java – How to make a decision structure to close a window?

Question:

In the code below, I want that when choosing sim the window will close and when choosing não the window will remain open.

private void formWindowClosing(java.awt.event.WindowEvent evt) {                                   
    // TODO add your handling code here:

    int Confirm = JOptionPane.showConfirmDialog(null,"Encerrar?","sim ou nao", JOptionPane.YES_NO_OPTION);
    if (Confirm == JOptionPane.YES_OPTION) {
        JOptionPane.showMessageDialog(null, "");
        System.exit(0);
    } else if (Confirm == JOptionPane.NO_OPTION){
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

    }
}

It doesn't give any error, the problem is that when choosing sim the window closes. So far correct, but when choosing não it closes in the same way.

Answer:

You have to use YES_NO_OPTION, try the code snippet below, which I got from an old project of mine. Any questions, just return. Hug

frame.addWindowListener(new WindowAdapter() {
        @Override
        public void windowClosing(java.awt.event.WindowEvent windowEvent) {
            if (JOptionPane.showConfirmDialog(frame, 
                "Titulo", "Tem certeza ?", 
                JOptionPane.YES_NO_OPTION,
                JOptionPane.QUESTION_MESSAGE) == JOptionPane.YES_OPTION){
                System.exit(0);
            }
        }
    });