Java实现监控多个线程状态的实现

来源：互联网发布：win7隐藏网络连接不上编辑：程序博客网时间：2024/06/06 03:56

转载自http://blog.csdn.net/lxw2100/article/details/5944135

场景：需要启动多线程处理事情，而在所有事情做完之后，需要修改系统状态；那么如何判断所有线程（事情）都做完了呢？这就需要判断所有当前运行的线程状态了。

import java.util.concurrent.CountDownLatch;import java.util.concurrent.Executor;import java.util.concurrent.Executors;/** * 测试监控类 * * @author * */public class WatchThread { /**  * 测试函数  *  * @throws InterruptedException  */ public void testThread() throws InterruptedException {  int threadNum = 10;  // 初始化countDown  CountDownLatch threadSignal = new CountDownLatch(threadNum);  // 创建固定长度的线程池  Executor executor = Executors.newFixedThreadPool(threadNum);  for (int i = 0; i < threadNum; i++) { // 开threadNum个线程   Runnable task = new TestThread(threadSignal);   // 执行   executor.execute(task);  }  threadSignal.await(); // 等待所有子线程执行完  // do work  System.out.println(Thread.currentThread().getName() + "+++++++结束."); } /**  * 测试函数  */ public static void main(String[] args) throws InterruptedException {  WatchThread test = new WatchThread();  test.testThread(); } /**  *  * @author jill  *  */ private class TestThread implements Runnable {  private CountDownLatch threadsSignal;  public TestThread(CountDownLatch threadsSignal) {   this.threadsSignal = threadsSignal;  }  public void run() {   System.out.println(Thread.currentThread().getName() + "开始...");   // do shomething   System.out.println("开始了线程：：：：" + threadsSignal.getCount());   // 线程结束时计数器减1   threadsSignal.countDown();   System.out.println(Thread.currentThread().getName() + "结束. 还有"     + threadsSignal.getCount() + " 个线程");  } }}

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