ButtonTest.java

package button;

//ButtonTest.java
//Creating JButtons.

//Java core packages
import java.awt.*;
import java.awt.event.*;

//Java extension packages
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);
}

// execute application
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(null,
         "You pressed: " + event.getActionCommand());
   }

}  // end private inner class ButtonHandler

}  // end class ButtonTest