-3.java
package org.lxh.enumdemo.demo01;
public interface Color {
public static final int RED = 0;
public static final int GREEN = 1;
public static final int BLUE = 2;
}
./ch17/���渚�17-4/浠ｇ��17-4.java
01 package org.lxh.enumdemo.demo02;
02 public enum Color {
03 RED, GREEN, BLUE;
04 }
./ch17/���渚�17-5/浠ｇ��17-5.java
package org.lxh.enumdemo.demo03;
public class TestColor01 {
public static void main(String[] args) {
Color c = Color.RED ; // 得到红色
System.out.println(c) ;
}
}
./ch17/���渚�17-6/浠ｇ��17-6.java
package org.lxh.enumdemo.demo03;
public class TestColor03 {
public static void main(String[] args) {
switch (Color.RED) {
case RED: {
System.out.println("红色");
break;
}
case GREEN: {
System.out.println("绿色");
break;
}
case BLUE: {
System.out.println("蓝色");
break;
}
}
}
}
./ch17/���渚�17-7/浠ｇ��17-7.java
package org.lxh.enumdemo.demo03;
public class TestColor04 {
public static void main(String[] args) {
for (Color c : Color.values()) {
System.out.print(c + "、");
}
}
}
./ch17/���渚�17-8/浠ｇ��17-8.java
package org.lxh.enumdemo.demo03;
public class TestColor05 {
public static void main(String[] args) {
for (Color c : Color.values()) {
System.out.println(c.name() + " --> " + c.ordinal());
}
}
}
./ch17/���渚�17-9/浠ｇ��17-9.java
package org.lxh.enumdemo.demo03;
public class TestColor06 {
public static void main(String[] args) {
Color c = Color.valueOf(Color.class, "RED") ;
System.out.println(c) ;
}
}
./ch17/璺����涓����/Xiti_17.java
public enum Day {
MONDAY {
return "星期一";
}，
TUESDAY {
public String getDay() {
return "星期二";
}
}，
WEDNESDAY {
return "星期三" ;
};
public abstract String getDay() ;
}
./ch18/璺����涓����/Xiti_18.java
/**
* Describes the Request-For-Enhancement(RFE) that led
* to the presence of the annotated API element.
*/
public @interface RequestForEnhancement {
int id();
String synopsis();
String engineer() default "[unassigned]";
String date(); default "[unimplemented]";
}
./ch19/���渚�19-1/浠ｇ��19-1.java
public class ThreadDemo_1
{
public static void main(String args[])
{
new TestThread().run();
// 循环输出
for(int i=0;i<10;i++)
{
System.out.println("main 线程在运行");
}
}
}
class TestThread
{
public void run()
{
for(int i=0;i<10;i++)
{
System.out.println("TestThread 在运行");
}
}
}
./ch19/���渚�19-10/浠ｇ��9-10.java
public class ThreadDaemon
{
public static void main(String args[])
{
ThreadTest t = new ThreadTest() ;
Thread tt = new Thread(t) ;
tt.setDaemon(true) ; // 设置后台运行
tt.start();
}
}
class ThreadTest implements Runnable
{
public void run()
{
while(true)
{
System.out.println(Thread.currentThread().getName()+"is running.");
}
}
}
./ch19/���渚�19-11/浠ｇ��19-11.java
public class ThreadJoin
{
public static void main(String[] args)
{
ThreadTest t=new ThreadTest();
Thread pp=new Thread(t);
pp.start();
int i=0;
for(int x=0;x<10;x++)
{
if(i==5)
{
try
{
pp.join(); // 强制运行完一线程后，再运行后面的线程
}
catch(Exception e) // 会抛出InterruptedException
{
System.out.println(e.getMessage());
}
}
System.out.println("main Thread "+i++);
}
}
}
class ThreadTest implements Runnable
{
public void run()
{
String str=new String();
int i=0;
for(int x=0;x<10;x++)
{
System.out.println(Thread.currentThread().getName()+" ---->> "+i++);
}
}
}
./ch19/���渚�19-12/浠ｇ��19-12.java
public class TwoThreadSleep extends Thread {
public void run() {
loop();
}
public void loop() {
String name = Thread.currentThread().getName();
System.out.println(name+" ---->> 刚进入loop方法");
for ( int i = 0; i < 10; i++ )
{
try {
Thread.sleep(2000);
} catch ( InterruptedException x ) {}
System.out.println("name=" + name);
}
System.out.println(name+" ---->> 离开loop方法") ;
}
public static void main(String[] args)
{
TwoThreadSleep tt = new TwoThreadSleep();
tt.setName("my worker thread");
tt.start();
try {
Thread.sleep(700);
} catch ( InterruptedException x ) {}
tt.loop();
}
}
./ch19/���渚�19-13/浠ｇ��19-13.java
public class SleepInterrupt implements Runnable
{
public void run()
{
try {
System.out.println("在run()方法中 - 这个线程休眠20秒");
Thread.sleep(20000);
System.out.println("在run()方法中 - 继续运行");
}
catch (InterruptedException x) {
System.out.println("在run()方法中 - 中断线程");
return;
}
System.out.println("在run()方法中 - 休眠之后继续完成");
System.out.println("在run()方法中 - 正常退出");
}
public static void main(String[] args)
{
SleepInterrupt si = new SleepInterrupt();
Thread t = new Thread(si);
t.start();
// 在此休眠是为确保线程能运行一会
try {
Thread.sleep(2000);
}
catch (InterruptedException x) {}
System.out.println("在main()方法中 - 中断其它线程");
t.interrupt();
System.out.println("在main()方法中 - 退出");
}
}
./ch19/���渚�19-14/浠ｇ��19-14.java
public class InterruptCheck
{
public static void main(String[] args)
{
Thread t = Thread.currentThread();
System.out.println("A：t.isInterrupted() = " + t.isInterrupted());
t.interrupt();
System.out.println("B：t.isInterrupted() = " + t.isInterrupted());
System.out.println("C：t.isInterrupted() = " + t.isInterrupted());
try {
Thread.sleep(2000);
System.out.println("线程没有被中断！");
} catch ( InterruptedException x ) {
System.out.println("线程被中断！");
}
// 因为sleep抛出了异常，所以它清除了中断标志
System.out.println("D：t.isInterrupted() = " + t.isInterrupted());
}
}
./ch19/���渚�19-15/浠ｇ��19-15.java
public class ThreadDemo_5
{
public static void main(String [] args)
{
TestThread t = new TestThread() ;
// 启动了四个线程，实现了资源共享的目的
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
}
}
class TestThread implements Runnable
{
private int tickets=20;
public void run()
{
while(true)
{
if(tickets>0)
{
try{
Thread.sleep(100);
}
catch(Exception e){}
System.out.println(Thread.currentThread().getName()
+"出售票"+tickets--);
}
}
}
}
./ch19/���渚�19-16/浠ｇ��19-16.java
class A
{
synchronized void funA(B b)
{
String name=Thread.currentThread().getName();
System.out.println(name+ " 进入 A.foo ");
try
{
Thread.sleep(1000);
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
System.out.println(name+ " 调用 B类中的last()方法");
b.last();
}
synchronized void last()
{
System.out.println("A类中的last()方法");
}
}
class B
{
synchronized void funB(A a)
{
String name=Thread.currentThread().getName();
System.out.println(name + " 进入 B 类中的");
try
{
Thread.sleep(1000);
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
System.out.println(name + " 调用 A类中的last()方法");
a.last();
}
synchronized void last()
{
System.out.println("B类中的last()方法");
}
}
class DeadLockDemo implements Runnable
{
A a=new A();
B b=new B();
DeadLockDemo()
{
// 设置当前线程的名称
Thread.currentThread().setName("Main -->> Thread");
new Thread(this).start();
a.funA(b);
System.out.println("main线程运行完毕");
}
public void run()
{
Thread.currentThread().setName("Test -->> Thread");
b.funB(a);
System.out.println("其他线程运行完毕");
}
public static void main(String[] args)
{
new DeadLockDemo();
}
}
./ch19/���渚�19-17/浠ｇ��19-17.java
class Producer implements Runnable
{
P q=null;
public Producer(P q)
{
this.q=q;
}
public void run()
{
int i=0;
while(true)
{
if(i==0)
{
q.name="张三";
q.sex="男";
}
else
{
q.name="李四";
q.sex="女";
}
i=(i+1)%2;
}
}
}
class P
{
String name="李四";
String sex="女";
}
class Consumer implements Runnable
{
P q=null;
public Consumer(P q)
{
this.q=q;
}
public void run()
{
while(true)
{
System.out.println(q.name + " ---->" + q.sex);
}
}
}
public class ThreadCommunation
{
public static void main(String [] args)
{
P q=new P();
new Thread(new Producer(q)).start();
new Thread(new Consumer(q)).start();
}
}
./ch19/���渚�19-18/浠ｇ��19-18.java
class Producer implements Runnable
{
P q=null;
public Producer(P q)
{
this.q=q;
}
public void run()
{
int i=0;
while(true)
{
if(i==0)
{
q.set("张三","男");
}
else
{
q.set("李四","女");
}
i=(i+1)%2;
}
}
}
class P
{
private String name="李四";
private String sex="女";
public synchronized void set(String name,String sex)
{
this.name = name ;
this.sex =sex ;
}
public synchronized void get()
{
System.out.println(this.name + " ---->" + this.sex ) ;
}
}
class Consumer implements Runnable
{
P q=null;
public Consumer(P q)
{
this.q=q;
}
public void run()
{
while(true)
{
q.get();
}
}
}
public class ThreadCommunation
{
public static void main(String [] args)
{
P q=new P();
new Thread(new Producer(q)).start();
new Thread(new Consumer(q)).start();
}
}
./ch19/���渚�19-19/浠ｇ��19-19.java
class P
{
private String name="李四";
private String sex="女";
boolean bFull = false ;
public synchronized void set(String name,String sex)
{
if(bFull)
{
try
{
wait() ; // 后来的线程要等待
}
catch(InterruptedException e)
{}
}
this.name = name ;
try
{
Thread.sleep(10);
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
this.sex = sex ;
bFull = true ;
notify(); // 唤醒最先到达的线程
}
public synchronized void get()
{
if(!bFull)
{
try
{
wait() ;
}
catch(InterruptedException e)
{}
}
System.out.println(name+" ---->"+sex);
bFull = false ;
notify();
}
}
./ch19/���渚�19-2/浠ｇ��19-2.java
public class ThreadDemo_1
{
public static void main(String args[])
{
new TestThread().start();
// 循环输出
for(int i=0;i<10;i++)
{
System.out.println("main 线程在运行");
}
}
}
class TestThread extends Thread
{
public void run()
{
for(int i=0;i<10;i++)
{
System.out.println("TestThread 在运行");
}
}
}
./ch19/���渚�19-20/浠ｇ��19-20.java
public class ThreadLife
{
public static void main(String [] args)
{
TestThread t=new TestThread();
new Thread(t).start();
for(int i=0;i<10; i++)
{
if(i == 5)
t.stopMe();
System.out.println("Main 线程在运行");
}
}
}
class TestThread implements Runnable
{
private boolean bFlag = true;
public void stopMe()
{
bFlag = false;
}
public void run()
{
while(bFlag)
{
System.out.println(Thread.currentThread().getName()+" 在运行");
}
}
}
./ch19/���渚�19-3/浠ｇ��19-3.java
public class ThreadDemo_2
{
public static void main(String args[])
{
TestThread t = new TestThread() ;
new Thread(t).start();
// 循环输出
for(int i=0;i<10;i++)
{
System.out.println("main 线程在运行");
}
}
}
class TestThread implements Runnable
{
public void run()
{
for(int i=0;i<10;i++)
{
System.out.println("TestThread 在运行");
}
}
}
./ch19/���渚�19-4/浠ｇ��19-4.java
public class ThreadDemo_3
{
public static void main(String [] args)
{
TestThread t=new TestThread();
// 一个线程对象只能启动一次
t.start();
t.start();
t.start();
t.start();
}
}
class TestThread extends Thread
{
private int tickets=20;
public void run()
{
while(true)
{
if(tickets>0)
System.out.println(Thread.currentThread().getName()+"出售票"+tickets--);
}
}
}
./ch19/���渚�19-5/浠ｇ��19-5.java
public class ThreadDemo_3
{
public static void main(String [] args)
{
// 启动了四个线程，分别执行各自的操作
new TestThread().start();
new TestThread().start();
new TestThread().start();
new TestThread().start();
}
}
class TestThread extends Thread
{
private int tickets=20;
public void run()
{
while(true)
{
if(tickets>0)
System.out.println(Thread.currentThread().getName()
+"出售票"+tickets--);
}
}
}
./ch19/���渚�19-6/浠ｇ��19-6.java
public class ThreadDemo_4
{
public static void main(String [] args)
{
TestThread t = new TestThread() ;
// 启动了四个线程，并实现了资源共享的目的
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
}
}
class TestThread implements Runnable
{
private int tickets=20;
public void run()
{
while(true)
{
if(tickets>0)
System.out.println(Thread.currentThread().getName()+"出售票"+tickets--);
}
}
}
./ch19/���渚�19-7/浠ｇ��19-7.java
public class GetNameThreadDemo extends Thread
{
public void run()
{
for(int i=0;i<10;i++)
printMsg();
}
public void printMsg()
{
// 获得运行此代码的线程的引用
Thread t = Thread.currentThread();
String name = t.getName();
System.out.println("name = "+name);
}
public static void main(String[] args)
{
GetNameThreadDemo t1 = new GetNameThreadDemo();
t1.start();
for(int i=0;i<10;i++)
{
t1.printMsg();
}
}
}
./ch19/���渚�19-8/浠ｇ��19-8.java
public class SetNameThreadDemo extends Thread
{
public void run()
{
for(int i=0;i<10;i++)
{
printMsg();
}
}
public void printMsg()
{
// 获得运行此代码的线程的引用
Thread t = Thread.currentThread();
String name = t.getName();
System.out.println("name = "+name);
}
public static void main(String args[])
{
SetNameThreadDemo tt = new SetNameThreadDemo();
// 在这里设置线程的名称
tt.setName("test thread");
tt.start();
for(int i=0;i<10;i++)
{
tt.printMsg();
}
}
}
./ch19/���渚�19-9/浠ｇ��19-9.java
public class StartThreadDemo extends Thread
{
public void run()
{
for(int i=0;i<10;i++)
{
printMsg();
}
}
public void printMsg()
{
// 获得运行此代码的线程的引用
Thread t = Thread.currentThread();
String name = t.getName();
System.out.println("name = "+name);
}
public static void main(String[] args) {
StartThreadDemo t = new StartThreadDemo();
t.setName("test Thread");
System.out.println("调用start()方法之前 , t.isAlive() = "+t.isAlive());
t.start();
System.out.println("刚调用start()方法时 , t.isAlive() = "+t.isAlive());
for(int i=0;i<10;i++)
{
t.printMsg();
}
// 下面于句的数出结果是不固定的，有时输出false，有时输出true
System.out.println("main()方法结束时 , t.isAlive() = "+t.isAlive());
}
}
./ch19/璺����涓����/Xiti_19.java
public class Xiti_19 implements Runnable
{
public void run()
{
try {
System.out.println("在run()方法中 - 这个线程休眠10秒");
Thread.sleep(10000);
System.out.println("在run()方法中 - 继续运行");
}
catch (InterruptedException x) {
System.out.println("在run()方法中 - 中断线程");
return;
}
System.out.println("在run()方法中 - 休眠之后继续完成");
System.out.println("在run()方法中 - 正常退出");
}
public static void main(String[] args)
{
Xiti_19 si = new Xiti_19();
Thread t = new Thread(si);
t.start();
try {
Thread.sleep(1000);
}
catch (InterruptedException x) {}
System.out.println("在main()方法中 - 中断其它线程");
t.interrupt();
System.out.println("在main()方法中 - 退出");
}
}
./ch20/���渚�20-1/浠ｇ��20-1.java
import java.io.*;
public class FileDemo
{
public static void main(String[] args)
{
File f=new File("c:\\1.txt");
if(f.exists())
f.delete();
else
try
{
f.createNewFile();
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
// getName()方法，取得文件名
System.out.println("文件名："+f.getName());
// getPath()方法，取得文件路径
System.out.println("文件路径："+f.getPath());
// getAbsolutePath()方法，得到绝对路径名
System.out.println("绝对路径："+f.getAbsolutePath());
// getParent()方法，得到父文件夹名
System.out.println("父文件夹名称："+f.getParent());
// exists()，判断文件是否存在
System.out.println(f.exists()?"文件存在":"文件不存在");
// canWrite()，判断文件是否可写
System.out.println(f.canWrite()?"文件可写":"文件不可写");
// canRead()，判断文件是否可读
System.out.println(f.canRead()?"文件可读":"文件不可读");
/// isDirectory()，判断是否是目录
System.out.println(f.isDirectory()?"是":"不是"+"目录");
// isFile()，判断是否是文件
System.out.println(f.isFile()?"是文件":"不是文件");
// isAbsolute()，是否是绝对路径名称
System.out.println(f.isAbsolute()?"是绝对路径":"不是绝对路径");
// lastModified()，文件最后的修改时间
System.out.println("文件最后修改时间："+f.lastModified());
// length()，文件的长度
System.out.println("文件大小："+f.length()+" Bytes");
}
}
./ch20/���渚�20-10/浠ｇ��20-10.java
import java.io.*;
public class SequenceDemo
{
public static void main(String[] args) throws IOException
{
// 声明两个文件读入流
FileInputStream in1 = null, in2 = null;
// 声明一个序列流
SequenceInputStream s = null;
FileOutputStream out = null;
try
{
// 构造两个被读入的文件
File inputFile1 = new File("c:\\1.txt");
File inputFile2 = new File("c:\\2.txt");
// 构造一个输出文件
File outputFile = new File("c:\\12.txt");
in1 = new FileInputStream(inputFile1);
in2 = new FileInputStream(inputFile2);
// 将两输入流合为一个输入流
s = new SequenceInputStream(in1, in2);
out = new FileOutputStream(outputFile);
int c;
while ((c = s.read()) != -1)
out.write(c);
in1.close();
in2.close();
s.close();
out.close();
System.out.println("ok...");
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
if (in1 != null)
try {
in1.close();
} catch (IOException e) {
}
if (in2 != null)
try {
in2.close();
} catch (IOException e) {
}
if (s != null)
try {
s.close();
} catch (IOException e) {
}
if (out != null)
try {
out.close();
} catch (IOException e) {
}
}
}
}
./ch20/���渚�20-11/浠ｇ��20-11.java
import java.io.*;
public class BufferDemo
{
public static void main(String args[])
{
BufferedReader buf = null;
buf = new BufferedReader(new InputStreamReader(System.in));
String str = null;
while (true)
{
System.out.print("请输入数字：");
try
{
str = buf.readLine();
} catch (IOException e)
{
e.printStackTrace();
}
int i = -1;
try
{
i = Integer.parseInt(str);
i++;
System.out.println("输入的数字修改后为：" + i);
break;
}
catch (Exception e)
{
System.out.println("输入的内容不正确，请重新输入！");
}
}
}
}
./ch20/���渚�20-12/浠ｇ��20-12.java
import java.io.* ;
public class EncodingDemo
{
public static void main(String args[]) throws Exception
{
// 在这里将字符串通过getBytes()方法，编码成GB2312
byte b[] = "大家一起来学Java语言".getBytes("GB2312") ;
OutputStream out = new FileOutputStream(new File("c:\\encoding.txt")) ;
out.write(b) ;
out.close() ;
}
}
./ch20/���渚�20-13/浠ｇ��20-13.java
public class SetDemo
{
public static void main(String args[])
{
System.getProperties().put("file.encoding","GB2312") ;
}
}
./ch20/���渚�20-14/浠ｇ��20-14.java
import java.io.* ;
public class EncodingDemo
{
public static void main(String args[]) throws Exception
{
// 在这里将字符串通过getBytes()方法，编码成ISO8859-1
byte b[] = "大家一起来学Java语言".getBytes("ISO8859-1") ;
OutputStream out = new FileOutputStream(new File("c:\\encoding.txt")) ;
out.write(b) ;
out.close() ;
}
}
./ch20/���渚�20-15/浠ｇ��20-15.java
public class GetDemo
{
public static void main(String args[])
{
// 输出全部环境变量
System.getProperties().list(System.out);
}
}
./ch20/���渚�20-16/浠ｇ��20-16.java
import java.io.* ;
public class Person implements Serializable
{
private String name ;
private int age ;
public Person(String name,int age)
{
this.name = name ;
this.age = age ;
}
public String toString()
{
return " 姓名："+this.name+"，年龄："+this.age ;
}
};
./ch20/���渚�20-17/浠ｇ��20-17.java
import java.io.*;
public class SerializableDemo
{
public static void main( String args[] ) throws Exception
{
File f = new File("SerializedPerson") ;
serialize(f);
deserialize(f);
}
// 以下方法为序列化对象方法
public static void serialize(File f) throws Exception
{
OutputStream outputFile = new FileOutputStream(f);
ObjectOutputStream cout = new ObjectOutputStream(outputFile);
cout.writeObject(new Person("张三",25));
cout.close();
}
// 以下方法为反序列化对象方法
public static void deserialize(File f) throws Exception
{
InputStream inputFile = new FileInputStream(f);
ObjectInputStream cin = new ObjectInputStream(inputFile);
Person p = (Person) cin.readObject();
System.out.println(p);
}
}
./ch20/���渚�20-2/浠ｇ��20-2.java
import java.io.*;
public class RandomFileDemo
{
public static void main(String [] args) throws Exception
{
Employee e1 = new Employee("zhangsan",23);
Employee e2 = new Employee("lisi",24);
Employee e3 = new Employee("wangwu",25);
RandomAccessFile ra=new RandomAccessFile("c:\\employee.txt","rw");
ra.write(e1.name.getBytes());
ra.writeInt(e1.age);
ra.write(e2.name.getBytes());
ra.writeInt(e2.age);
ra.write(e3.name.getBytes());
ra.writeInt(e3.age);
ra.close();
RandomAccessFile raf=new RandomAccessFile("c:\\employee.txt","r");
int len=8;
raf.skipBytes(12); // 跳过第一个员工的信息,其姓名8字节,年龄4字节
System.out.println("第二个员工信息:");
String str="";
for(int i=0;i<len;i++)
str=str+(char)raf.readByte();
System.out.println("name:"+str);
System.out.println("age:"+raf.readInt());
System.out.println("第一个员工的信息:");
raf.seek(0); // 将文件指针移动到文件开始位置
str="";
for(int i=0;i<len;i++)
str=str+(char)raf.readByte();
System.out.println("name:"+str);
System.out.println("age:"+raf.readInt());
System.out.println("第三个员工的信息:");
raf.skipBytes(12); // 跳过第二个员工信息
str="" ;
for(int i=0;i<len;i++)
str=str+(char)raf.readByte();
System.out.println("name:"+str.trim());
System.out.println("age:"+raf.readInt());
raf.close();
}
}
class Employee
{
String name;
int age;
final static int LEN=8;
public Employee(String name,int age)
{
if(name.length()>LEN)
{
name=name.substring(0,8);
}
else
{
while(name.length()<LEN)
name=name+"\u0000";
}
this.name=name;
this.age=age;
}
}
./ch20/���渚�20-3/浠ｇ��20-3.java
import java.io.*;
public class StreamDemo
{
public static void main(String args[])
{
File f = new File("c:\\temp.txt") ;
OutputStream out = null ;
try
{
out = new FileOutputStream(f) ;
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
// 将字符串转成字节数组
byte b[] = "Hello World!!!".getBytes() ;
try
{
// 将byte数组写入到文件之中
out.write(b) ;
}
catch (IOException e1)
{
e1.printStackTrace();
}
try
{
out.close() ;
}
catch (IOException e2)
{
e2.printStackTrace();
}
// 以下为读文件操作
InputStream in = null ;
try
{
in = new FileInputStream(f) ;
}
catch (FileNotFoundException e3)
{
e3.printStackTrace();
}
// 开辟一个空间用于接收文件读进来的数据
byte b1[] = new byte[1024] ;
int i = 0 ;
try
{
// 将b1的引用传递到read()方法之中，同时此方法返回读入数据的个数
i = in.read(b1) ;
}
catch (IOException e4)
{
e4.printStackTrace();
}
try
{
in.close() ;
}
catch (IOException e5)
{
e5.printStackTrace();
}
//将byte数组转换为字符串输出
System.out.println(new String(b1,0,i)) ;
}
}
./ch20/���渚�20-4/浠ｇ��20-4.java
import java.io.*;
public class CharDemo
{
public static void main(String args[])
{
File f = new File("c:\\temp.txt") ;
Writer out = null ;
try
{
out = new FileWriter(f) ;
}
catch (IOException e)
{
e.printStackTrace();
}
// 声明一个String类型对象
String str = "Hello World!!!" ;
try
{
// 将str内容写入到文件之中
out.write(str) ;
}
catch (IOException e1)
{
e1.printStackTrace();
}
try
{
out.close() ;
}
catch (IOException e2)
{
e2.printStackTrace();
}
// 以下为读文件操作
Reader in = null ;
try
{
in = new FileReader(f) ;
}
catch (FileNotFoundException e3)
{
e3.printStackTrace();
}
// 开辟一个空间用于接收文件读进来的数据
char c1[] = new char[1024] ;
int i = 0 ;
try
{
// 将c1的引用传递到read()方法之中，同时此方法返回读入数据的个数
i = in.read(c1) ;
}
catch (IOException e4)
{
e4.printStackTrace();
}
try
{
in.close() ;
}
catch (IOException e5)
{
e5.printStackTrace();
}
//将字符数组转换为字符串输出
System.out.println(new String(c1,0,i)) ;
}
}
./ch20/���渚�20-5/浠ｇ��20-5.java
import java.io.*;
public class PipeStreamDemo
{
public static void main(String args[])
{
try
{
Sender sender = new Sender(); // 产生两个线程对象
Receiver receiver = new Receiver();
PipedOutputStream out = sender.getOutputStream(); // 写入
PipedInputStream in = receiver.getInputStream(); // 读出
out.connect(in); // 将输出发送到输入
sender.start(); // 启动线程
receiver.start();
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
}
class Sender extends Thread
{
private PipedOutputStream out=new PipedOutputStream();
public PipedOutputStream getOutputStream()
{
return out;
}
public void run()
{
String s=new String("Receiver，你好!");
try
{
out.write(s.getBytes()); // 写入（发送）
out.close();
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
}
class Receiver extends Thread
{
private PipedInputStream in=new PipedInputStream();
public PipedInputStream getInputStream()
{
return in;
}
public void run()
{
String s=null;
byte [] buf = new byte[1024];
try
{
int len =in.read(buf); // 读出数据
s = new String(buf,0,len);
System.out.println("收到了以下信息："+s);
in.close();
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
}
./ch20/���渚�20-6/浠ｇ��20-6.java
import java.io.* ;
public class ByteArrayDemo {
public static void main(String[] args) throws Exception
{
String tmp = "abcdefghijklmnopqrstuvwxyz";
byte[] src = tmp.getBytes(); // src为转换前的内存块
ByteArrayInputStream input = new ByteArrayInputStream(src);
ByteArrayOutputStream output = new ByteArrayOutputStream();
new ByteArrayDemo().transform(input, output);
byte[] result = output.toByteArray(); // result为转换后的内存块
System.out.println(new String(result));
}
public void transform(InputStream in, OutputStream out)
{
int c = 0;
try
{
while ((c = in.read()) != -1) // read在读到流的结尾处返回-1
{
int C = (int) Character.toUpperCase((char) c);
out.write(C);
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
./ch20/���渚�20-7/浠ｇ��20-7.java
import java.io.*;
public class SystemPrintDemo
{
public static void main(String args[])
{
PrintWriter out = null;
// 通过System.out为PrintWriter实例化
out = new PrintWriter(System.out);
// 向屏幕上输出
out. print ("Hello World!");
out.close();
}
}
./ch20/���渚�20-8/浠ｇ��20-8.java
import java.io.*;
public class FilePrint
{
public static void main(String args[])
{
PrintWriter out = null ;
File f = new File("c:\\temp.txt") ;
try
{
out = new PrintWriter(new FileWriter(f)) ;
}
catch (IOException e)
{
e.printStackTrace();
}
// 由FileWriter实例化，则向文件中输出
out. print ("Hello World!"+"\r\n");
out.close() ;
}
}
./ch20/���渚�20-9/浠ｇ��20-9.java
import java.io.* ;
public class DataStreamDemo
{
public static void main(String[] args) throws IOException
{
// 将数据写入某一种载体
DataOutputStream out = new DataOutputStream(
w FileOutputStream("order.txt"));
// 价格
double[] prices = { 18.99, 9.22, 14.22, 5.22, 4.21 };
// 数目
int[] units = { 10, 10, 20, 39, 40 };
// 产品名称
String[] descs = { "T恤杉", "杯子", "洋娃娃", "大头针", "钥匙链" };
// 向数据过滤流写入主要类型
for (int i = 0; i < prices.length; i++)
{
// 写入价格，使用tab隔开数据
out.writeDouble(prices[i]);
out.writeChar('\t');
// 写入数目
out.writeInt(units[i]);
out.writeChar('\t');
// 写入产品名称，行尾加入换行符
out.writeChars(descs[i]);
out.writeChar('\n');
}
out.close();
// 将数据读出
DataInputStream in = new DataInputStream(
w FileInputStream("order.txt"));
double price;
int unit;
StringBuffer desc;
double total = 0.0;
try
{
// 当文本被全部读出以后会抛出EOFException异常，中断循环
while (true)
{
// 读出价格
price = in.readDouble();
// 跳过tab
in.readChar();
// 读出数目
unit = in.readInt();
// 跳过tab
in.readChar();
char chr;
// 读出产品名称
desc = new StringBuffer();
while ((chr = in.readChar()) != '\n')
{
desc.append(chr);
}
System.out.println("定单信息： " + "产品名称："+desc
+"，\t数量：+unit+"，\t价格："+price);
total = total + unit * price;
}
}
catch (EOFException e)
{
System.out.println("\n总共需要：" + total+"元");
}
in.close();
}
}
./ch20/璺����涓����/Xiti_20.java
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
public class Xiti_20
{
public static void main(String args[])
{
File f = new File("c:\\Xiti_16.txt") ;
Writer out = null ;
try
{
out = new FileWriter(f) ;
}
catch (IOException e)
{
e.printStackTrace();
}
String str = "Here is my file." ;
try
{
out.write(str) ;
}
catch (IOException e1)
{
e1.printStackTrace();
}
try
{
out.close() ;
}
catch (IOException e2)
{
e2.printStackTrace();
}
Reader in = null ;
try
{
in = new FileReader(f) ;
}
catch (FileNotFoundException e3)
{
e3.printStackTrace();
}
char c1[] = new char[1024] ;
int i = 0 ;
try
{
i = in.read(c1) ;
}
catch (IOException e4)
{
e4.printStackTrace();
}
try
{
in.close() ;
}
catch (IOException e5)
{
e5.printStackTrace();
}
System.out.println(new String(c1,0,i)) ;
}
}
./ch21/AcceptParam/src/test/AcceptParam.java
package test ;
import java.awt.Graphics;
import java.applet.Applet;
public class AcceptParam extends Applet
{
String tempString,score;
public void init()
{
// 得到web页中的str参数的值
tempString = getParameter("str");
if(tempString.equals("及格")) // 如果字符串等于"及格"
score = "60-70";
else if(tempString.equals("中")) // 如果字符串等于"中"
score = "70-80";
else if(tempString.equals("良")) // 如果字符串等于"良"
score = "80-90";
else if(tempString.equals("优")) // 如果字符串等于"优"
score = "90-100";
else
score = "0-60" ;
}
public void paint(Graphics g)
{
g.drawString(score,10,25); // 输出分数段
}
}
./ch21/HelloApplet/src/test/HelloApplet.java
package test ;
import java.awt.Graphics;
import java.applet.Applet;
public class HelloApplet extends Applet
{
public void paint(Graphics g)
{
g.drawString("这是我的Java Applet程序！",5,30); // 输出字符串
}
}
./ch21/HelloAppletDemo/src/test/HelloAppletDemo.java
package test ;
import java.awt.Graphics;
import java.applet.Applet;
public class HelloAppletDemo extends Applet
{
String mystring="";
public void paint(Graphics g)
{
g.drawString(mystring,5,30); // 输出字符串
}
public void init()
{
mystring=mystring+"正在初始化……";
repaint();
}
public void start()
{
mystring=mystring+"正在开始执行程序……";
repaint();
}
public void stop()
{
mystring=mystring+"正在停止执行程序……";
repaint();
}
public void destory()
{
mystring=mystring+"正在收回资源……";
repaint();
}
}
./ch21/璺����涓����/Xiti_21/src/test/Xiti_21.java
package test ;
import java.awt.Graphics;
import java.applet.Applet;
public class Xiti_21 extends Applet
{
public void paint(Graphics g)
{
g.drawString("这是我的Java Applet程序！",5,30); // 输出字符串
}
}
./ch22/���渚�22-1/浠ｇ��22-1.java
import java.io.*;
import java.net.*;
public class HelloServer
{
public static void main(String[] args) throws IOException
{
ServerSocket serversocket=null;
PrintWriter out=null;
try
{
// 在下面实例化了一个服务器端的Socket连接
serversocket=new ServerSocket(9999);
}
catch(IOException e)
{
System.err.println("Could not listen on port:9999.");
System.exit(1);
}
Socket clientsocket=null;
try
{
// accept()方法用来监听客户端的连接
clientsocket=serversocket.accept();
}
catch(IOException e)
{
System.err.println("Accept failed.");
System.exit(1);
}
out=new PrintWriter(clientsocket.getOutputStream(),true);
out.println("hello world!");
clientsocket.close();
serversocket.close();
}
}
./ch22/���渚�22-2/浠ｇ��22-2.java
import java.io.*;
import java.net.*;
public class HelloClient
{
public static void main(String[] args) throws IOException
{
Socket hellosocket=null;
BufferedReader in=null;
// 下面这段程序，用来将输入输出流与socket关联
try
{
hellosocket=new Socket("localhost",9999);
in=new BufferedReader(
tStreamReader(hellosocket.getInputStream()));
}
catch(UnknownHostException e)
{
System.err.println("Don't know about host:localhost!");
System.exit(1);
}
catch(IOException e)
{
System.err.println("Couldn't get I/O for the connection.");
System.exit(1);
}
System.out.println(in.readLine());
in.close();
hellosocket.close();
}
}
./ch22/���渚�22-3/浠ｇ��22-3.java
import java.io.*;
import java.net.*;
public class EchoServer
{
public static void main(String[] args) throws IOException
{
ServerSocket serverSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try
{
// 实例化监听端口
serverSocket = new ServerSocket(1111);
}
catch (IOException e)
{
System.err.println("Could not listen on port: 1111.");
System.exit(1);
}
Socket incoming = null;
while(true)
{
incoming = serverSocket.accept();
out = new PrintWriter(incoming.getOutputStream(), true);
// 将字节流放入字符流缓冲之中
in = new BufferedReader(
new InputStreamReader(incoming.getInputStream()));
// 提示信息
out.println("Hello! . . . ");
out.println("Enter BYE to exit");
out.flush();
// 在没有异常的情况下不断循环
while(true)
{
// 只有当有用户输入数据的时候才返回数据内容
String str = in.readLine();
// 当用户连接断掉时会返回空值null
if(str == null)
{
// 退出循环
break;
}
else
{
// 对用户输入字串加前缀Echo：，将此信息打印到客户端
out.println("Echo: "+str);
out.flush();
// 退出命令，equalsIgnoreCase()是不区分大小写的比较
if(str.trim().equalsIgnoreCase("BYE"))
break;
}
}
// 收尾工作
out.close();
in.close();
incoming.close();
serverSocket.close();
}
}
}
./ch22/���渚�22-4/浠ｇ��22-4.java
import java.io.*;
import java.net.*;
// 客户端程序
public class EchoClient
{
public static void main(String[] args) throws IOException
{
Socket echoSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try
{
echoSocket = new Socket ( "localhost", 1111);
out = new PrintWriter(echoSocket.getOutputStream(), true);
in = new BufferedReader(
new InputStreamReader(echoSocket.getInputStream()));
}
catch (UnknownHostException e)
{
System.err.println("Don't know about host: localhost.");
System.exit(1);
}
System.out.println(in.readLine());
System.out.println(in.readLine());
BufferedReader stdIn =
new BufferedReader(new InputStreamReader(System.in));
String userInput;
// 将客户端Socket输入流输出到标准输出
while ((userInput = stdIn.readLine()) != null)
{
out.println(userInput);
System.out.println(in.readLine());
}
out.close();
in.close();
echoSocket.close();
}
}
./ch22/���渚�22-5/浠ｇ��22-5.java
import java.net.*;
import java.io.*;
public class EchoMultiServerThread extends Thread
{
private Socket socket = null;
public EchoMultiServerThread(Socket socket)
{
super("EchoMultiServerThread");
// 声明一个socket对象
this.socket = socket;
}
public void run()
{
try
{
PrintWriter out = null;
BufferedReader in = null;
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
out.println("Hello! . . . ");
out.println("Enter BYE to exit");
out.flush();
while(true)
{
String str = in.readLine();
if(str == null)
{
break;
}
else
{
out.println("Echo: "+str);
out.flush();
if(str.trim().equalsIgnoreCase("BYE"))
break;
}
}
out.close();
in.close();
socket.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
./ch22/���渚�22-6/浠ｇ��22-6.java
import java.io.*;
import java.net.*;
// 多线程的服务器端程序
public class EchoServerThread
{
public static void main(String[] args) throws IOException
{
// 声明一个serverSocket
ServerSocket serverSocket = null;
// 声明一个监听标识
boolean listening = true;
try
{
serverSocket = new ServerSocket(1111);
}
catch (IOException e)
{
System.err.println("Could not listen on port: 1111.");
System.exit(1);
}
// 如果处于监听状态则开启一个线程
while(listening)
{
// 实例化一个服务端的socket与请求socket建立连接
new EchoMultiServerThread(serverSocket.accept()).start();
}
// 将serverSocket的关闭操作放在循环外，
// 只有当监听状态为false时，服务才关闭
serverSocket.close();
}
}
./ch22/���渚�22-7/浠ｇ��22-7.java
import java.net.*;
import java.io.*;
public class UdpReceive
{
public static void main(String[] args)
{
DatagramSocket ds = null;
byte[] buf = new byte[1024];
DatagramPacket dp = null;
try {
ds = new DatagramSocket(9000);
} catch (SocketException ex) {
}
// 创建DatagramPacket时，要求的数据格式是byte型数组
dp = new DatagramPacket(buf, 1024);
try {
ds.receive(dp);
} catch (IOException ex1) {
}
/*
* 调用public String(byte[] bytes,int offset,int length)构造方法，
* 将byte型的数组转换成字符串
*/
String str = new String(dp.getData(), 0, dp.getLength()) + " from "
+ dp.getAddress().getHostAddress() + " : " + dp.getPort();
System.out.println(str);
ds.close();
}
}
./ch22/���渚�22-8/浠ｇ��22-8.java
import java.net.*;
import java.io.*;
public class UdpSend
{
public static void main(String[] args)
{
// 要编写UDP网络程序，首先要用到java.net.DatagramSocket类
DatagramSocket ds = null;
DatagramPacket dp = null;
try {
ds = new DatagramSocket(3000);
}
catch (SocketException ex) {
}
String str = "hello world ";
try {
dp = new DatagramPacket(str.getBytes(), str.length(), InetAddress
.getByName("localhost"), 9000);
// 调用getByName()方法可以返回一个InetAddress类的实例对象
} catch (UnknownHostException ex1) {
}
try {
ds.send(dp);
} catch (IOException ex2) {
}
ds.close();
}
}
./ch22/璺����涓����/Xiti_22/src/Xiti_22_client.java
import java.io.*;
import java.net.*;
// 客户端程序
public class Xiti_22_client
{
public static void main(String[] args) throws IOException
{
Socket echoSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try
{
echoSocket = new Socket ( "localhost", 1111);
out = new PrintWriter(echoSocket.getOutputStream(), true);
in = new BufferedReader(
new InputStreamReader(echoSocket.getInputStream()));
}
catch (UnknownHostException e)
{
System.err.println("Don't know about host: localhost.");
System.exit(1);
}
System.out.println(in.readLine());
System.out.println(in.readLine());
BufferedReader stdIn =
new BufferedReader(new InputStreamReader(System.in));
String userInput;
while ((userInput = stdIn.readLine()) != null)
{
out.println(userInput);
System.out.println(in.readLine());
}
out.close();
in.close();
echoSocket.close();
}
}
./ch22/璺����涓����/Xiti_22/src/Xiti_22_server.java
import java.io.*;
// 服务器端
import java.net.*;
public class Xiti_22_server
{
public static void main(String[] args) throws IOException
{
ServerSocket serverSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try
{
serverSocket = new ServerSocket(1111);
}
catch (IOException e)
{
System.err.println("Could not listen on port: 1111.");
System.exit(1);
}
Socket incoming = null;
while(true)
{
incoming = serverSocket.accept();
out = new PrintWriter(incoming.getOutputStream(), true);
in = new BufferedReader(
new InputStreamReader(incoming.getInputStream()));
out.println("Hello! . . . ");
out.println("Enter BYE to exit");
out.flush();
while(true)
{
String str = in.readLine();
if(str == null)
{
break;
}
else
{
out.println("客户器端: "+str);
out.flush();
if(str.trim().equalsIgnoreCase("BYE"))
break;
}
}
out.close();
in.close();
incoming.close();
serverSocket.close();
}
}
}
./ch23/JDBCproject1.0/wf/network/execdemo01/InputData.java
package wf.network.execdemo01;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class InputData {
private BufferedReader buf = null;
public InputData() {
this.buf = new BufferedReader(new InputStreamReader(System.in));
}
public String getString(String info) {
String str = null;
System.out.print(info);// 打印提示信息
try {
str = this.buf.readLine();
} catch (IOException e) {
e.printStackTrace();
}
return str;
}
public int getInt(String info, String err) {
int temp = 0;
boolean flag = true;// 定义一个标志位
while (flag) {
String str = this.getString(info);
if (str.matches("\\d+")) {
temp = Integer.parseInt(str);
flag = false;// 退出循环
} else {
System.out.print(err);
}
}
return temp;
}
public float getFloat(String info, String err) {
float temp = 0.0f;
boolean flag = true;// 定义一个标志位
while (flag) {
String str = this.getString(info);
if (str.matches("\\d+.?\\d+")) {
temp = Float.parseFloat(str);
flag = false;// 退出循环
} else {
System.out.print(err);
}
}
return temp;
}
public char getChar(String info, String err) {
char temp = ' ';
boolean flag = true;// 定义一个标志位
while (flag) {
String str = this.getString(info);
if (str.matches("\\w")) {
temp = str.charAt(0);
flag = false;// 退出循环
} else {
System.out.print(err);
}
}
return temp;
}
public Date getDate(String info, String err) {
Date temp = null ;
boolean flag = true;// 定义一个标志位
while (flag) {
String str = this.getString(info);
if (str.matches("\\d{4}-\\d{2}-\\d{2}")) {
try {
temp = new SimpleDateFormat("yyyy-MM-dd").parse(str) ;
} catch (ParseException e) {
System.out.print(err) ;
}
flag = false;// 退出循环
} else {
System.out.print(err);
}
}
return temp;
}
}
./ch23/JDBCproject1.0/wf/network/execdemo01/InsertDemo.java
package wf.network.execdemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class InsertDemo {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null; // 表示数据库的更新操作
InputData input = new InputData() ;
String name = input.getString("请输入姓名：");
int age = input.getInt("请输入年龄：", "年龄必须是数字，");
String date = input.getString("请输入生日：");
float salary = input.getFloat("请输入工资：", "输入的工资必须是数字，");
String sql = "INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'"
+ name + "'," + age + ",TO_DATE('"
+ date + "','yyyy-mm-dd')," + salary + ") ";
System.out.println(sql) ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需要通过Connection接口进行实例化操作
stmt = conn.createStatement();
// 执行SQL语句，更新数据库
stmt.executeUpdate(sql);
// 4、关闭数据库
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/JDBCproject01/ConnectJDBC.java
package wf.network.JDBCproject01;
import java.sql.Connection;
import java.sql.DriverManager;
public class ConnectJDBC {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
System.out.println(conn);
// 4、关闭数据库
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/prepareddemo01/BatchInsertDemo.java
package wf.network.prepareddemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
public class BatchInsertDemo {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
PreparedStatement pstmt = null; // 表示数据库的更新操作
String sql = "INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,?,?,?,?) ";
System.out.println(sql) ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、PreparedStatement接口需要通过Connection接口进行实例化操作
pstmt = conn.prepareStatement(sql) ;// 使用预处理的方式创建对象
for(int i=0;i<10;i++){
pstmt.setString(1, "lxh-" + i);// 第一个？号的内容
pstmt.setInt(2, 20 + i); // 第二个？号的内容
pstmt.setDate(3, new java.sql.Date(new java.util.Date().getTime()));
pstmt.setFloat(4, 900*i);
pstmt.addBatch() ; // 增加批处理
}
// 执行SQL语句，更新数据库
int i[] = pstmt.executeBatch() ;
System.out.println(i.length);
// 4、关闭数据库
pstmt.close() ;
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/prepareddemo01/InputData.java
package wf.network.prepareddemo01;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class InputData {
private BufferedReader buf = null;
public InputData() {
this.buf = new BufferedReader(new InputStreamReader(System.in));
}
public String getString(String info) {
String str = null;
System.out.print(info);// 打印提示信息
try {
str = this.buf.readLine();
} catch (IOException e) {
e.printStackTrace();
}
return str;
}
public int getInt(String info, String err) {
int temp = 0;
boolean flag = true;// 定义一个标志位
while (flag) {
String str = this.getString(info);
if (str.matches("\\d+")) {
temp = Integer.parseInt(str);
flag = false;// 退出循环
} else {
System.out.print(err);
}
}
return temp;
}
public float getFloat(String info, String err) {
float temp = 0.0f;
boolean flag = true;// 定义一个标志位
while (flag) {
String str = this.getString(info);
if (str.matches("\\d+.?\\d+")) {
temp = Float.parseFloat(str);
flag = false;// 退出循环
} else {
System.out.print(err);
}
}
return temp;
}
public char getChar(String info, String err) {
char temp = ' ';
boolean flag = true;// 定义一个标志位
while (flag) {
String str = this.getString(info);
if (str.matches("\\w")) {
temp = str.charAt(0);
flag = false;// 退出循环
} else {
System.out.print(err);
}
}
return temp;
}
public Date getDate(String info, String err) {
Date temp = null ;
boolean flag = true;// 定义一个标志位
while (flag) {
String str = this.getString(info);
if (str.matches("\\d{4}-\\d{2}-\\d{2}")) {
try {
temp = new SimpleDateFormat("yyyy-MM-dd").parse(str) ;
} catch (ParseException e) {
System.out.print(err) ;
}
flag = false;// 退出循环
} else {
System.out.print(err);
}
}
return temp;
}
}
./ch23/JDBCproject1.0/wf/network/prepareddemo01/InsertDemo.java
package wf.network.prepareddemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.Date;
public class InsertDemo {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
PreparedStatement pstmt = null; // 表示数据库的更新操作
InputData input = new InputData() ;
String name = input.getString("请输入姓名：");
int age = input.getInt("请输入年龄：", "年龄必须是数字，");
Date date = input.getDate("请输入生日：","输入的不是日期，");
float salary = input.getFloat("请输入工资：", "输入的工资必须是数字，");
String sql = "INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,?,?,?,?) ";
System.out.println(sql) ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、PreparedStatement接口需要通过Connection接口进行实例化操作
pstmt = conn.prepareStatement(sql) ;// 使用预处理的方式创建对象
pstmt.setString(1, name) ;// 第一个？号的内容
pstmt.setInt(2, age) ; // 第二个？号的内容
pstmt.setDate(3, new java.sql.Date(date.getTime())) ;
pstmt.setFloat(4,salary) ;
// 执行SQL语句，更新数据库
pstmt.executeUpdate();
// 4、关闭数据库
pstmt.close() ;
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/prepareddemo01/SelectDemo01.java
package wf.network.prepareddemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Date;
public class SelectDemo01 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
PreparedStatement pstmt = null ; // 表示数据库的更新操作
ResultSet result = null ;// 表示接收数据库的查询结果
String sql = "SELECT pid,name,age,birthday,salary FROM person" ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、PreparedStatement接口需要通过Connection接口进行实例化操作
pstmt = conn.prepareStatement(sql) ;
// 执行SQL语句，查询数据库
result = pstmt.executeQuery() ;
while(result.next()){// 是否有下一行数据
int pid = result.getInt(1) ;
String name = result.getString(2) ;
int age = result.getInt(3) ;
Date birthday = result.getDate(4) ;
float salary = result.getFloat(5) ;
System.out.print("pid = " + pid + "；") ;
System.out.print("name = " + name + "；") ;
System.out.print("age = " + age + "；") ;
System.out.print("birthday = " + birthday + "；") ;
System.out.println("salary = " + salary + "；") ;
}
// 4、关闭数据库
result.close() ;
pstmt.close() ;
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/prepareddemo01/SelectDemo02.java
package wf.network.prepareddemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Date;
public class SelectDemo02 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
PreparedStatement pstmt = null ; // 表示数据库的更新操作
ResultSet result = null ;// 表示接收数据库的查询结果
String keyWord = "" ;
String sql = "SELECT pid,name,age,birthday,salary FROM person WHERE name LIKE ? OR birthday LIKE ?" ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、PreparedStatement接口需要通过Connection接口进行实例化操作
pstmt = conn.prepareStatement(sql) ;
pstmt.setString(1,"%"+keyWord+"%") ;
pstmt.setString(2,"%"+keyWord+"%") ;
// 执行SQL语句，查询数据库
result = pstmt.executeQuery() ;
while(result.next()){// 是否有下一行数据
int pid = result.getInt(1) ;
String name = result.getString(2) ;
int age = result.getInt(3) ;
Date birthday = result.getDate(4) ;
float salary = result.getFloat(5) ;
System.out.print("pid = " + pid + "；") ;
System.out.print("name = " + name + "；") ;
System.out.print("age = " + age + "；") ;
System.out.print("birthday = " + birthday + "；") ;
System.out.println("salary = " + salary + "；") ;
}
// 4、关闭数据库
result.close() ;
pstmt.close() ;
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/resultsetdemo01/ResultSetDemo01.java
package wf.network.resultsetdemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Date;
public class ResultSetDemo01 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null ; // 表示数据库的更新操作
ResultSet result = null; //表示
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需要通过Connection接口进行实例化操作
stmt = conn.createStatement() ;
// 执行SQL语句，更新数据库
result = stmt.executeQuery("SELECT pid,name,age,birthday,salary FROM person");
while (result.next()){ // 是否有下一行信息
int pid = result.getInt("pid") ;
String name = result.getString("name");
int age = result.getInt("age");
Date birthday = result.getDate("birthday");
float salary = result.getFloat("salary");
System.out.print("pid=" + pid+";");
System.out.print("name=" + name+";");
System.out.print("age=" + age+";");
System.out.print("birthday=" + birthday+";");
System.out.println("salary=" + salary+";");
}
result.close();
stmt.close();
// 4、关闭数据库
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/resultsetdemo01/ResultSetDemo02.java
package wf.network.resultsetdemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Date;
public class ResultSetDemo02 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null ; // 表示数据库的更新操作
ResultSet result = null; //表示
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需要通过Connection接口进行实例化操作
stmt = conn.createStatement() ;
// 执行SQL语句，更新数据库
result = stmt.executeQuery("SELECT pid,name,age,birthday,salary FROM person");
while(result.next()){// 是否有下一行数据
int pid = result.getInt(1) ;
String name = result.getString(2) ;
int age = result.getInt(3) ;
Date birthday = result.getDate(4) ;
float salary = result.getFloat(5) ;
System.out.print("pid = " + pid + "；") ;
System.out.print("name = " + name + "；") ;
System.out.print("age = " + age + "；") ;
System.out.print("birthday = " + birthday + "；") ;
System.out.println("salary = " + salary + "；") ;
}
result.close();
stmt.close();
// 4、关闭数据库
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/trandemo01/TransactionDemo01.java
package wf.network.trandemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class TransactionDemo01 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:ORCL";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null; // 表示数据库的更新操作
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
conn.setAutoCommit(false) ; // 取消自动提交
// 3、Statement接口需要通过Connection接口进行实例化操作
stmt = conn.createStatement() ;
try{
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'张三',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'李四',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'王'五',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'赵六',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'孙七',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
// 执行SQL语句，更新数据库
int i[] = stmt.executeBatch() ;
System.out.println(i.length);
conn.commit() ;// 提交
}catch(Exception e){
conn.rollback() ;// 回滚
}
// 4、关闭数据库
stmt.close() ;
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/updatedemo01/StatementDemo01.java
package wf.network.updatedemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class StatementDemo01 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null ; // 表示数据库的更新操作
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需要通过Connection接口进行实例化操作
stmt = conn.createStatement() ;
// 执行SQL语句，更新数据库
stmt.executeUpdate("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'张三',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
// 4、关闭数据库
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/updatedemo01/StatementDemo02.java
package wf.network.updatedemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class StatementDemo02 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null ; // 表示数据库的更新操作
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
stmt = conn.createStatement() ;
// 执行SQL语句，更新数据库
stmt.executeUpdate("UPDATE person SET name='李四', age=33,birthday=sysdate,salary=8000.0 WHERE pid=2 ") ;
// 4、关闭数据库
conn.close();
}
}
./ch23/JDBCproject1.0/wf/network/updatedemo01/StatementDemo03.java
package wf.network.updatedemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class StatementDemo03 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "wangfei";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null ; // 表示数据库的更新操作
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
stmt = conn.createStatement() ;
// 执行SQL语句，更新数据库
stmt.executeUpdate("DELETE FROM person WHERE pid=4 ") ;
// 4、关闭数据库
conn.close();
}
}
./ch23/���渚�23-10/浠ｇ��23-10.java
package wf.network.prepareddemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.Date;
public class InsertDemo {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
PreparedStatement pstmt = null; // 表示数据库的更新操作
InputData input = new InputData() ;
String name = input.getString("请输入姓名：");
int age = input.getInt("请输入年龄：", "年龄必须是数字，");
Date date = input.getDate("请输入生日：","输入的不是日期，");
float salary = input.getFloat("请输入工资：", "输入的工资必须是数字，");
String sql = "INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,?,?,?,?) ";
System.out.println(sql) ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、PreparedStatement接口需要通过Connection接口进行实例化操作
pstmt = conn.prepareStatement(sql) ;// 使用预处理的方式创建对象
pstmt.setString(1, name) ;// 第一个？号的内容
pstmt.setInt(2, age) ; // 第二个？号的内容
pstmt.setDate(3, new java.sql.Date(date.getTime())) ;
pstmt.setFloat(4,salary) ;
// 执行SQL语句，更新数据库
pstmt.executeUpdate();
// 4、关闭数据库
pstmt.close() ;
conn.close();
}
}
./ch23/���渚�23-11/浠ｇ��23-11.java
package wf.network.prepareddemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Date;
public class SelectDemo01 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
PreparedStatement pstmt = null ; // 表示数据库的更新操作
ResultSet result = null ;// 表示接收数据库的查询结果
String sql = "SELECT pid,name,age,birthday,salary FROM person" ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、PreparedStatement接口需要通过Connection接口进行实例化操作
pstmt = conn.prepareStatement(sql) ;
// 执行SQL语句，查询数据库
result = pstmt.executeQuery() ;
while(result.next()){// 是否有下一行数据
int pid = result.getInt(1) ;
String name = result.getString(2) ;
int age = result.getInt(3) ;
Date birthday = result.getDate(4) ;
float salary = result.getFloat(5) ;
System.out.print("pid = " + pid + "；") ;
System.out.print("name = " + name + "；") ;
System.out.print("age = " + age + "；") ;
System.out.print("birthday = " + birthday + "；") ;
System.out.println("salary = " + salary + "；") ;
}
// 4、关闭数据库
result.close() ;
pstmt.close() ;
conn.close();
}
}
./ch23/���渚�23-12/浠ｇ��23-12.java
package wf.network.prepareddemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Date;
public class SelectDemo02 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
PreparedStatement pstmt = null ; // 表示数据库的更新操作
ResultSet result = null ;// 表示接收数据库的查询结果
String keyWord = "" ;
String sql = "SELECT pid,name,age,birthday,salary FROM person WHERE name LIKE ? OR birthday LIKE ?" ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、PreparedStatement接口需要通过Connection接口进行实例化操作
pstmt = conn.prepareStatement(sql) ;
pstmt.setString(1,"%"+keyWord+"%") ;
pstmt.setString(2,"%"+keyWord+"%") ;
// 执行SQL语句，查询数据库
result = pstmt.executeQuery() ;
while(result.next()){// 是否有下一行数据
int pid = result.getInt(1) ;
String name = result.getString(2) ;
int age = result.getInt(3) ;
Date birthday = result.getDate(4) ;
float salary = result.getFloat(5) ;
System.out.print("pid = " + pid + "；") ;
System.out.print("name = " + name + "；") ;
System.out.print("age = " + age + "；") ;
System.out.print("birthday = " + birthday + "；") ;
System.out.println("salary = " + salary + "；") ;
}
// 4、关闭数据库
result.close() ;
pstmt.close() ;
conn.close();
}
}
./ch23/���渚�23-13/浠ｇ��23-13.java
package wf.network.prepareddemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
public class BatchInsertDemo {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
PreparedStatement pstmt = null; // 表示数据库的更新操作
String sql = "INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,?,?,?,?) ";
System.out.println(sql) ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、PreparedStatement接口需要通过Connection接口进行实例化操作
pstmt = conn.prepareStatement(sql) ;// 使用预处理的方式创建对象
for(int i=0;i<10;i++){
pstmt.setString(1, "lxh-" + i);// 第一个？号的内容
pstmt.setInt(2, 20 + i); // 第二个？号的内容
pstmt.setDate(3, new java.sql.Date(new java.util.Date().getTime()));
pstmt.setFloat(4, 900*i);
pstmt.addBatch() ; // 增加批处理
}
// 执行SQL语句，更新数据库
int i[] = pstmt.executeBatch() ;
System.out.println(i.length);
// 4、关闭数据库
pstmt.close() ;
conn.close();
}
}
./ch23/���渚�23-14/浠ｇ��23-14.java
package wf.network.trandemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class TransactionDemo02 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:ORCL";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null; // 表示数据库的更新操作
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
conn.setAutoCommit(false) ; // 取消自动提交
// 3、Statement接口需要通过Connection接口进行实例化操作
stmt = conn.createStatement() ;
try{
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'张三',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'李四',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'王'五',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'赵六',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
stmt.addBatch("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'孙七',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
// 执行SQL语句，更新数据库
int i[] = stmt.executeBatch() ;
System.out.println(i.length);
conn.commit() ;// 提交
}catch(Exception e){
conn.rollback() ;// 回滚
}
// 4、关闭数据库
stmt.close() ;
conn.close();
}
}
./ch23/���渚�23-15/浠ｇ��23-15.java
package org.lxh.mysqldemo;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.text.SimpleDateFormat;
import java.util.Date;
public class JDBCMySQL {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "org.gjt.mm.mysql.Driver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:mysql://localhost:3306/orcl";
// 连接数据库的用户名
public static final String DBUSER = "root";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
PreparedStatement pstmt = null;
// 表示数据库的更新操作
String name = "张三";
int age = 30;
Date date = new SimpleDateFormat("yyyy-MM-dd").parse("1983-02-15");
float salary = 7000.0f;
String sql = "INSERT INTO person(name,age,birthday,salary) VALUES
(?,?,?,?) ";
System.out.println(sql) ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、PreparedStatement接口需要通过Connection接口进行实例化操作
pstmt = conn.prepareStatement(sql) ;// 使用预处理的方式创建对象
pstmt.setString(1, name) ;// 第一个？号的内容
pstmt.setInt(2, age) ; // 第二个？号的内容
pstmt.setDate(3, new java.sql.Date(date.getTime())) ;
pstmt.setFloat(4,salary) ;
// 执行SQL语句，更新数据库
pstmt.executeUpdate();
// 4、关闭数据库
pstmt.close() ;
conn.close();
}
}
./ch23/���渚�23-2/浠ｇ��23-2.java
package wf.network.JDBCproject01;
import java.sql.Connection;
import java.sql.DriverManager;
public class ConnectJDBC {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
System.out.println(conn);
// 4、关闭数据库
conn.close();
}
}
./ch23/���渚�23-3/浠ｇ��23-3.java
package wf.network.updatedemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class StatementDemo01 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null ; // 表示数据库的更新操作
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需要通过Connection接口进行实例化操作
stmt = conn.createStatement() ;
// 执行SQL语句，更新数据库
stmt.executeUpdate("INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'张三',30,TO_DATE('1995-02-14','yyyy-mm-dd'),9000.0) ") ;
// 4、关闭数据库
conn.close();
}
}./ch23/���渚�23-4/浠ｇ��23-4.java
package wf.network.updatedemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class StatementDemo02 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null ; // 表示数据库的更新操作
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
stmt = conn.createStatement() ;
// 执行SQL语句，更新数据库
stmt.executeUpdate("UPDATE person SET name='李四', age=33,birthday=sysdate,salary=8000.0 WHERE pid=1 ") ;
// 4、关闭数据库
conn.close();
}
}
./ch23/���渚�23-5/浠ｇ��23-5.java
package wf.network.updatedemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class StatementDemo03 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null ; // 表示数据库的更新操作
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
stmt = conn.createStatement() ;
// 执行SQL语句，更新数据库
stmt.executeUpdate("DELETE FROM person WHERE pid=4 ") ;
// 4、关闭数据库
conn.close();
}
}./ch23/���渚�23-6/浠ｇ��23-6.java
package wf.network.resultsetdemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Date;
public class ResultSetDemo01 {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null ; // 表示数据库的更新操作
ResultSet result = null; //表示
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需要通过Connection接口进行实例化操作
stmt = conn.createStatement() ;
// 执行SQL语句，更新数据库
result = stmt.executeQuery("SELECT pid,name,age,birthday,salary FROM person");
while (result.next()){ // 是否有下一行信息
int pid = result.getInt("pid") ;
String name = result.getString("name");
int age = result.getInt("age");
Date birthday = result.getDate("birthday");
float salary = result.getFloat("salary");
System.out.print("pid=" + pid+";");
System.out.print("name=" + name+";");
System.out.print("age=" + age+";");
System.out.print("birthday=" + birthday+";");
System.out.println("salary=" + salary+";");
}
result.close();
stmt.close();
// 4、关闭数据库
conn.close();
}
}
./ch23/���渚�23-8/浠ｇ��23-8.java
package wf.network.execdemo01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class InsertDemo {
// 驱动程序就是之前在classpath中配置的jdbc的驱动程序的jar包中
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
// 连接数据库的用户名
public static final String DBUSER = "system";
// 连接数据库的密码
public static final String DBPASS = "java";
public static void main(String[] args) throws Exception {
Connection conn = null; // 表示数据库的连接的对象
Statement stmt = null; // 表示数据库的更新操作
InputData input = new InputData() ;
String name = input.getString("请输入姓名：");
int age = input.getInt("请输入年龄：", "年龄必须是数字，");
String date = input.getString("请输入生日：");
float salary = input.getFloat("请输入工资：", "输入的工资必须是数字，");
String sql = "INSERT INTO person(pid,name,age,birthday,salary) VALUES (perseq.nextval,'"
+ name + "'," + age + ",TO_DATE('"
+ date + "','yyyy-mm-dd')," + salary + ") ";
System.out.println(sql) ;
// 1、使用Class类加载驱动程序
Class.forName(DBDRIVER);
// 2、连接数据库
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需要通过Connection接口进行实例化操作
stmt = conn.createStatement();
// 执行SQL语句，更新数据库
stmt.executeUpdate(sql);
// 4、关闭数据库
conn.close();
}
}
./ch24/FiveChessProject/org/liky/game/frame/FiveChessFrame.java
package org.liky.game.frame;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class FiveChessFrame extends JFrame implements MouseListener, Runnable {
// 取得屏幕的宽度
int width = Toolkit.getDefaultToolkit().getScreenSize().width;
// 取得屏幕的高度
int height = Toolkit.getDefaultToolkit().getScreenSize().height;
// 背景图片
BufferedImage bgImage = null;
// 保存棋子的坐标
int x = 0;
int y = 0;
// 保存之前下过的全部棋子的坐标
// 其中数据内容 0： 表示这个点并没有棋子， 1： 表示这个点是黑子， 2：表示这个点是白子
int[][] allChess = new int[19][19];
// 标识当前应该黑棋还是白棋下下一步
boolean isBlack = true;
// 标识当前游戏是否可以继续
boolean canPlay = true;
// 保存显示的提示信息
String message = "黑方先行";
// 保存最多拥有多少时间(秒)
int maxTime = 0;
// 做倒计时的线程类
Thread t = new Thread(this);
// 保存黑方与白方的剩余时间
int blackTime = 0;
int whiteTime = 0;
// 保存双方剩余时间的显示信息
String blackMessage = "无限制";
String whiteMessage = "无限制";
public FiveChessFrame() {
// 设置标题
this.setTitle("五子棋");
// 设置窗体大小
this.setSize(500, 500);
// 设置窗体出现位置
this.setLocation((width - 500) / 2, (height - 500) / 2);
// 将窗体设置为大小不可改变
this.setResizable(false);
// 将窗体的关闭方式设置为默认关闭后程序结束
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 为窗体加入监听器
this.addMouseListener(this);
// 将窗体显示出来
this.setVisible(true);
t.start();
t.suspend();
String imagePath = "" ;
try {
imagePath = System.getProperty("user.dir")+"/bin/image/background.jpg" ;
bgImage = ImageIO.read(new File(imagePath.replaceAll("\\\\", "/")));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 刷新屏幕,防止开始游戏时出现无法显示的情况.
this.repaint();
}
public void paint(Graphics g) {
// 双缓冲技术防止屏幕闪烁
BufferedImage bi = new BufferedImage(500, 500,
BufferedImage.TYPE_INT_RGB);
Graphics g2 = bi.createGraphics();
g2.setColor(Color.BLACK);
// 绘制背景
g2.drawImage(bgImage, 1, 20, this);
// 输出标题信息
g2.setFont(new Font("黑体", Font.BOLD, 20));
g2.drawString("游戏信息：" + message, 130, 60);
// 输出时间信息
g2.setFont(new Font("宋体", 0, 14));
g2.drawString("黑方时间：" + blackMessage, 30, 470);
g2.drawString("白方时间：" + whiteMessage, 260, 470);
// 绘制棋盘
for (int i = 0; i < 19; i++) {
g2.drawLine(10, 70 + 20 * i, 370, 70 + 20 * i);
g2.drawLine(10 + 20 * i, 70, 10 + 20 * i, 430);
}
// 标注点位
g2.fillOval(68, 128, 4, 4);
g2.fillOval(308, 128, 4, 4);
g2.fillOval(308, 368, 4, 4);
g2.fillOval(68, 368, 4, 4);
g2.fillOval(308, 248, 4, 4);
g2.fillOval(188, 128, 4, 4);
g2.fillOval(68, 248, 4, 4);
g2.fillOval(188, 368, 4, 4);
g2.fillOval(188, 248, 4, 4);
/*
* //绘制棋子 x = (x - 10) / 20 * 20 + 10 ; y = (y - 70) / 20 * 20 + 70 ;
* //黑子 g.fillOval(x - 7, y - 7, 14, 14); //白子 g.setColor(Color.WHITE) ;
* g.fillOval(x - 7, y - 7, 14, 14); g.setColor(Color.BLACK) ;
* g.drawOval(x - 7, y - 7, 14, 14);
*/
// 绘制全部棋子
for (int i = 0; i < 19; i++) {
for (int j = 0; j < 19; j++) {
if (allChess[i][j] == 1) {
// 黑子
int tempX = i * 20 + 10;
int tempY = j * 20 + 70;
g2.fillOval(tempX - 7, tempY - 7, 14, 14);
}
if (allChess[i][j] == 2) {
// 白子
int tempX = i * 20 + 10;
int tempY = j * 20 + 70;
g2.setColor(Color.WHITE);
g2.fillOval(tempX - 7, tempY - 7, 14, 14);
g2.setColor(Color.BLACK);
g2.drawOval(tempX - 7, tempY - 7, 14, 14);
}
}
}
g.drawImage(bi, 0, 0, this);
}
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
/*
* System.out.println("X:"+e.getX()); System.out.println("Y:"+e.getY());
*/
if (canPlay == true) {
x = e.getX();
y = e.getY();
if (x >= 10 && x <= 370 && y >= 70 && y <= 430) {
x = (x - 10) / 20;
y = (y - 70) / 20;
if (allChess[x][y] == 0) {
// 判断当前要下的是什么颜色的棋子
if (isBlack == true) {
allChess[x][y] = 1;
isBlack = false;
message = "轮到白方";
} else {
allChess[x][y] = 2;
isBlack = true;
message = "轮到黑方";
}
// 判断这个棋子是否和其他的棋子连成5连，即判断游戏是否结束
boolean winFlag = this.checkWin();
if (winFlag == true) {
JOptionPane.showMessageDialog(this, "游戏结束,"
+ (allChess[x][y] == 1 ? "黑方" : "白方") + "获胜！");
canPlay = false;
}
} else {
JOptionPane.showMessageDialog(this, "当前位置已经有棋子，请重新落子！");
}
this.repaint();
}
}
/* System.out.println(e.getX() + " -- " + e.getY()); */
// 点击 开始游戏 按钮
if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 70
&& e.getY() <= 100) {
int result = JOptionPane.showConfirmDialog(this, "是否重新开始游戏?");
if (result == 0) {
// 现在重新开始游戏
// 重新开始所要做的操作: 1)把棋盘清空,allChess这个数组中全部数据归0.
// 2) 将 游戏信息: 的显示改回到开始位置
// 3) 将下一步下棋的改为黑方
for (int i = 0; i < 19; i++) {
for (int j = 0; j < 19; j++) {
allChess[i][j] = 0;
}
}
// 另一种方式 allChess = new int[19][19];
message = "黑方先行";
isBlack = true;
blackTime = maxTime;
whiteTime = maxTime;
if (maxTime > 0) {
blackMessage = maxTime / 3600 + ":"
+ (maxTime / 60 - maxTime / 3600 * 60) + ":"
+ (maxTime - maxTime / 60 * 60);
whiteMessage = maxTime / 3600 + ":"
+ (maxTime / 60 - maxTime / 3600 * 60) + ":"
+ (maxTime - maxTime / 60 * 60);
t.resume();
} else {
blackMessage = "无限制";
whiteMessage = "无限制";
}
this.canPlay = true;
this.repaint();
}
}
// 点击 游戏设置 按钮
if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 120
&& e.getY() <= 150) {
String input = JOptionPane
.showInputDialog("请输入游戏的最大时间(单位:分钟),如果输入0,表示没有时间限制:");
try {
maxTime = Integer.parseInt(input) * 60;
if (maxTime < 0) {
JOptionPane.showMessageDialog(this, "请输入正确信息,不允许输入负数!");
}
if (maxTime == 0) {
int result = JOptionPane.showConfirmDialog(this,
"设置完成,是否重新开始游戏?");
if (result == 0) {
for (int i = 0; i < 19; i++) {
for (int j = 0; j < 19; j++) {
allChess[i][j] = 0;
}
}
// 另一种方式 allChess = new int[19][19];
message = "黑方先行";
isBlack = true;
blackTime = maxTime;
whiteTime = maxTime;
blackMessage = "无限制";
whiteMessage = "无限制";
this.canPlay = true;
this.repaint();
}
}
if (maxTime > 0) {
int result = JOptionPane.showConfirmDialog(this,
"设置完成,是否重新开始游戏?");
if (result == 0) {
for (int i = 0; i < 19; i++) {
for (int j = 0; j < 19; j++) {
allChess[i][j] = 0;
}
}
// 另一种方式 allChess = new int[19][19];
message = "黑方先行";
isBlack = true;
blackTime = maxTime;
whiteTime = maxTime;
blackMessage = maxTime / 3600 + ":"
+ (maxTime / 60 - maxTime / 3600 * 60) + ":"
+ (maxTime - maxTime / 60 * 60);
whiteMessage = maxTime / 3600 + ":"
+ (maxTime / 60 - maxTime / 3600 * 60) + ":"
+ (maxTime - maxTime / 60 * 60);
t.resume();
this.canPlay = true;
this.repaint();
}
}
} catch (NumberFormatException e1) {
// TODO Auto-generated catch block
JOptionPane.showMessageDialog(this, "请正确输入信息!");
}
}
// 点击 游戏说明 按钮
if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 170
&& e.getY() <= 200) {
JOptionPane.showMessageDialog(this,
"这个一个五子棋游戏程序，黑白双方轮流下棋，当某一方连到五子时，游戏结束。");
}
// 点击 认输 按钮
if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 270
&& e.getY() <= 300) {
int result = JOptionPane.showConfirmDialog(this, "是否确认认输?");
if (result == 0) {
if (isBlack) {
JOptionPane.showMessageDialog(this, "黑方已经认输,游戏结束!");
} else {
JOptionPane.showMessageDialog(this, "白方已经认输,游戏结束!");
}
canPlay = false;
}
}
// 点击 关于 按钮
if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 320
&& e.getY() <= 350) {
JOptionPane.showMessageDialog(this,
"本游戏由MLDN制作，有相关问题可以访问www.mldn.cn");
}
// 点击 退出 按钮
if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 370
&& e.getY() <= 400) {
JOptionPane.showMessageDialog(this, "游戏结束");
System.exit(0);
}
}
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}
private boolean checkWin() {
boolean flag = false;
// 保存共有相同颜色多少棋子相连
int count = 1;
// 判断横向是否有5个棋子相连，特点 纵坐标 是相同， 即allChess[x][y]中y值是相同
int color = allChess[x][y];
/*
* if (color == allChess[x+1][y]) { count++; if (color ==
* allChess[x+2][y]) { count++; if (color == allChess[x+3][y]) {
* count++; } } }
*/
// 通过循环来做棋子相连的判断
/*
* int i = 1; while (color == allChess[x + i][y + 0]) { count++; i++; }
* i = 1; while (color == allChess[x - i][y - 0]) { count++; i++; } if
* (count >= 5) { flag = true; } // 纵向的判断 int i2 = 1 ; int count2 = 1 ;
* while (color == allChess[x + 0][y + i2]) { count2++; i2++; } i2 = 1;
* while (color == allChess[x - 0][y - i2]) { count2++; i2++; } if
* (count2 >= 5) { flag = true ; } // 斜方向的判断（右上 + 左下） int i3 = 1 ; int
* count3 = 1 ; while (color == allChess[x + i3][y - i3]) { count3++;
* i3++; } i3 = 1; while (color == allChess[x - i3][y + i3]) { count3++;
* i3++; } if (count3 >= 5) { flag = true ; } // 斜方向的判断（右下 + 左上） int i4 =
* 1 ; int count4 = 1 ; while (color == allChess[x + i4][y + i4]) {
* count4++; i4++; } i4 = 1; while (color == allChess[x - i4][y - i4]) {
* count4++; i4++; } if (count4 >= 5) { flag = true ; }
*/
// 判断横向
count = this.checkCount(1, 0, color);
if (count >= 5) {
flag = true;
} else {
// 判断纵向
count = this.checkCount(0, 1, color);
if (count >= 5) {
flag = true;
} else {
// 判断右上、左下
count = this.checkCount(1, -1, color);
if (count >= 5) {
flag = true;
} else {
// 判断右下、左上
count = this.checkCount(1, 1, color);
if (count >= 5) {
flag = true;
}
}
}
}
return flag;
}
// 判断棋子连接的数量
private int checkCount(int xChange, int yChange, int color) {
int count = 1;
int tempX = xChange;
int tempY = yChange;
while (x + xChange >= 0 && x + xChange <= 18 && y + yChange >= 0
&& y + yChange <= 18
&& color == allChess[x + xChange][y + yChange]) {
count++;
if (xChange != 0)
xChange++;
if (yChange != 0) {
if (yChange > 0)
yChange++;
else {
yChange--;
}
}
}
xChange = tempX;
yChange = tempY;
while (x - xChange >= 0 && x - xChange <= 18 && y - yChange >= 0
&& y - yChange <= 18
&& color == allChess[x - xChange][y - yChange]) {
count++;
if (xChange != 0)
xChange++;
if (yChange != 0) {
if (yChange > 0)
yChange++;
else {
yChange--;
}
}
}
return count;
}
public void run() {
// TODO Auto-generated method stub
// 判断是否有时间限制
if (maxTime > 0) {
while (true) {
if (isBlack) {
blackTime--;
if (blackTime == 0) {
JOptionPane.showMessageDialog(this, "黑方超时,游戏结束!");
}
} else {
whiteTime--;
if (whiteTime == 0) {
JOptionPane.showMessageDialog(this, "白方超时,游戏结束!");
}
}
blackMessage = blackTime / 3600 + ":"
+ (blackTime / 60 - blackTime / 3600 * 60) + ":"
+ (blackTime - blackTime / 60 * 60);
whiteMessage = whiteTime / 3600 + ":"
+ (whiteTime / 60 - whiteTime / 3600 * 60) + ":"
+ (whiteTime - whiteTime / 60 * 60);
this.repaint();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(blackTime + " -- " + whiteTime);
}
}
}
}
./ch24/FiveChessProject/org/liky/game/test/Test.java
package org.liky.game.test;
import org.liky.game.frame.FiveChessFrame;
public class Test {
public static void main(String[] args) {
FiveChessFrame ff = new FiveChessFrame();
}
}
./ch24/浠ｇ��24-1.java
package org.liky.game;
import javax.swing.JFrame;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自动生成方法存根
JFrame jf = new JFrame();
jf.setVisible(true);
}
}
./ch24/浠ｇ��24-2.java
package org.liky.game;
import javax.swing.JFrame;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自动生成方法存根
JFrame jf = new JFrame();
jf.setVisible(true);
jf.setTitle("五子棋");
jf.setSize(200,100);
jf.setLocation(200,100);
}
}
./ch24/浠ｇ��24-3.java
package org.liky.game;
import javax.swing.JFrame;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自动生成方法存根
JFrame jf = new JFrame();
jf.setVisible(true);
jf.setTitle("五子棋");
jf.setSize(200,100);
jf.setLocation(200,100);
jf.setResizable(false);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
./ch24/浠ｇ��24-4.java
package org.liky.game;
import java.awt.Toolkit;
import javax.swing.JFrame;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自动生成方法存根
JFrame jf = new JFrame();
jf.setVisible(true);
jf.setTitle("五子棋");
jf.setSize(200,100);
jf.setLocation(200,100);
jf.setResizable(false);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
int width = Toolkit.getDefaultToolkit().getScreenSize().width;
int height = Toolkit.getDefaultToolkit().getScreenSize().height;
System.out.println("宽度为："+ width);
System.out.println("高度为："+ height);
}
}
./ch24/浠ｇ��24-5.java
package org.liky.game;
import java.awt.Toolkit;
import javax.swing.JFrame;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自动生成方法存根
JFrame jf = new JFrame();
jf.setVisible(true);
jf.setTitle("五子棋");
jf.setSize(200,100);
//jf.setLocation(200,100);
jf.setResizable(false);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
int width = Toolkit.getDefaultToolkit().getScreenSize().width;
int height = Toolkit.getDefaultToolkit().getScreenSize().height;
System.out.println("宽度为："+ width);
System.out.println("高度为："+ height);
jf.setLocation((width-200)/2,(height-100)/2);
}
}
./ch24/浠ｇ��24-6.java
package org.liky.game.test;
import org.liky.game.frame.FiveChessFrame;
public class Test {
public static void main(String[] args) {
FiveChessFrame ff = new FiveChessFrame();
}
}
./ch24/浠ｇ��24-7.java
package org.liky.game.frame;
import java.awt.Toolkit;
import javax.swing.JFrame;
public class FiveChessFrame extends JFrame {
// 取得屏幕的宽度
int width = Toolkit.getDefaultToolkit().getScreenSize().width;
// 取得屏幕的高度
int height = Toolkit.getDefaultToolkit().getScreenSize().height;
public FiveChessFrame() {
// 设置标题
this.setTitle("五子棋");
// 设置窗体大小
this.setSize(500, 500);
// 设置窗体出现位置
this.setLocation((width - 500) / 2, (height - 500) / 2);
// 将窗体设置为大小不可改变
this.setResizable(false);
// 将窗体的关闭方式设置为默认关闭后程序结束
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 将窗体显示出来
this.setVisible(true);
}
}
./ch24/浠ｇ��24-8.java
package org.liky.game;
import java.awt.Toolkit;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import org.liky.game.frame.FiveChessFrame;
public class Test {
public static void main(String[] args) {
FiveChessFrame ff = new FiveChessFrame();
JOptionPane.showMessageDialog(ff, "我的信息");
int result=JOptionPane.showConfirmDialog(ff,"我的确认信息：现在要开始游戏吗？" );
if (result == 0){
JOptionPane.showMessageDialog(ff, "游戏开始");
}
if (result == 1){
JOptionPane.showMessageDialog(ff, "游戏结束");
}
if (result == 2){
JOptionPane.showMessageDialog(ff, "请重新选择");
}
String username = JOptionPane.showInputDialog("请输入你的姓名： ");
if (username != null ){
System.out.println(username);
JOptionPane.showMessageDialog(ff,"输入的姓名为： " + username );
}else {
JOptionPane.showMessageDialog(ff, "请重新输入你的姓名！");
}
}
}
./ch24/浠ｇ��24-9.java
package org.liky.game.frame;
import java.awt.HeadlessException;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class FiveChessFrame extends JFrame implements MouseListener {
// 取得屏幕的宽度
int width = Toolkit.getDefaultToolkit().getScreenSize().width;
// 取得屏幕的高度
int height = Toolkit.getDefaultToolkit().getScreenSize().height;
// 保存棋子的坐标
int x = 0;
int y = 0;
// 保存之前下过的全部棋子的坐标
// 其中数据内容 0： 表示这个点并没有棋子， 1： 表示这个点是黑子， 2：表示这个点是白子
int[][] allChess = new int[19][19];
// 标识当前应该黑棋还是白棋下下一步
boolean isBlack = true;
// 标识当前游戏是否可以继续
boolean canPlay = true;
// 保存显示的提示信息
String message = "黑方先行";
// 保存最多拥有多少时间(秒)
int maxTime = 0;
// 保存黑方与白方的剩余时间
int blackTime = 0;
int whiteTime = 0;
// 保存双方剩余时间的显示信息
String blackMessage = "无限制";
String whiteMessage = "无限制";
public FiveChessFrame() throws HeadlessException {
// 设置标题
this.setTitle("五子棋");
// 设置窗体大小
this.setSize(500, 500);
// 设置窗体出现位置
this.setLocation((width - 500) / 2, (height - 500) / 2);
// 将窗体设置为大小不可改变
this.setResizable(false);
// 将窗体的关闭方式设置为默认关闭后程序结束
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 为窗体加入监听器
this.addMouseListener(this);
// 将窗体显示出来
this.setVisible(true);
}
public void mouseClicked(MouseEvent arg0) {
// TODO 自动生成方法存根
JOptionPane.showMessageDialog(this,"鼠标单击");
}
public void mouseEntered(MouseEvent arg0) {
// TODO 自动生成方法存根
}
public void mouseExited(MouseEvent arg0) {
// TODO 自动生成方法存根
}
public void mousePressed(MouseEvent arg0) {
// TODO 自动生成方法存根
}
public void mouseReleased(MouseEvent arg0) {
// TODO 自动生成方法存根
}
}
./ch25/InfoProject/src/org/lxh/info/dao/impl/IPersonDAOImpl.java
package org.lxh.info.dao.impl;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import org.lxh.info.dao.IPersonDAO;
import org.lxh.info.vo.Person;
public class IPersonDAOImpl implements IPersonDAO {
private Connection conn = null;
public IPersonDAOImpl(Connection conn) {
this.conn = conn;
}
public boolean doCreate(Person person) throws Exception {
boolean flag = false;
PreparedStatement pstmt = null;
String sql = "INSERT INTO person(pid,name,age,birthday,address)"
+ " VALUES (myseq.nextval,?,?,?,?)";
try {
pstmt = this.conn.prepareStatement(sql);
pstmt.setString(1, person.getName());
pstmt.setInt(2, person.getAge());
pstmt.setDate(3, new java.sql.Date(person.getBirthday().getTime()));
pstmt.setString(4, person.getAddress());
int len = pstmt.executeUpdate();
if (len > 0) {
flag = true;
}
} catch (Exception e) {
throw e;
} finally {
try {
pstmt.close();
} catch (Exception e) {
throw e;
}
}
return flag;
}
public boolean doDelete(int pid) throws Exception {
boolean flag = false;
PreparedStatement pstmt = null;
String sql = "DELETE FROM person WHERE pid=?";
try {
pstmt = this.conn.prepareStatement(sql);
pstmt.setInt(1, pid);
int len = pstmt.executeUpdate();
if (len > 0) {
flag = true;
}
} catch (Exception e) {
throw e;
} finally {
try {
pstmt.close();
} catch (Exception e) {
throw e;
}
}
return flag;
}
public boolean doUpdate(Person person) throws Exception {
boolean flag = false;
PreparedStatement pstmt = null;
String sql = "UPDATE person SET name=?,age=?,birthday=?,address=? WHERE pid=?";
try {
pstmt = this.conn.prepareStatement(sql);
pstmt.setString(1, person.getName());
pstmt.setInt(2, person.getAge());
pstmt.setDate(3, new java.sql.Date(person.getBirthday().getTime()));
pstmt.setString(4, person.getAddress());
pstmt.setInt(5, person.getPid());
int len = pstmt.executeUpdate();
if (len > 0) {
flag = true;
}
} catch (Exception e) {
throw e;
} finally {
try {
pstmt.close();
} catch (Exception e) {
throw e;
}
}
return flag;
}
public List<Person> findAll(String keyWord) throws Exception {
List<Person> all = new ArrayList<Person>();
PreparedStatement pstmt = null;
String sql = "SELECT pid,name,age,birthday,address FROM person "
+ "WHERE name LIKE ? OR age LIKE ? OR birthday LIKE ? OR address LIKE ?";
try {
pstmt = this.conn.prepareStatement(sql);
pstmt.setString(1, "%" + keyWord + "%"); // 模糊查询
pstmt.setString(2, "%" + keyWord + "%"); // 模糊查询
pstmt.setString(3, "%" + keyWord + "%"); // 模糊查询
pstmt.setString(4, "%" + keyWord + "%"); // 模糊查询
ResultSet rs = pstmt.executeQuery(); // 执行查询
Person per = null;
while (rs.next()) { // 如果有查询的结果，则可以向下执行
per = new Person();
per.setPid(rs.getInt(1));
per.setName(rs.getString(2));
per.setAge(rs.getInt(3));
per.setBirthday(rs.getDate(4));
per.setAddress(rs.getString(5));
all.add(per); // 向集合中插入内容
}
} catch (Exception e) {
throw e;
} finally {
try {
pstmt.close();
} catch (Exception e) {
throw e;
}
}
return all;
}
public Person findById(int pid) throws Exception {
Person per = null;
PreparedStatement pstmt = null;
String sql = "SELECT pid,name,age,birthday,address FROM person WHERE pid=?";
try {
pstmt = this.conn.prepareStatement(sql);
pstmt.setInt(1, pid);
ResultSet rs = pstmt.executeQuery(); // 执行查询
if (rs.next()) { // 如果有查询的结果，则可以向下执行
per = new Person();
per.setPid(rs.getInt(1));
per.setName(rs.getString(2));
per.setAge(rs.getInt(3));
per.setBirthday(rs.getDate(4));
per.setAddress(rs.getString(5));
}
} catch (Exception e) {
throw e;
} finally {
try {
pstmt.close();
} catch (Exception e) {
throw e;
}
}
return per;
}
}
./ch25/InfoProject/src/org/lxh/info/dao/IPersonDAO.java
package org.lxh.info.dao;
import java.util.List;
import org.lxh.info.vo.Person;
public interface IPersonDAO {
/**
* 数据库的增加操作
* @param person
* @return
* @throws Exception
*/
public boolean doCreate(Person person) throws Exception;
/**
* 数据库的修改操作
* @param person
* @return
* @throws Exception
*/
public boolean doUpdate(Person person) throws Exception;
/**
* 数据库的删除操作
* @param pid
* @return
* @throws Exception
*/
public boolean doDelete(int pid) throws Exception;
/**
* 根据ID查询数据库
* @param pid
* @return
* @throws Exception
*/
public Person findById(int pid) throws Exception;
/**
* 查询全部的记录
* @param keyWord
* @return
* @throws Exception
*/
public List<Person> findAll(String keyWord) throws Exception;
}
./ch25/InfoProject/src/org/lxh/info/dao/proxy/IPersonDAOProxy.java
package org.lxh.info.dao.proxy;
import java.util.List;
import org.lxh.info.dao.IPersonDAO;
import org.lxh.info.dao.impl.IPersonDAOImpl;
import org.lxh.info.dbc.DatabaseConnection;
import org.lxh.info.vo.Person;
public class IPersonDAOProxy implements IPersonDAO {
private DatabaseConnection dbc = null;
private IPersonDAO dao = null;
public IPersonDAOProxy() {
this.dbc = new DatabaseConnection();
this.dao = new IPersonDAOImpl(this.dbc.getConnection());
}
public boolean doCreate(Person person) throws Exception {
boolean flag = false;
try {
flag = this.dao.doCreate(person);
} catch (Exception e) {
throw e;
} finally {
this.dbc.close();
}
return flag;
}
public boolean doDelete(int pid) throws Exception {
boolean flag = false;
try {
flag = this.dao.doDelete(pid);
} catch (Exception e) {
throw e;
} finally {
this.dbc.close();
}
return flag;
}
public boolean doUpdate(Person person) throws Exception {
boolean flag = false;
try {
flag = this.dao.doUpdate(person);
} catch (Exception e) {
throw e;
} finally {
this.dbc.close();
}
return flag;
}
public List<Person> findAll(String keyWord) throws Exception {
List<Person> all = null;
try {
all = this.dao.findAll(keyWord);
} catch (Exception e) {
throw e;
} finally {
this.dbc.close();
}
return all;
}
public Person findById(int pid) throws Exception {
Person per = null;
try {
per = this.dao.findById(pid);
} catch (Exception e) {
throw e;
} finally {
this.dbc.close();
}
return per;
}
}
./ch25/InfoProject/src/org/lxh/info/dbc/DatabaseConnection.java
package org.lxh.info.dbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DatabaseConnection {
public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
public static final String DBUSER = "system";
public static final String DBPASSWORD = "root";
private Connection conn = null;
public DatabaseConnection() {
try {
Class.forName(DBDRIVER);
this.conn = DriverManager.getConnection(DBURL, DBUSER, DBPASSWORD);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
public Connection getConnection() {
return this.conn;
}
public void close() {
if (this.conn != null) {
try {
this.conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
./ch25/InfoProject/src/org/lxh/info/factory/DAOFactory.java
package org.lxh.info.factory;
import org.lxh.info.dao.IPersonDAO;
import org.lxh.info.dao.proxy.IPersonDAOProxy;
public class DAOFactory {
public static IPersonDAO getIPersonDAOInstance() {
return new IPersonDAOProxy();
}
}
./ch25/InfoProject/src/org/lxh/info/menu/Menu.java
package org.lxh.info.menu;
import org.lxh.info.operate.PersonOperate;
import org.lxh.info.util.InputData;
public class Menu {
public Menu() {
while (true) {
this.show();
}
}
public void show() { // 显示菜单
System.out.println("======== 人员管理系统 =========");
System.out.println("[1]、增加信息");
System.out.println("[2]、修改信息");
System.out.println("[3]、删除信息");
System.out.println("[4]、查看信息");
System.out.println("[5]、检索信息");
System.out.println("[0]、退出系统\n\n\n");
int ch = new InputData().getInt("请选择：", "选项必须是数字");
switch (ch) {
case 0: {
System.out.println("bye bye.");
System.exit(1);
}
case 1: {
PersonOperate.insert();
break;
}
case 2: {
PersonOperate.update();
break;
}
case 3: {
PersonOperate.delete();
break;
}
case 4: {
PersonOperate.findall();
break;
}
case 5: {
PersonOperate.search();
break;
}
default: {
System.out.println("请选择正确的选项。");
}
}
}
}
./ch25/InfoProject/src/org/lxh/info/operate/PersonOperate.java
package org.lxh.info.operate;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import org.lxh.info.factory.DAOFactory;
import org.lxh.info.util.InputData;
import org.lxh.info.vo.Person;
public class PersonOperate {
public static void insert() {
Person per = new Person();
InputData input = new InputData();
String name = input.getString("请输入人员的姓名：");
int age = input.getInt("请输入人员的年龄：", "年龄必须是数字，");
Date date = input.getDate("请输入人员的生日：", "输入的日期格式不正确，");
String address = input.getString("请输入人员的住址：");
per.setName(name);
per.setAddress(address);
per.setAge(age);
per.setBirthday(date);
try {
DAOFactory.getIPersonDAOInstance().doCreate(per);
System.out.println("人员信息增加成功！");
} catch (Exception e) {
System.out.println("人员信息增加失败！");
}
}
public static void update() {
// 在修改数据之前最好先将数据查询出来
Person per = null;
InputData input = new InputData();
int pid = input.getInt("请输入要修改人员的编号：", "编号必须是数字，");
try {
per = DAOFactory.getIPersonDAOInstance().findById(pid);
} catch (Exception e1) {
}
if (per != null) {
String name = input.getString("请输入新的人员的姓名（原姓名是：" + per.getName()
+ "）：");
int age = input.getInt("请输入新的人员的年龄（原年龄是：" + per.getAge() + "）：",
"年龄必须是数字，");
Date date = input.getDate("请输入新的人员的生日（原生日是：" + per.getBirthday()
+ "）：", "输入的日期格式不正确，");
String address = input.getString("请输入新的人员的住址（原住址是："
+ per.getAddress() + "）：");
per.setName(name);
per.setAddress(address);
per.setAge(age);
per.setBirthday(date);
try {
DAOFactory.getIPersonDAOInstance().doUpdate(per);
System.out.println("人员信息修改成功！");
} catch (Exception e) {
System.out.println("人员信息修改失败！");
}
} else {
System.out.println("没有此人员信息。");
}
}
public static void delete() {
InputData input = new InputData();
int pid = input.getInt("请输入要修改人员的编号：", "编号必须是数字，");
try {
DAOFactory.getIPersonDAOInstance().doDelete(pid);
System.out.println("人员信息删除成功！");
} catch (Exception e) {
System.out.println("人员信息删除失败！");
}
}
public static void findall() {
List<Person> all = null;
try {
all = DAOFactory.getIPersonDAOInstance().findAll("");
} catch (Exception e) {
e.printStackTrace() ;
}
Iterator<Person> iter = all.iterator();
while (iter.hasNext()) {
Person per = iter.next();
System.out.println(per.getPid() + "，" + per.getName() + "，"
+ per.getAge() + "，" + per.getBirthday() + "，"
+ per.getAddress());
}
}
public static void search() {
List<Person> all = null;
String kw = new InputData().getString("请输入检索的关键字：");
try {
all = DAOFactory.getIPersonDAOInstance().findAll(kw);
} catch (Exception e) {
}
Iterator<Person> iter = all.iterator();
while (iter.hasNext()) {
Person per = iter.next();
System.out.println(per.getPid() + "，" + per.getName() + "，"
+ per.getAge() + "，" + per.getBirthday() + "，"
+ per.getAddress());
}
}
}
./ch25/InfoProject/src/org/lxh/info/test/Test.java
package org.lxh.info.test;
import org.lxh.info.menu.Menu;
public class Test {
public static void main(String[] args) throws Exception {
new Menu();
}
}
./ch25/InfoProject/src/org/lxh/info/util/InputData.java
package org.lxh.info.util;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class InputData {
private Scanner scan = null; // 输入数据
public InputData() {
this.scan = new Scanner(System.in); // 输入数据实例化
}
public String getString(String info) {
String str = null;
System.out.print(info);
if (this.scan.hasNext()) {
str = this.scan.next(); // 接收内容
}
return str;
}
public int getInt(String info, String errMsg) {
int temp = 0;
System.out.print(info);
if (this.scan.hasNextInt()) {
temp = this.scan.nextInt(); // 接收内容
} else {
System.out.print(errMsg);
}
return temp;
}
public Date getDate(String info, String errMsg) {
java.util.Date date = null;
System.out.print(info);
if (this.scan.hasNext("\\d{4}-\\d{2}-\\d{2}")) {
String str = this.scan.next("\\d{4}-\\d{2}-\\d{2}");
try {
date = new SimpleDateFormat("yyyy-MM-dd").parse(str);
} catch (ParseException e) {
e.printStackTrace();
}
} else {
System.out.print(errMsg);
}
return date;
}
}
./ch25/InfoProject/src/org/lxh/info/vo/Person.java
package org.lxh.info.vo;
import java.util.Date;
public class Person { // 本类可以很好的映射一个表的数据
private int pid;
private String name;
private int age;
private Date birthday;
private String address;
public Person() {
super();
}
public Person(int pid, String name, int age, Date birthday, String address) {
super();
this.pid = pid;
this.name = name;
this.age = age;
this.birthday = birthday;
this.address = address;
}
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
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