import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class Test extends JFrame {
   private JLabel label;
   private JTextField t1, t2;
   private JPasswordField p1;
   private JButton plainButton;
 
  
   public Test()   {
      super( "Testing GUI Components" );
      Container container = getContentPane();
      container.setLayout( new BorderLayout(5,5) );
      label = new JLabel( "Testing JLabel" );
      label.setToolTipText( "Label with text" );
      container.add( label , BorderLayout.NORTH);
      t1 = new JTextField( 10 );
      t2 = new JTextField( "Enter text here" );
      container.add( t1, BorderLayout.EAST );
      container.add( t2, BorderLayout.WEST );
      p1 = new JPasswordField( 10 );
      container.add( p1, BorderLayout.SOUTH );
      plainButton = new JButton( "Plain Button" );
      container.add( plainButton, BorderLayout.CENTER );  
// Create instances of inner classes for event handling - the event listeners
      TextFieldHandler h1 = new TextFieldHandler ();
// Registers the event listeners with the event sources
      t1.addActionListener( h1 );
      t2.addActionListener( h1 );
      p1.addActionListener( h1 );
// For button use a no-name event listener
     plainButton.addActionListener(
                 new ActionListener () {  // note that the object is of interface type.. no need for another class name
                                  public void actionPerformed( ActionEvent event ){
                                           JOptionPane.showMessageDialog( null,"You pressed: " + event.getActionCommand() );
                                }
                   }
      );
      setSize( 275, 100 );
      setVisible( true );
   }  // end of constructor
 
   // inner class for textfield event handling
   private class TextFieldHandler implements ActionListener {
      public void actionPerformed( ActionEvent event ){
         String s = "";
         if (event.getSource() == t1)
         s = "textfield 1 has: " + event.getActionCommand() ;
         else if (event.getSource() == t2)
         s = "textfield 2 has: " + event.getActionCommand() ;
         else if (event.getSource() == p1)
         s = "password field  has: " + event.getActionCommand() ;
                 JOptionPane.showMessageDialog( null, s );
      }
   }
 
   // execute application
   public static void main( String args[] )   {
      Test application = new Test();
      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//      application.addWindowListener( new WindowAdapter() {
//                 public void windowClosing (WindowEvent e) {
//                     System.exit(0);
//                }
//          }
 
   }
}  // end class Test