正月十五吃汤圆CountDownLatch

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

/**
 * @author ：jiaolian
 * @date ：Created in 2021-02-26 14:49
 * @description：CountDownLatch模拟统计吃汤圆花费时间
 * @modified By：
 * 公众号:叫练
 */
public class CountDownLatchSpeedTimeTest {

    public static void main(String[] args) throws InterruptedException {
        //定义一个CountDownLatch计数器
        CountDownLatch countDownLatch = new CountDownLatch(1);
        long start = System.currentTimeMillis();
        //创建一个“叫练”线程吃汤圆
        new Thread(()->{
            int time = (int)(Math.random()*10) + 1;
            //模拟统计吃汤圆花费
            try {
                TimeUnit.SECONDS.sleep(time);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName()+"吃完汤圆");
            //计数器递减
            countDownLatch.countDown();
        },"叫练线程").start();
        //主线程阻塞等待"叫练线程"执行完毕
        countDownLatch.await();
        System.out.println("主线程：吃汤圆共花费"+(System.currentTimeMillis()-start)+"毫秒");
    }
}