How to call a function automaticlly when exit a java program?

Question

I have a static function to save the high score! I wonder is there a easy way to call this function automaticlly when we exit a program. If in C++, I can put this function in destructor and it works. But in java I dont know how! Any idea to do this? Thank you!

And what is your program? Is it command line? Is it a GUI program? — fge, May 21 '15 at 05:13
@Kon you probably don't want to use a JVM exit hook if you run a GUI; rather, you want to plug into the window close event. — fge, May 21 '15 at 05:14
@fge Mostly yes, but that won't fire if the process is terminate through a kill -9 or taskkill, for example. — Kon, May 21 '15 at 05:14
@fge Ah, wasn't aware. That makes sense actually. But at least this case covers all GUI types as well as console programs. But a Listener would be cleaner. — Kon, May 21 '15 at 05:15

Krzysztof Cichocki · Accepted Answer · 2015-05-21T05:27:28.083

2

For all kind of java applications, you could REGISTER A SHUTDOWN HOOK, like this:

   Runtime.getRuntime().addShutdownHook(new Thread() {
   @Override
   public void run() {
    System.out.println("Your job when app shutdown");
   }
  });

edited May 21 '15 at 05:27

answered May 21 '15 at 05:16

Krzysztof Cichocki

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Thanks, but where I can add that function? – user3819845 May 21 '15 at 05:21
At the beginning of your program. It will register the hook, and it will automatically runs the code when the time comes. – Soley May 21 '15 at 05:25
If it works for You, then vote my post up, and mark as the right answer, so others would find this solution easier. – Krzysztof Cichocki May 21 '15 at 05:34

Soley · Answer 2 · 2015-05-21T05:15:31.433

0

for Swing GUI programs

myform.addWindowListener(new java.awt.event.WindowAdapter() {

            public void windowClosing(java.awt.event.WindowEvent e) {
                    // your exit codes here
                    System.exit(0);
            }
        });

edited May 21 '15 at 05:15

answered May 21 '15 at 05:13

Soley

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That's for swing; for JavaFX it will be different – fge May 21 '15 at 05:14
I am a swing guy :), Thanks for the hint, @fge – Soley May 21 '15 at 05:15

How to call a function automaticlly when exit a java program?

2 Answers2