线程下载案例

package xiancheng;

import java.util.Random;

public class XunLei {

    public static void main(String[] args) throws InterruptedException {
    System.out.println("开始下载");
    
    
  MyTask t=new MyTask("大圣归来.mp4");
  MyTask t1=new MyTask("大圣走了.mp4");
  MyTask t2=new MyTask("大圣又来了.mp4");
  t.setName("猴哥");
  
  System.out.println(Thread.currentThread().getName());//或者getId
  
  
  t.start();
  t1.start();
  t2.start();
  
  t.join();//让主程序执行完毕出现在最末端
  t1.join();
  t2.join();
  
System.out.println("主线程执行完毕");
    }

}
//创建一个线程类（下载任务）
class MyTask extends Thread{
String taskName;

    public MyTask(String taskName) {
    super();
    this.taskName = taskName;
}
    Random r=new Random();
    //线程体；
    @Override
    public void run() {
    for(int i=1;i<=100;i++){
        System.out.println(Thread.currentThread().getName()+","+this.taskName+"下载完成 "+i+"%");
Thread.currentThread().yield();
        try {
            Thread.sleep(r.nextInt(100)+1);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    System.out.println(this.taskName+"下载完成");
    }
    
}