When a JFrame is Closed

Question

I have a JFrame and I would like to know when the close button is clicked for that JFrame. When the JFrame is closed my whole project does not close so I want to be able to tell when the user closes that one Frame.

I've tried using methods like as !f.isShowing and !m.f.isActive() but when I close the Frame, what I want to happen doesn't.

Read this: http://stackoverflow.com/questions/1234912/how-to-programmatically-close-a-jframe?rq=1 — user123454321, Feb 22 '14 at 19:19
I don't want to close it, I want to know when the user closes it. — user3341532, Feb 22 '14 at 19:19
Just to be clear, do you simply have a problem with the run not ending when the frame closes, or do you want to do something when the frame closes? Because both are mentioned in your question. — BitNinja, Feb 22 '14 at 19:27
I have to wonder if this isn't really an [XY Problem](http://meta.stackexchange.com/questions/66377/what-is-the-xy-problem) in disguise and if what you really want is to use a modal JDialog. If you tell us more of the background story, we may be able to give you a much better answer. — Hovercraft Full Of Eels, Feb 22 '14 at 19:35

score 4 · Answer 1 · answered Feb 22 '14 at 19:46

4

If you don't want to do anything special when the frame closes, you can use setDefaultCloseOperation to change the way a JFrame

EXIT_ON_CLOSE

The exit application default window close operation. If a window has this set as the close operation and is closed in an applet, a SecurityException may be thrown. It is recommended you only use this in an application.

HIDE_ON_CLOSE

The hide-window default window close operation

DISPOSE_ON_CLOSE

The dispose-window default window close operation. Note: When the last displayable window within the Java virtual machine (VM) is disposed of, the VM may terminate. See AWT Threading Issues for more information.

answered Feb 22 '14 at 19:46

MadProgrammer

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1+, but I'm guessing that he really wants a modal JDialog, since he wants to know when the window is closed and does not want the app to close. But til he tells more, who knows? – Hovercraft Full Of Eels Feb 22 '14 at 19:48
@HovercraftFullOfEels That's kinda of what I thought, hence the reason for the opening statement – MadProgrammer Feb 22 '14 at 19:50

score 1 · Answer 2 · edited Feb 22 '14 at 19:54

1

import javax.swing.JOptionPane;
frame.addWindowListener(new java.awt.event.WindowAdapter() {
    @Override
    public void windowClosing(java.awt.event.WindowEvent windowEvent) {
        if (JOptionPane.showConfirmDialog(frame,...) ...) {
            // ...
            System.exit(0);
        }
    }
});

edited Feb 22 '14 at 19:54

dic19

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answered Feb 22 '14 at 19:22

user123454321

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@dic19 Rubbish, System.exit instructs the JVM to terminate in controlled and known manner and won't be terminated until all non-daemon threads are also terminated. – MadProgrammer Feb 22 '14 at 19:44
@MadProgrammer I was wrong my entirely java life I guess :P – dic19 Feb 22 '14 at 19:51
@dic19 I know the feeling ;) – MadProgrammer Feb 22 '14 at 19:53
Sorry @pospeq I've revoked my unnecessary/incorrect downvote. – dic19 Feb 22 '14 at 20:07

BitNinja · Answer 3 · 2014-04-28T20:28:40.833

0

when the JFrame is closed my whole project does not close...

A common cause of this is that when you declare a JFrame you should call this method of JFrame to make it close when you press the 'x' button:

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

edited Apr 28 '14 at 20:28

answered Feb 22 '14 at 19:46

BitNinja

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When a JFrame is Closed

3 Answers3