JFrame catch dispose event

Question

I have a Java project.
I have a JFrame with a handler attached to it like so

frame.addWindowListener(new WindowAdapter() {

            public void windowClosing(WindowEvent evt) {
                this.setEnabled(true);

            }
        });

But, on that frame I also have a close button (to make it more user friendly) and that "close" button calls the frame dispose method. Now, when I close the frame by clicking the little x button on the top right corner, the WindowListener is called. But the event doesn't fire when I invoke the dispose method.
should I Invoke some other method to close, so the WindowListener fires, or maybe implement another listener?

cbaldan cbaldan · Accepted Answer · 2018-01-04T21:36:05

You should take a look at the WindowListener interface.

windowClosing(): Invoked when the user attempts to close the window from the window's system menu. (window X button)

windowClosed(): Invoked when a window has been closed as the result of calling dispose on the window.

So, windowClosing() is called only when the user clicks the X button of the window; windowClosed() is called when the dispose() event is invoked, so it is always invoked:

if the user closes the frame using the windows X button
if the frame is programatically closed by code

    JFrame myFrame = new JFrame();
    myFrame.addWindowListener(new java.awt.event.WindowAdapter() {
        @Override
        public void windowClosed(java.awt.event.WindowEvent windowEvent) {
            // your code
        }
    });

Source: https://alvinalexander.com/blog/post/jfc-swing/closing-your-java-swing-application-when-user-presses-close-but

JFrame catch dispose event

2 Answers