How to capture a JFrame's close button click event?

JavaSwingJframeWindowlistener

Java Problem Overview


I want to call a method confirmExit() when the red close button of the title bar of a JFrame is clicked.

How can I capture that event?

I'd also like to prevent the window from closing if the user chooses not to proceed.

Java Solutions


Solution 1 - Java

import javax.swing.JOptionPane;
import javax.swing.JFrame;

/*Some piece of code*/
frame.addWindowListener(new java.awt.event.WindowAdapter() {
	@Override
    public void windowClosing(java.awt.event.WindowEvent windowEvent) {
        if (JOptionPane.showConfirmDialog(frame, 
            "Are you sure you want to close this window?", "Close Window?", 
            JOptionPane.YES_NO_OPTION,
            JOptionPane.QUESTION_MESSAGE) == JOptionPane.YES_OPTION){
            System.exit(0);
        }
   	}
});

If you also want to prevent the window from closing unless the user chooses 'Yes', you can add:

frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

Solution 2 - Java

Override windowClosing Method.

public void windowClosing(WindowEvent e)

It is invoked when a window is in the process of being closed. The close operation can be overridden at this point.

Solution 3 - Java

This may work:

jdialog.addWindowListener(new WindowAdapter() {
	public void windowClosed(WindowEvent e) {
		System.out.println("jdialog window closed event received");
	}

	public void windowClosing(WindowEvent e) {
		System.out.println("jdialog window closing event received");
	}
});

Source: https://alvinalexander.com/java/jdialog-close-closing-event

Solution 4 - Java

	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

also works. First create a JFrame called frame, then add this code underneath.

Solution 5 - Java

This is what I put as a menu option where I made a button on a JFrame to display another JFrame. I wanted only the new frame to be visible, and not to destroy the one behind it. I initially hid the first JFrame, while the new one became visible. Upon closing of the new JFrame, I disposed of it followed by an action of making the old one visible again.

Note: The following code expands off of Ravinda's answer and ng is a JButton:

ng.addActionListener((ActionEvent e) -> {
    setVisible(false);
    JFrame j = new JFrame("NAME");
    j.setVisible(true);
    j.addWindowListener(new java.awt.event.WindowAdapter() {
        @Override
        public void windowClosing(java.awt.event.WindowEvent windowEvent) {
            setVisible(true);
        }
    });
});

Solution 6 - Java

Try this:

setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);

It will work.

Attributions

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionalxcylView Question on Stackoverflow
Solution 1 - JavaRavindra GullapalliView Answer on Stackoverflow
Solution 2 - JavaShashank KadneView Answer on Stackoverflow
Solution 3 - JavaPhidippusView Answer on Stackoverflow
Solution 4 - JavaRussellView Answer on Stackoverflow
Solution 5 - JavaCodyView Answer on Stackoverflow
Solution 6 - Javavikas bodadeView Answer on Stackoverflow