Close a JFrame under condition

    
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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Close a JFrame under condition : Frame « Swing JFC « Java

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