CountDownLatchTest

最新推荐文章于 2023-07-25 17:41:57 发布

jamesge2010

最新推荐文章于 2023-07-25 17:41:57 发布

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分类专栏：多线程

本文链接：https://blog.youkuaiyun.com/jamesge2010/article/details/114607375

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本文通过一个使用CountDownLatch的并发编程案例，展示了如何控制多个线程的启动和同步问题。该示例模拟了8位选手在发令枪响后开始比赛，并在到达终点后通知主线程的情况。案例中使用了Java的CountDownLatch、ThreadPoolExecutor等类。

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import java.util.concurrent.*;

public class CountDownLatchTest {

    public static void main(String[] args) {
        final CountDownLatch order = new CountDownLatch(1);
        final CountDownLatch answer = new CountDownLatch(8);
        ThreadPoolExecutor poolExecutor = new ThreadPoolExecutor(8, 8, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(1024));
//        int length = 8;
        for(int i=0; i<8; i++) {
            final int ii = i;
            Runnable runnable = new Runnable() {
                public void run() {
                    try {
                        Thread.sleep(100);
                        System.out.println("选手" + ii + "准备就绪" + Thread.currentThread().getName());
                        order.await();
                        System.out.println("选手" + ii + "到达终点" + Thread.currentThread().getName());
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    } finally {
                        answer.countDown();
                    }
                }
            };
            poolExecutor.execute(runnable);
        }

        try {
            System.out.println("等待发令枪：" + Thread.currentThread().getName());
            Thread.sleep(2000);
            order.countDown();
            System.out.println("等待所有选手到达终点：" + Thread.currentThread().getName());
            answer.await();
            System.out.println("所有选手已经到达！");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        poolExecutor.shutdown();
    }
}