JFrame On Close Operation

Question

I was wondering if there is a way, by clicking on the "X", to let the program perform some code before closing the JFrame. The setDefaultCloseOperation() method takes only an integer.

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

score 23 · Answer 1 · answered Nov 02 '13 at 06:25

this.addWindowListener(new WindowAdapter(){
                public void windowClosing(WindowEvent e){
                    int i=JOptionPane.showConfirmDialog(null, "Seguro que quiere salir?");
                    if(i==0)
                        System.exit(0);//cierra aplicacion
                }
            });

score 16 · Answer 2 · edited May 06 '12 at 04:58

16

@Jeffrey has a good answer, but you should consider what you're trying to do. If you really want to do something upon the closing of a frame, then a WindowListener is the way to go. However, if you're looking for a place to do some cleanup and graceful shutdown stuff, then you probably want a shutdown hook instead. Using a WindowListener, the code will only be triggered, as you said, by the user "clicking on the X". But what if the user starts the app in the foreground of a terminal and kills it with Ctrl+C? What if the user kills the process from the command line or from a task manager?

edited May 06 '12 at 04:58

COD3BOY

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answered May 06 '12 at 04:48

Ryan Stewart

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Wow, thank you for you reply. Im using this to save some data upon closing the frame. – The JAVA Noob May 06 '12 at 05:01
@Sanjay: I chose to link jdk6 because 1) in my experience, more people are still using 6 than 7, and 2) Runtime.addShutdownHook() didn't change a lick between 6 and 7. – Ryan Stewart May 06 '12 at 06:11
2

okay,point taken :) but I usually prefer to link to the latest docs whatsoever ! – COD3BOY May 06 '12 at 06:20

score 13 · Accepted Answer · answered May 06 '12 at 04:40

13

You might be interested in using a WindowListener. The WindowListener tutorial.

answered May 06 '12 at 04:40

Jeffrey

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Thank you, very much. Thats just what im after. – The JAVA Noob May 06 '12 at 04:44
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Or you can use [WindowAdapter](http://docs.oracle.com/javase/1.4.2/docs/api/java/awt/event/WindowAdapter.html) as convenience for creating listener objects. – Pau Kiat Wee May 06 '12 at 04:48

JFrame On Close Operation

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