Do something before window closes after user presses [x]

Question

I'm building an instant messenger application.I need to add an action event on the default closing button of the Swing JFrame(The little "x").
When the client presses the X button,I need to tell the server that he goes offline and only after that action occures I have to close the window.I can't seem to find how to get an action listener on the default button.

This type of question has only been asked over a hundred times here including: [JFrame On Close Operation](http://stackoverflow.com/questions/10468149/jframe-on-close-operation). Voting to close as a duplicate. — Hovercraft Full Of Eels, Sep 26 '12 at 11:54

score 5 · Answer 1 · answered Sep 26 '12 at 11:49

5

Look into the Runtime.addShutdownHook() method. http://docs.oracle.com/javase/6/docs/api/java/lang/Runtime.html#addShutdownHook%28java.lang.Thread%29

answered Sep 26 '12 at 11:49

Billdr

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score 5 · Accepted Answer · answered Sep 26 '12 at 11:51

5

take a look of this may its helps you. Closing an Application
You can give your own implementation if some one press close button.

frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

frame.addWindowListener( new WindowAdapter()
 {
   public void windowClosing(WindowEvent e)
    {
      // Here you can give your own implementation according to you.
     }
  });

answered Sep 26 '12 at 11:51

Sumit Singh

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I was close.I just wrote new windowAdapter without adding it.Didn't realize.Thanks man! – Adrian Stamin Sep 26 '12 at 13:34

score 4 · Answer 3 · answered Sep 26 '12 at 11:48

4

Simply add a WindowListener to your JFrame and use the event windowClosing

answered Sep 26 '12 at 11:48

Guillaume Polet

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Jon Skeet · Answer 4 · 2012-09-26T11:53:48.040

Sounds like you want to call addWindowListener with a WindowListener which handles windowClosing or windowClosed. You may well want to create a subclass of WindowAdapter so you can just override the method(s) you're interested in.

Don't forget that your communication with the server should be in a different thread - don't block the UI thread with network traffic. However, also bear in mind that if your whole application is closing:

Any connection to the server will close anyway
Any background threads will be terminated

score 3 · Answer 5 · answered Sep 26 '12 at 11:49

JFrame f = new JFrame("Blah");
f.addWindowListener(new WindowAdapter() {
    public void windowClosing(WindowEvent e) {
        //do whatever you want before the window closes.
    }
});
f.setVisible(true);

Don't do f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); because that might interrupt your server communications. Instead, say System.exit(0) manually when you have done your server communications.

Do something before window closes after user presses [x]

5 Answers5