import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CloseOrNot extends JFrame {

JTextField field1;
JPanel panel;

 public CloseOrNot() {
  super( "CloseOrNot Frame" );
  setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
  panel = new JPanel();
  field1 = new JTextField( 10 );
  panel.add( new JLabel("type yes to close the Frame "));
  panel.add( field1 );
  getContentPane().add( "Center", panel );
  addWindowListener( new WindowAdapter() {
   public void windowOpened( WindowEvent e ){
        field1.requestFocus();
     }
   public void windowClosing( WindowEvent e ){
     if (field1.getText().equals("yes")) {
        if (JOptionPane.showConfirmDialog
             (null,"Are you sure ?")==JOptionPane.YES_OPTION) {
           setVisible(false);
           dispose();
           }
        }
     }
   } ); 
  pack();
  setVisible( true );
  }

 public static void main(String args[]) {
  new CloseOrNot();
  }
}