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" );
 
      // get content pane and set its layout
      Container container = getContentPane();
      container.setLayout( new FlowLayout() );
 
      label = new JLabel( "Testing JLabel" );
      label.setToolTipText( "Label with text" );
      container.add( label );
 
      t1 = new JTextField( 10 );
      t2 = new JTextField( "Enter text here" );
// if you add the line t2.setEditable(false) the object t2 will be like a label
      container.add( t1 );
      container.add( t2 );
 
      p1 = new JPasswordField( 10 );
      container.add( p1 );
 
      plainButton = new JButton( "Plain Button" );
      container.add( plainButton );
 
     
// 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 );
 
// This is the same thing with the button
//      plainButton.addActionListener( h2 );
//      ButtonHandler h2 = new ButtonHandler();
 
// An alternative is to create 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 );
   }
 
   // execute application
   public static void main( String args[] )   {
      Test application = new Test();
      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }
 
 
   // 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 );
      }
   }
 
   // inner class for button event handling
   // private class ButtonHandler implements ActionListener {
   //   public void actionPerformed( ActionEvent event ){
   //      JOptionPane.showMessageDialog( null,
   //          "You pressed: " + event.getActionCommand() );
   //   }
   // }  // end private inner class ButtonHandler
 
}  // end class Test