close java frame using code

Question

Possible Duplicate:
How to programmatically close a JFrame

I am developing a java GUI using JFrame. I want to close the GUI frame and dispose it off through code. I have implemented :

topFrame.addWindowListener(new WindowListener()
        {
            public void windowClosing(WindowEvent e)
            {
                emsClient.close();
            }
            public void windowOpened(WindowEvent e) {
            }
            public void windowClosed(WindowEvent e) {
            }
            public void windowIconified(WindowEvent e) {
            }
            public void windowDeiconified(WindowEvent e) {
            }
            public void windowActivated(WindowEvent e) {
            }
            public void windowDeactivated(WindowEvent e) {
            }
        });`

How can I invoke the windowClosing event?? Or is there some other way?

Please look in below thread for the same purpose: http://stackoverflow.com/questions/258099/how-to-close-a-java-swing-application-from-the-code — Phani, Apr 29 '11 at 09:26

score 18 · Answer 1 · answered Apr 29 '11 at 09:27

18

This will programmatically trigger the window closing event:

topFrame.dispatchEvent(new WindowEvent(topFrame, WindowEvent.WINDOW_CLOSING));

If you want to close the frame you need to call:

topFrame.dispose();

answered Apr 29 '11 at 09:27

WhiteFang34

70,765
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See also this related [Q&A](http://stackoverflow.com/questions/5540354) regarding `JDialog`. – trashgod Apr 29 '11 at 20:40

score 3 · Answer 2 · answered Apr 29 '11 at 09:23

3

How about invoking dispose() method?

answered Apr 29 '11 at 09:23

Lukasz

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Just tried, `dispose()` doesn't trigger a window closing event. It does close the window though. – WhiteFang34 Apr 29 '11 at 09:25

score 2 · Accepted Answer · answered Apr 29 '11 at 09:24

2

You need this:

yourFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

You can add that line in the constructor(Dont forget it).

answered Apr 29 '11 at 09:24

javing

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3

Well, I think the OP wants to close it programmatically. – Lukasz Apr 29 '11 at 09:26
If so he just need to catch the event for closing and call dispose(). But i don't understand, why not just adding that method in the constructor. Some IDEs add it even automatically when creating a JFrame. – javing Apr 29 '11 at 09:38

score 2 · Answer 4 · answered Apr 29 '11 at 09:37

import java.awt.event.*;
import javax.swing.*;

class CloseFrame {

    public static void main(String[] args) {

        Runnable r = new Runnable() {

            public void run() {
                JButton close = new JButton("Close me programmatically");
                final JFrame f = new JFrame("Close Me");
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.setContentPane( close );
                close.addActionListener( new ActionListener(){
                    public void actionPerformed(ActionEvent ae) {
                        // make the app. end (programatically)
                        f.dispose();
                    }
                } );
                f.pack();
                f.setLocationByPlatform(true);
                f.setVisible(true);
            }
        };

        SwingUtilities.invokeLater(r);
    }
}

Excellent [sscce](http://sscce.org/), but it won't trigger the questioner's `WindowListener`; I'm guessing that was was the goal, based on the accepted answer. — trashgod, Apr 29 '11 at 20:44
Just to go off-topic, thanks for adding the Mac. screen shot to the Nested Layout Example. :) — Andrew Thompson, Apr 30 '11 at 04:08

close java frame using code

4 Answers4