import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class Main extends JFrame {
public Main() {
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter() {
public void windowOpened(WindowEvent e) {
}
public void windowClosing(WindowEvent e) {
if (JOptionPane.showConfirmDialog(null, "Are you sure ?") == JOptionPane.YES_OPTION) {
setVisible(false);
dispose();
}
}
});
pack();
setVisible(true);
}
public static void main(String args[]) {
new Main();
}
}
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