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Код: Выделить всё

this.addWindowListener(new WindowDestroyer(this));

Код: Выделить всё

public class WindowDestroyer extends WindowAdapter implements ActionListener
{
	private ActionListener c;
	private MessageBox msg; //my class
	public WindowDestroyer(ActionListener c)
	{
		this.c=c;
	}
	
    public void windowClosing(WindowEvent e) 
    {
    	msg = new MessageBox(c);
        msg.askOKCancel("Are you shure you want to exit?");
    }

	public void actionPerformed(ActionEvent e) {
		if (e.getActionCommand().equals("Cancel"))
			msg.closeMessageBox();
		
	}
}

Код: Выделить всё

JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

//....
if (e.getActionCommand().equals("Cancel"))
         msg.closeMessageBox();
else if (e.getActionCommand().equals("Ok"))
         frame.dispose();