3.1.5 倒计时器：CountDownLatch

package 第三章.倒计时器CountDownLatch;

import java.util.concurrent.CountDownLatch;

/** * Created by zzq on 2018/1/24. */public class CountDoenLatchTest implements Runnable{static CountDownLatch countDownLatch=new CountDownLatch(3);    public void run() {        try {            Thread.sleep(2000);        } catch (InterruptedException e) {            e.printStackTrace();        }        countDownLatch.countDown();    }

public static void main(String[] args) throws InterruptedException {        CountDoenLatchTest countDoenLatchTest=new CountDoenLatchTest();        Thread thread=new Thread(countDoenLatchTest);        Thread thread2=new Thread(countDoenLatchTest);        Thread thread3=new Thread(countDoenLatchTest);        thread.start();//        thread2.start();//        thread3.start();        countDownLatch.await();        System.out.println("主线程执行----------");    }}

原文地址：https://www.cnblogs.com/anxbb/p/8425544.html