Java TimerTask 未取消

发布于 2024-12-21 07:21:23 字数 751 浏览 3 评论 0原文

当我在 run 方法中调用 cancel() 时，我的 CheckStatus (TimerTask) 没有停止。 this.cancel() 也不起作用。我做错了什么？

import java.util.TimerTask;
class CheckStatus extends TimerTask {
   int s = 3;
   public void run() {
      if (s > 0)
      {
         System.out.println("checking status");
         s--;
      }
      else
      {
         System.out.println("cancel");
         cancel();
      }
   }
}

这是我的司机

import java.util.*;
class Game {
   static Timer timer;
   static CheckStatus status;

   public static void main(String[] args) throws InterruptedException {        
      CheckStatus status = new CheckStatus();
      timer = new Timer();
      timer.scheduleAtFixedRate(status, 0, 3000);
   }  
}

原文

My CheckStatus (TimerTask) is not stopping when I call cancel() inside the run method. this.cancel() also does not work. What am I doing wrong?

import java.util.TimerTask;
class CheckStatus extends TimerTask {
   int s = 3;
   public void run() {
      if (s > 0)
      {
         System.out.println("checking status");
         s--;
      }
      else
      {
         System.out.println("cancel");
         cancel();
      }
   }
}

Heres my driver

import java.util.*;
class Game {
   static Timer timer;
   static CheckStatus status;

   public static void main(String[] args) throws InterruptedException {        
      CheckStatus status = new CheckStatus();
      timer = new Timer();
      timer.scheduleAtFixedRate(status, 0, 3000);
   }  
}

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倥絔 2024-12-28 07:21:23

它对我有用 - 完全使用您发布的代码，我看到：

checking status
checking status
checking status
cancel

...没有其他内容，表明 TimerTask 已被取消 - 它永远不会再次执行。

您是否期望 Timer 在没有更多工作要做时自行关闭？它不会自动执行此操作。目前尚不清楚您的更大目标是什么，但避免这种情况的一种选择是让 TimerTask 也取消 Timer - 这会起作用，但就术语而言并不是很好设计上的缺陷，意味着 TimerTask 无法在包含其他任务的计时器内正常运行。

It works for me - using exactly the code you posted, I saw:

checking status
checking status
checking status
cancel

... and nothing else, showing that the TimerTask has been cancelled - it's never executing again.

Were you expecting the Timer itself to shut down when it didn't have any more work to do? It doesn't do that automatically. It's not clear what your bigger goal is, but one option to avoid this is to make the TimerTask also cancel the Timer - that will work, but it's not terribly nice in terms of design, and means that the TimerTask can't run nicely within a timer which contains other tasks.

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