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?

Solution 1

You need this:

yourFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

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

Solution 2

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();

Solution 3

How about invoking dispose() method?

Solution 4

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);
    }
}

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Comments

[WhiteFang34]

Just tried, dispose() doesn't trigger a window closing event. It does close the window though.

[Lukasz]

Well, I think the OP wants to close it programmatically.

[javing]

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.

[trashgod]

See also this related Q&A regarding JDialog.

[trashgod]

Excellent sscce, but it won't trigger the questioner's WindowListener; I'm guessing that was was the goal, based on the accepted answer.

[Andrew Thompson]

Just to go off-topic, thanks for adding the Mac. screen shot to the Nested Layout Example. :)