java多线程之CountdownLatch简单应用

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public class CountdownLatchTest {public static void main(String[] args) {ExecutorService service = Executors.newCachedThreadPool();final CountDownLatch cdOrder = new CountDownLatch(1);final CountDownLatch cdAnswer = new CountDownLatch(3);for(int i=0;i<3;i++){Runnable runnable = new Runnable(){public void run(){try {System.out.println("线程" + Thread.currentThread().getName() + "正准备接受命令");cdOrder.await();System.out.println("线程" + Thread.currentThread().getName() + "已接受命令");Thread.sleep((long)(Math.random()*10000));System.out.println("线程" + Thread.currentThread().getName() + "回应命令处理结果");cdAnswer.countDown();} catch (Exception e) {e.printStackTrace();}}};service.execute(runnable);}try {Thread.sleep((long)(Math.random()*10000));System.out.println("线程" + Thread.currentThread().getName() + "即将发布命令");cdOrder.countDown();System.out.println("线程" + Thread.currentThread().getName() + "已发送命令，正在等待结果");cdAnswer.await();System.out.println("线程" + Thread.currentThread().getName() + "已收到所有响应结果");} catch (Exception e) {e.printStackTrace();}service.shutdown();}}

运行结果如下

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线程pool-1-thread-1正准备接受命令
线程pool-1-thread-3正准备接受命令
线程pool-1-thread-2正准备接受命令
线程main即将发布命令
线程main已发送命令，正在等待结果
线程pool-1-thread-1已接受命令
线程pool-1-thread-3已接受命令
线程pool-1-thread-2已接受命令
线程pool-1-thread-3回应命令处理结果
线程pool-1-thread-1回应命令处理结果
线程pool-1-thread-2回应命令处理结果
线程main已收到所有响应结果

整理自教程

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