CountDownLatch

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package moco;import java.util.concurrent.CountDownLatch;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;/** * Created by leo on 16/7/7. */public class CountDownLatchTest {    // 模拟了100米赛跑，10名选手已经准备就绪，只等裁判一声令下。当所有人都到达终点时，比赛结束。    public static void main(String[] args) throws InterruptedException {        // 开始的倒数锁        final CountDownLatch begin = new CountDownLatch(1);        // 结束的倒数锁        final CountDownLatch end = new CountDownLatch(10);        // 十名选手        final ExecutorService exec = Executors.newFixedThreadPool(10);        for (int index = 0; index < 10; index++) {            final int NO = index + 1;            Runnable run = new Runnable() {                public void run() {                    try {                        // 如果当前计数为零，则此方法立即返回。                        // 等待                        begin.await();                        Thread.sleep((long) (Math.random() * 10000));                        System.out.println("No." + NO + " arrived");                    } catch (InterruptedException e) {                    } finally {                        // 每个选手到达终点时，end就减一                        end.countDown();                    }                }            };            exec.submit(run);        }        System.out.println("Game Start");        // begin减一，开始游戏        begin.countDown();        // 等待end变为0，即所有选手到达终点        end.await();        System.out.println("Game Over");        exec.shutdown();    }}
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