Java Swing adding Action Listener for EXIT_ON_CLOSE

Question

I have a simple GUI:

    public class MyGUI extends JFrame{

        public MyGUI(){
           run();
        }

        void run(){
           setSize(100,         


        

Answer 1

Window Events: There is the complete program, hope it will help you. public class FirstGUIApplication {

public static void main(String[] args) {
    //Frame
    JFrame window = new JFrame();
    //Title:setTitle()
    window.setTitle("First GUI App");
    //Size: setSize(width, height)
    window.setSize(600, 300);
    //Show: setVisible()
    window.setVisible(true);
    //Close
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.addWindowListener(new WindowAdapter() {


        @Override
        public void windowClosing(WindowEvent e) {
            super.windowClosing(e); 
            JOptionPane.showConfirmDialog(null,"Are sure to close!");
        }

        @Override
        public void windowOpened(WindowEvent e) {
            super.windowOpened(e); 
            JOptionPane.showMessageDialog(null, "Welcome to the System");
        }

    });

}

}