Java实现监控多个线程状态的简单实例
投稿:jingxian
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实例如下:
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(); //这句代码 建议放在 finally里执行 System.out.println(Thread.currentThread().getName() + "结束. 还有" + threadsSignal.getCount() + " 个线程"); } } }
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