Confirm Exit Dialogue Problem... Help!

Question

Hey,
I am using this piece of code so that when i press the [X] button in the top right hand of my GUI, just before the app exits, it asks the user if they wish to exit.
But it does not quite work. If i click "yes" the app exits, and it does the same when i press "no"! :s
"ImageCreator" in the below code is the name of my application class.
I have tried replacing "ImageCreator" with "this" in the code below but i just get errors when i compile it.
Could someone please help me and show me how to get around this problem.
Thank you for your help! :)
Claire
x
    class WindowEventHandler extends WindowAdapter
        public void windowClosing(WindowEvent e)
            int exitQ = JOptionPane.YES_OPTION;
               exitQ = JOptionPane.showConfirmDialog(ImageCreator,
                                                 "Do you wish to exit?",
                                                 "Exit J.P.E.G.Suite?", JOptionPane.YES_NO_OPTION);
               if(exitQ == JOptionPane.YES_OPTION)
                       System.exit(0);
               else
    }

Answer 1

I would assume you used setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) because I have had this problem before. The thing is, this exits the application no matter what because you tell the app to exit after the window is closed. The trick is to use JFrame.DO_NOTHING_ON_CLOSE and exit the app in the window listener.
Note: <filename> means the currently open file
<application name> means the application name
public class SomeApplication extends JFrame
    public SomeApplication()
         //absolutely essential - we can implement the closure in our window listener
        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
//insert GUI code here
        addWindowListener(new WindowAdapter()
            public void windowClosing(WindowEvent evt)
                 int result = JOptionPane.showConfirmDialog(this, "Do you want to save changes to <filename>?",
"<application name>", JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_CANCEL_OPTION);
                 switch(result)
                     case JOptionPane.YES_OPTION:
                         save(); //your save method  which saves the document
                         System.exit(0);
                     case JOptionPane.NO_OPTION:
                         System.exit(0);
//insert GUI code here...
}Stephen