Java 示例 - 挂起线程

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  问题描述

  如何暂停线程一段时间？
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  解决方案

  以下示例显示了如何通过创建 sleepThread() 方法暂停线程一段时间。

  
  public class SleepingThread extends Thread {
     private int countDown = 5;
     private static int threadCount = 0;
     
     public SleepingThread() {
        super("" + ++threadCount);
        start();
     }
     public String toString() { 
        return "#" + getName() + ": " + countDown;
     }
     public void run() {
        while (true) {
           System.out.println(this);
           if (--countDown == 0) return;
           try {
              sleep(100);
           } catch (InterruptedException e) {
              throw new RuntimeException(e);
           }
        }
     }
     public static void main(String[] args) throws InterruptedException {
        for (int i = 0; i < 5; i++) new SleepingThread().join();
        System.out.println("The thread has been suspened.");
     }
  }
  

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  结果

  上面的代码示例将产生以下结果。

  
  #1: 5
  #1: 4
  #1: 3
  #1: 2
  #1: 1
  #2: 5
  #2: 4
  #2: 3
  #2: 2
  #2: 1
  #3: 5
  #3: 4
  #3: 3
  #3: 2
  #3: 1
  #4: 5
  #4: 4
  #4: 3
  #4: 2
  #4: 1
  #5: 5
  #5: 4
  #5: 3
  #5: 2
  #5: 1
  The thread has been suspened.