Why Frme windowClosing with ConfirmDialog closes with both cases(OK & Cancel)?

Question

here is my code :

            addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosing(WindowEvent e) {
               int a = JOptionPane.showConfirmDialog(null, 
                            "Are you sure you want to exit the program?", "Exit Program ",
                            JOptionPane.YES_NO_OPTION);
               System.out.println(a);
               if(a==JOptionPane.OK_OPTION){
                   dispose();
               }
           }});

The problem is either a==OK_OPTION or a==CANCEL_OPTION the frame will close.

Why?

Answer 1

You might have set the default close operation of JFrame as EXIT_ON_CLOSE. So this exits the JFrame no matter if you press OK or CANCEL. You should instead set the default close operation as DO_NOTHING_ON_CLOSE if you want to manually handle the close operation of your JFrame.

setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
               int a = JOptionPane.showConfirmDialog(null, 
                            "Are you sure you want to exit the program?", "Exit Program ",
                            JOptionPane.YES_NO_OPTION);
               System.out.println(a);
               if(a==JOptionPane.OK_OPTION){
                   dispose();//You can use System.exit(0) if you want to exit the JVM
               }
           }});