代码全细节讲解有没有哇

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class InstantThread extends Thread{
final static File readFile = new File("D:\1.rar");
final static File writeFile = new File("E:\1.rar");
@Override
public void run() {
//被拷贝文件的大小
long length = readFile.length();
System.out.println("被拷贝的文件大小："+length+"B");
while (true) {
try {
sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
long currentLength = writeFile.length();
System.out.println("已拷贝："+currentLength+"B");
System.out.println("剩余："+(length - currentLength)+"B");
if (currentLength>=length) {
System.out.println("文件已经完成拷贝");
break;
}
}
}
public void copy(File in,File ot) throws IOException {
FileInputStream input = new FileInputStream(in);
FileOutputStream ouput = new FileOutputStream(ot);
int data = 0;
while ((data = input.read())!=-1) {
ouput.write(data);
}
input.close();
ouput.close();
}
public static void main(String[] args) {
InstantThread i = new InstantThread();
i.start();
try {
i.copy(readFile, writeFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}

很好 恭喜你掌握了 复制粘贴

package csdn005;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class InstantThread extends Thread{
    /**
     * 定义一个最终静态的读取文件对象
     */
    final static File readFile = new File("D:\1.rar");
    /**
     * 定义一个最终静态的写文件对象
     */
    final static File writeFile = new File("E:\1.rar");

    /**
     * 重写 Thread 类的 run 方法
     */
    @Override
    public void run() {
        //被拷贝文件的大小
        long length = readFile.length();
        System.out.println("被拷贝的文件大小：" + length + "B");
        // 循环
        while (true) {
            try {
                // 睡眠2秒
                sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            // 获取写文件的长度
            long currentLength = writeFile.length();
            System.out.println("已拷贝：" + currentLength + "B");
            System.out.println("剩余：" +  (length - currentLength) + "B");
            // 判断读取当前文件的大小是否大于原始文件大小
            if (currentLength >= length) {
                System.out.println("文件已经完成拷贝");
                // 读取当前文件的大小等于原始文件大小，就退出while
                break;
            }
        }
    }
    
    public void copy(File in,File ot) throws IOException {
        // 获取文件 in 的输入流
        FileInputStream input = new FileInputStream(in);
        // 获取文件 ot 的输入流
        FileOutputStream ouput = new FileOutputStream(ot);
        int data = 0;
        // 循环读取 input 流，直到读取完毕
        while ((data = input.read())!=-1) {
            // 将 input 流写给 output
            ouput.write(data);
        }
        // 流关闭
        input.close();
        ouput.close();
    }
    public static void main(String[] args) {
        InstantThread i = new InstantThread();
        i.start();
        try {
            i.copy(readFile, writeFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}