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To trigger events when a JFrame is closed, you can either register a WindowListener or add a WindowAdapter to your JFrame.

Using WindowListener:

frame.addWindowListener(new WindowAdapter() {
    @Override
    public void windowClosing(WindowEvent e) {
        // Add your code here
    }
});

Using WindowAdapter:

frame.addWindowListener(new WindowAdapter() {
    @Override
    public void windowClosing(WindowEvent e) {
        // Add your code here
    }
});

Both of these methods will give you the ability to handle events when the user closes the JFrame by clicking on the close button.