Java 示例 - 检查活动线程

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  问题描述

  如何检查线程是否存在？
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  解决方案

  以下示例演示了如何通过扩展 Threda 类并使用 currentThread() 方法来检查线程是否处于活动状态。

  
  public class TwoThreadMoove extends Thread {
     public void run() {
        for (int i = 0; i < 10; i++) {
           printMsg();
        }
     }
     public void printMsg() {
        Thread t = Thread.currentThread();
        String name = t.getName();
        System.out.println("name = " + name);
     }
     public static void main(String[] args) {
        TwoThreadMoove tt = new TwoThreadMoove();
        tt.setName("Thread");
        System.out.println("before start(), tt.isMoove() = " + tt.isMoove());
        tt.start();
        System.out.println("just after start(), tt.isMoove() = " + tt.isMoove());
        
        for (int i = 0; i < 10; i++) {
           tt.printMsg();
        }
        System.out.println("The end of main(), tt.isMoove()=" + tt.isMoove());
     }
  }
  

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  结果

  上面的代码示例将产生以下结果。

  
  before start(), tt.isMoove() = false
  just after start(), tt.isMoove() = true
  name = main
  name = main
  name = main
  name = main
  name = main
  name = main
  name = main
  name = main
  name = main
  name = Thread
  name = main
  name = Thread
  The end of main(), tt.isMoove() = true
  name = Thread
  name = Thread
  name = Thread
  name = Thread
  name = Thread
  name = Thread
  name = Thread
  name = Thread