Java实现监控多个线程状态的简单实例

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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