Java线程池ExecutorService和CountDownLatch的小例子

r囧r小猫 2022-04-13 07:20 162阅读 0赞

import java.util.concurrent.CountDownLatch;
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    
    /**
     * 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。
     * @author liuchao
     *
     */
    public class Actor {
    
        public static void main(String[] args) throws InterruptedException {
            //10名运动员
            final CountDownLatch count = new CountDownLatch(10);
            
            //java的线程池
            final ExecutorService executorService = Executors.newFixedThreadPool(5);
            
            for(int index=1;index<=10;index++){
                final int number = index;
                executorService.submit(new Runnable() {
                    public void run() {
                        try {
    
                            Thread.sleep((long) (Math.random()*10000));
                            System.out.println(number+": arrived");
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        } finally{
                            //运动员到达终点,count数减一
                            count.countDown();
                        }
                    }
                });
            }
            System.out.println("Game Started");
            //等待count数变为0,否则会一直处于等待状态,游戏就没法结束了
            count.await();
            System.out.println("Game Over");
            //关掉线程池
            executorService.shutdown();
        }
    }

运行结果
    
    Game Started
    5: arrived
    1: arrived
    2: arrived
    3: arrived
    8: arrived
    4: arrived
    6: arrived
    9: arrived
    7: arrived
    10: arrived
    Game Over

转载自：[http://www.cnblogs.com/liuchao102/p/4383894.html][http_www.cnblogs.com_liuchao102_p_4383894.html]

[http_www.cnblogs.com_liuchao102_p_4383894.html]: http://www.cnblogs.com/liuchao102/p/4383894.html