CountDownLatch运用

最新推荐文章于 2023-03-20 22:03:27 发布

原创最新推荐文章于 2023-03-20 22:03:27 发布 · 83 阅读

0 ·

CC 4.0 BY-SA版权

本文介绍了一个使用Java并发工具CountDownLatch的实例。通过创建1000个子线程并使用CountDownLatch来同步主线程与子线程的执行，确保所有子线程完成后再继续执行主线程。每个子线程在启动后会等待开始信号，执行完任务后通知CountDownLatch计数减一。

public class CountDownLatchTest
{
public static void main(String[] args)
throws InterruptedException
{
CountDownLatch startSignal = new CountDownLatch(1000);
CountDownLatch doneSignal = new CountDownLatch(0);
for (int i = 1; i <= 1000; ++i)
{
new Thread(new Worker(startSignal, doneSignal)).start();
}

//一直等待直到所有子线程跑完自动释放
startSignal.await();

System.out.println("bb");
}
}

lass Worker implements Runnable
{
private final CountDownLatch startSignal;

private final CountDownLatch doneSignal;

Worker(CountDownLatch startSignal, CountDownLatch doneSignal)
{
this.startSignal = startSignal;
this.doneSignal = doneSignal;
}

public void run()
{
try
{
doWork();
//一直等待
doneSignal.await();

//调用countDown方法判断子线程是否跑完
startSignal.countDown();
}
catch (InterruptedException ex)
{
}
}

/**
* 子线程所处理的工作任务
* @see [类、类#方法、类#成员]
*/
void doWork()
{
System.out.println("do .........OK");
}
}