使用CountDownLatch实现多线程同时启动

最新推荐文章于 2023-08-09 17:59:27 发布

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最新推荐文章于 2023-08-09 17:59:27 发布

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分类专栏： java开发文章标签： java 多线程 countdownlatch

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本文介绍了一个使用Java的CountDownLatch类实现多线程同步启动的例子。通过CountDownLatch控制多个线程的启动时机，确保所有线程能够同时开始执行指定任务。

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import java.util.concurrent.CountDownLatch;

/**
 * 使用CountDownLatch实现多线程同时启动
 * @author snlai
 */
public class CountDownLatchTest {

    public static void main(String[] args) {
        System.out.println("Use CountDownLatch to start threads simultaneously");
        CountDownLatchTest countDownLatchTest = new CountDownLatchTest();
        CountDownLatch countDownLatch = new CountDownLatch(1);
        int num = 3;
        for (int i = 0; i < num; i++) {
            Thread thread = new Thread(countDownLatchTest.new MyThread(countDownLatch));
            thread.start();
        }
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        countDownLatch.countDown();
    }

    public class MyThread implements Runnable {
        CountDownLatch countDownLatch;

        public MyThread(CountDownLatch countDownLatch) {
            this.countDownLatch = countDownLatch;
        }

        @Override
        public void run() {
            System.out.println(Thread.currentThread().getName() + " start!");
            try {
                countDownLatch.await();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + " start doing something simultaneously!");
        }
    }
}