import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; public class FileOutputStreamTest { public static void main(String[] args) { try { var fis = new FileInputStream("FileI…

Chapter 2 Learning Java language fundamentals exercises: 1.What  is Unicode? Unicode is a computing industry standard for consistently encoding,representing,and handling text that's expressed in most of world's writing system 2.What is a comment? A c…

import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.nio.channels.FileLock; public class FileLockTest { public static void main(String[] args) { try ( var channel = new FileOutputStream("a.txt…

public class Person implements java.io.Serializable { private String name; private transient int age; // 注意此处没有提供无参数的构造器! public Person(String name, int age) { System.out.println("有参数的构造器"); this.name = name; this.age = age; } // 省略name与age的sett…

对Person类实例进行序例化及反序例化: Person.java public class Person implements java.io.Serializable { private String name; private int age; // 注意此处没有提供无参数的构造器! public Person(String name, int age) { System.out.println("有参数的构造器"); this.name = name; this.age = a…

output redirectionOut: public class RedirectOut { public static void main(String[] args) throws FileNotFoundException { try { var ps = new PrintStream(new FileOutputStream("out.txt")); System.setOut(ps); System.out.println("普通字符串"); Sy…

有点重定向使用的味道 import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.PrintStream; public class PrintStreamTest { public static void main(String[] args) { try { var fos = new FileOutputStream("test.txt"); var ps = new…

曹海成的专栏 http://blog.csdn.net/caohaicheng/article/details/38071097 http://blog.csdn.net/a5489888/article/details/8278301 http://blog.csdn.net/fmh2011/article/details/39205759 http://blog.csdn.net/caohaicheng/article/details/38116481 java nio http://blo…

I/O Streams, it simplifies I/O operations, write a whole object out to stream & read back. File I/O and file system operations, including random access files. Classes about I/O Streams most are in java.io, about File I/O are in java.nio.file. I/O Str…

Java is using Unicode set Java is case sensitive Comments, C/C++ style abstract, const, final, int, public, throw, assert, continue, finally, interface, return, throws, boolean, default, float, long, short, transient, break, do, for, native, static,…