多线程之CountDownLatch

最新推荐文章于 2025-07-02 14:41:32 发布

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#多线程 #thread #Java

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本文通过一个具体的 Java 多线程示例介绍了 CountDownLatch 类的基本用法。示例中使用 CountDownLatch 控制两个线程的执行顺序，展示了如何利用 CountDownLatch 的 await 和 countDown 方法来同步线程。

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package projects.debug.learn;

import java.util.concurrent.CountDownLatch;

public class CountDownLatchTest
{
	public void CountDownLatchExa() throws InterruptedException
	{
		final CountDownLatch countDownBegin = new CountDownLatch(1);
		final CountDownLatch countDownEnd = new CountDownLatch(2);
		Thread threadA = new Thread()
		{
			@Override
			public void run()
			{
				try
				{
					countDownBegin.await();
					System.out.println("threadA");
				}
				catch (InterruptedException e)
				{
					e.printStackTrace();
				}
				finally
				{
					countDownEnd.countDown();
				}
			}
		};
		Thread threadB = new Thread()
		{
			@Override
			public void run()
			{
				try
				{
					countDownBegin.await();
					System.out.println("threadB");
				}
				catch (InterruptedException e)
				{
					e.printStackTrace();
				}
				finally
				{
					countDownEnd.countDown();
				}

			}
		};
		System.out.println("CountDownLatchExa-X");
		threadA.start();
		threadB.start();
		countDownBegin.countDown();
		countDownEnd.await();
		System.out.println("CountDownLatchExa-Y");
	}

	public static void main(String[] args) throws InterruptedException
	{
		CountDownLatchTest test = new CountDownLatchTest();
		test.CountDownLatchExa();
	}
}