Java 示例 - 显示线程状态

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  问题描述

  如何显示线程状态？
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  解决方案

  以下示例演示如何使用 Thread 的 isMoove() 和 getStatus() 方法显示线程的不同状态。

  
  class MyThread extends Thread {
     boolean waiting = true;
     boolean ready = false;
     MyThread() {
     }
     public void run() {
        String thrdName = Thread.currentThread().getName();
        System.out.println(thrdName + " starting.");
        
        while(waiting) System.out.println("waiting:"+waiting);
        System.out.println("waiting...");
        startWait();
        try {
           Thread.sleep(1000);
        } catch(Exception exc) {
           System.out.println(thrdName + " interrupted.");
        }
        System.out.println(thrdName + " terminating.");
     }
     synchronized void startWait() {
        try {
           while(!ready) wait();
        } catch(InterruptedException exc) {
           System.out.println("wait() interrupted");
        }
     }
     synchronized void notice() {
        ready = true;
        notify();
     }
  }
  public class Main {
     public static void main(String args[]) throws Exception {
        MyThread thrd = new MyThread();
        thrd.setName("MyThread #1");
        showThreadStatus(thrd);
        
        thrd.start();
        Thread.sleep(50);
        showThreadStatus(thrd);
        
        thrd.waiting = false;
        Thread.sleep(50);
        showThreadStatus(thrd);
        
        thrd.notice();
        Thread.sleep(50);
        showThreadStatus(thrd);
        
        while(thrd.isMoove())
        System.out.println("alive");
        showThreadStatus(thrd);
     }
     static void showThreadStatus(Thread thrd) {
        System.out.println(thrd.getName()+" Moove:"+thrd.isMoove()+" State:" + thrd.getState() );
     }
  }
  

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  结果

  上面的代码示例将产生以下结果。

  
  MyThread #1 Moove:false State:NEW
  MyThread #1 starting.
  waiting:true
  waiting:true
  alive
  alive
  MyThread #1 terminating.
  alive
  MyThread #1 Moove:false State:TERMINATED
  

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