java新手笔记21 接口

1.接口

package com.yfs.javase;
 
public interface IDemo1 {//interface  接口
 
	public /*abstract*/ void method1();//默认抽象方法 public
 
}
 
class Child1 implements IDemo1 {
 
	@Override
	public void method1() {
		// 实现接口的方法
		System.out.println("call method1()");
	}
 
}

2.接口示例1

package com.yfs.javase;
 
public interface IFly {
 
	public void fly();
 
}

3.实现接口

package com.yfs.javase;
 
public class Bird implements IFly {
 
	@Override
	public void fly() {
		System.out.println("鸟在飞....");
 
	}
 
}
class Wuya  extends Bird {
	@Override
	public void fly() {
		System.out.println("乌鸦在飞....");
 
	}
}
 
class Butterfly implements IFly {
 
	@Override
	public void fly() {
		System.out.println("蝴蝶在飞....");
 
	}
 
}

4.IRun接口

package com.yfs.javase;
 
public interface IRun {
	int a = 10;//默认public static final
	public void run();
 
}
/*public*/ interface ISwim {
 
}
class Horse implements IRun {
 
	@Override
	public void run() {
 
		System.out.println("马在跑..." + a);
 
	}
 
}

5.接口多继承

package com.yfs.javase;
//接口可以多继承
public interface ITest extends IFly, IRun, ISwim {
 
}

6.Person

package com.yfs.javase;
 
public class Person {
 
	private String name;
	private int age;
	private char sex;
 
	public Person() {
 
	}
 
	public Person(String name) {
		this.name = name;
	}
 
	public Person(String name, int age, char sex) {
		this.name = name;
		this.age = age;
		this.sex = sex;
	}
 
	public void introduce() {
		System.out.println("I am Person....");
	}
 
	public String toString() {
		return "姓名：" + name + "  年龄 ：" + age + "  性别：" + sex;
	}
 
	public void speak() {
		System.out.println(name + " 工作了吗？");
	}
 
	public void sleep() {
		System.out.println(name + " 睡觉了吗？");
	}
 
	public void eat() {
		System.out.println(name + " 吃了吗？");
	}
 
	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 char getSex() {
		return sex;
	}
 
	public void setSex(char sex) {
		this.sex = sex;
	}
 
}

7.超人 继承 人，实现 IRun,IFly 接口

package com.yfs.javase;
 
public class SuperMan extends Person implements IRun, IFly {
 
	@Override
	public void run() {
		System.out.println("超人在跑....");
 
	}
 
	@Override
	public void fly() {
		System.out.println("超人在飞...");
 
	}
 
}

8.接口 测试

package com.yfs.javase;
 
public class Test1 {
 
	public static void main(String[] args) {
		IFly f1 = null;
		//		new IFly();//接口不能实例化
		f1 = new Bird();
		f1.fly();
		f1 = new Butterfly();
		f1.fly();
 
		callMethod(new Wuya());
 
		IRun r1 = new Horse();
		r1.run();
 
		callMethod(new SuperMan());
	}
 
	public static  void callMethod(IFly f) {
		f.fly();
	}
 
}

9.测试2

package com.yfs.javase;
 
public class Test2 {
 
	public static void main(String[] args) {
		SuperMan s1 = new SuperMan();
		s1.setName("Tom");
		s1.speak();
        s1.run();
 
        callMethod(new Horse());
        callMethod(s1);
	}
 
	public static void callMethod(IRun r) {
		r.run();
	}
}