Java并发编程：CountDownLatch应用实例-蒲公英云

Java并发编程：CountDownLatch应用实例

CountDownLatch是Java中一种用于协调多个线程的工具。当一个线程等待其他线程完成某个操作，就可以使用CountDownLatch。

以下是一个简单的CountDownLatch应用实例：

import java.util.concurrent.CountDownLatch;
public class CountDownLatchExample {
    private CountDownLatch signal = new CountDownLatch(1);
    public void workerThread() {
        try {
            // 线程需要等待信号量下降到0
            signal.await();
            // 如果信号量已经降为0，那么线程就可以执行自己的任务了
            System.out.println("Worker thread is running...");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        CountDownLatchExample example = new CountDownLatchExample();
        // 创建两个工作线程
        Thread workerThread1 = new Thread(example::workerThread);
        Thread workerThread2 = new Thread(example::workerThread);
        // 启动工作线程
        workerThread1.start();
        workerThread2.start();
        // 当主线程等待所有工作线程完成任务时，调用countDown方法
        example.signal.countDown();
        System.out.println("Main thread completed the task...");
    }
}