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public static void showMessageDialog(Component parentComponent,
                                     Object message,
                                     String title,
                                     int messageType)
parentComponent - determines the Frame in which the dialog is displayed; if 
null, or if the parentComponent has no Frame, a default Frame is used
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ButtonTest.class
ButtonTest$ButtonHandler.class
ButtonTest$1.class
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// Fig. 13.10: ButtonTest.java
// Creating JButtons.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ButtonTest extends JFrame {
   private JButton plainButton, fancyButton;

   // set up GUI
   public ButtonTest()
   {
      super( "Testing Buttons" );

      // get content pane and set its layout
      Container container = getContentPane();
      container.setLayout( new FlowLayout() );

      // create buttons
      plainButton = new JButton( "Plain Button" );
      container.add( plainButton );

      Icon bug1 = new ImageIcon( "bug1.gif" );
      Icon bug2 = new ImageIcon( "bug2.gif" );
      fancyButton = new JButton( "Fancy Button", bug1 );
      fancyButton.setRolloverIcon( bug2 );
      container.add( fancyButton );

      // create an instance of inner class ButtonHandler
      // to use for button event handling 
      ButtonHandler handler = new ButtonHandler();
      fancyButton.addActionListener( handler );
      plainButton.addActionListener( handler );

      setSize( 275, 100 );
      setVisible( true );

   } // end ButtonTest constructor

   public static void main( String args[] )
   { 
      ButtonTest application = new ButtonTest();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }

   // inner class for button event handling
   private class ButtonHandler implements ActionListener {

      // handle button event
      public void actionPerformed( ActionEvent event )
      {
         JOptionPane.showMessageDialog( ButtonTest.this,
                                    //???????????????????
            "You pressed: " + event.getActionCommand() );
      }

   } // end private inner class ButtonHandler

} // end class ButtonTest 
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