Using JTextField and JPasswordField

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

public class TextFieldTest extends JFrame
     {
     private JTextField text1, text2, text3;
     private JPasswordField password;
    
     public TextFieldTest()
         {
         super( "Testing JTextField and JPasswordField" );
        
         Container c = getContentPane();
         c.setLayout( new FlowLayout() );
        
         // construct textfield with default sizing
         text1 = new JTextField( 10 );
         c.add( text1 );
        
         // construct textfield with default text
         text2 = new JTextField( "Enter text here" );
         c.add( text2 );
        
         // construct textfield with default text and
         // 20 visible elements and no event handler
         text3 = new JTextField( "Uneditable text field", 20 );
         text3.setEditable( false );
         c.add( text3 );
        
         // construct textfield with default text
         password = new JPasswordField( "Hidden text" );
         c.add( password );
        
         TextFieldHandler handler = new TextFieldHandler();
         text1.addActionListener( handler );
         text2.addActionListener( handler );
         text3.addActionListener( handler );
         password.addActionListener( handler );
        
         setSize( 325, 100 );
         show();
     }
    
     public static void main( String args[] )
         {
         TextFieldTest app = new TextFieldTest();
        
         app.addWindowListener( new WindowAdapter()
             {
             public void windowClosing( WindowEvent e )
                 {
                 System.exit( 0 );
             }
         } );
     }
    
     private class TextFieldHandler implements ActionListener
         {
         public void actionPerformed( ActionEvent e )
             {
             String s = "";
            
             if ( e.getSource() == text1 )
             s = "text1: " + e.getActionCommand();
             else if ( e.getSource() == text2 )
             s = "text2: " + e.getActionCommand();
             else if ( e.getSource() == text3 )
             s = "text3: " + e.getActionCommand();
             else if ( e.getSource() == password )
                 {
                 JPasswordField pwd = (JPasswordField) e.getSource();
                 s = "password: " + new String( pwd.getPassword() );
             }
            
             JOptionPane.showMessageDialog( null, s );
         }
     }
}