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----------");
    }
}