主方法完成后的Swing计时器持久性 [英] Swing timer persistence after main method finishes

问题描述

我正在尝试创建一个程序来执行一个简单的任务，并在每个 x 秒时产生一个输出。我还希望程序运行直到我决定手动关闭程序。

I am trying to create a program to perform a simple task and produce an output every x seconds. I also want the program to run until I decide to manually close the program.

我一直在尝试使用Swing计时器来实现它，因为我相信这是最好的办法。问题是我不确定一旦主方法执行完毕后如何保持程序运行。例如，我有：

I have been attempting to implement this using a Swing timer, as I believe this is the best way. The problem is I'm not sure how to keep the program going once the main method has finished executing. So for example I have:

 static ActionListener taskPerformer = new ActionListener() {
      public void actionPerformed(ActionEvent evt) {
          try {
            //do stuff
        } catch (Exception e) {
            e.printStackTrace();
        }
          }
  };
public static void main(String[] args) throws Exception{
      Timer timer = new Timer(3000, taskPerformer);
      timer.start();
  }

刚刚立即执行。我可以通过将当前执行线程置于睡眠状态 Thread.currentThread（）。sleep（..）来避免问题，但这感觉就像一个拙劣的工作，并且将会最终持续时间有限。我也可以做（真的），但我相信这是不好的做法。

which just finishes execution immediately. I can dodge the problem by putting the current thread of execution to sleep Thread.currentThread().sleep(..), but this feels like a botch job, and will be ultimately be finite in duration. I can also do while(true), but I believe this is bad practice.

我的问题是如何获得所需的持久性行为，如果有更好的方法比使用Swing计时器。

My question is how to get the desired persistence behavior, and if there is a better way than using Swing timers.

谢谢。

推荐答案

一个Swing计时器只要EDT处于活动状态，它就会保持活着状态，通常这是通过让Swing GUI存在并且可见（这会创建一个非守护程序线程，直到GUI退出）。如果您不需要Swing GUI，则不要使用Swing Timer。也许改为使用java.util.Timer，并且不要退出main方法直到你给出这个词（不过你打算这样做）。

A Swing Timer will stay alive as long as the EDT is alive, usually this is done by having a Swing GUI present and visible (this creates a non-daemon thread that persists until the GUI exits). If you don't need a Swing GUI, then don't use a Swing Timer. Perhaps instead use a java.util.Timer, and don't exit the main method til you give the word (however you plan to do that).

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