setDefaultCloseOperation to show a JFrame instead

I am making a word processor application in order to practise Java and I would like it so that when the user attempts to close the appliction, a JFrame will come up asking to save changes.

I was thinking about setDefaultCloseOperation() but I have had little luck so far. I would also like it to appear whent he user clicks the "X" on the top right of the window aswell if possible.

You can set the JFrame DefaultCloseOperation to something like DO_NOTHING, and then, set a WindowsListener to grab the close event and do what you want. I'll post an exemple in a few minutes .

EDIT: Here's the example :

public static void main(String[] args) {
        final JFrame frame = new JFrame("Test Frame");

        frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

        frame.setSize(800, 600);

        frame.addWindowListener(new WindowAdapter() {
            //I skipped unused callbacks for readability

            @Override
            public void windowClosing(WindowEvent e) {
                if(JOptionPane.showConfirmDialog(frame, "Are you sure ?") == JOptionPane.OK_OPTION){
                    frame.setVisible(false);
                    frame.dispose();
                }
            }
        });

        frame.setVisible(true);
    }