加入线程

其他线程要等待这个调用join（）方法的线程死亡即终止，才可抢占cpu。

场景：模拟下载电影

package com.commons.commons.testthread;

/**
 * @Author zhaomengxia
 * @create 2019/10/15 9:57
 */
public class ThreadDemo extends Thread{


    private String name;

    public ThreadDemo(String name) {
        super(name);
        this.name = name;
    }

    @Override
    public void run() {
        for (int i = 1; i <=100 ; i++) {
            System.out.println(this.name+"下载了："+i+"%");
        }
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }
}

调用join()。如下图 。其他线程要等待这个调用join（）方法的线程死亡即终止，才可抢占cpu。

package com.commons.commons.testthread;

/**
 * @Author zhaomengxia
 * @create 2019/10/15 9:59
 */
public class ThreadDemoTest {


    public static void main(String[] args) {

        ThreadDemo threadDemo=new ThreadDemo("电影1");

        ThreadDemo threadDemo1=new ThreadDemo("电影2");

        ThreadDemo threadDemo2=new ThreadDemo("电影3");

        threadDemo.start();
        //这个的位置，必须放在所要加入的线程启动之后和下一个线程启动之前
        try {
            threadDemo.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        threadDemo1.start();
        threadDemo2.start();

    }
}

结果