// Purpose.  JPasswordField and document model demo

import java.awt.*;           // BorderLayout
import java.awt.event.*;     // WindowAdapter, WindowEvent, ActionListener
import javax.swing.*;        // JPanel, JLabel, JPasswordField, JTextField
import javax.swing.text.*;   // JTextComponent 

public class JPasswordFieldDemo extends JPanel {
   public static void main( String[] args ) {

      JFrame frame = new JFrame( "JPasswordField demo" );
      frame.addWindowListener( new WindowAdapter() {
         public void windowClosing( WindowEvent e ) { System.exit( 0 ); } } );

      JLabel prompt = new JLabel( "Enter password:", SwingConstants.CENTER );
      frame.getContentPane().add( prompt, "North" ); 

      JPasswordField password = new JPasswordField( 20 );
      password.setEchoChar( '*' );
      // password.requestFocus();
      frame.getContentPane().add( password, "Center" );

      JTextField repeat = new JTextField( 20 );
      repeat.setDocument( password.getDocument() );
      repeat.requestFocus();
      frame.getContentPane().add( repeat, "South" );

      ActionListener al = new ActionListener() {
         public void actionPerformed( ActionEvent e ) {
            JTextComponent tc = (JTextComponent) e.getSource();
            System.out.println( "password is " + tc.getText() );
            tc.setText( "" );
         }
      };
      password.addActionListener( al );
      repeat.addActionListener( al );

      frame.pack();
      frame.setVisible(true);
   }
}