Color Cycle

Exer.2 Color Cycle
/*
Programmer: Albert Ampo
Date Started: March 17,2009
Date Ended: March 18, 2009

*/

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class ButtonDemo extends JPanel implements ActionListener {

 private static boolean USE_CROSS_PLATFORM_UI = false;
 
 int buttonLabelIndex = 0;
 String buttonLabels[] = { "Green", "blue", "Gray", "Red" };
 Color buttonColors[] = { Color.GREEN, Color.BLUE, Color.GRAY, Color.RED,};
 
 JButton button;
 
 public ButtonDemo() {
  super(new BorderLayout());
  
  button = new JButton(buttonLabels[buttonLabelIndex]);
  // In the default UI look and feel you cannot easily alter the background color
  // for buttons since it is designed to match the OS X UI.
  if(USE_CROSS_PLATFORM_UI) {
  button.setBackground(buttonColors[buttonLabelIndex]);
  } else {
  button.setForeground(buttonColors[buttonLabelIndex]);
  }
  
  button.addActionListener(this);
 
  
  this.add(button, BorderLayout.CENTER);
  
  this.setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
 }
 
 public void actionPerformed(ActionEvent e) {
  buttonLabelIndex = ++buttonLabelIndex < buttonLabels.length?buttonLabelIndex:0;

  button.setText(buttonLabels[buttonLabelIndex]);
  this.setBackground(buttonColors[buttonLabelIndex]);
  button.setBackground(buttonColors[buttonLabelIndex]);
 
 }

 
 private static void run() {
  if(USE_CROSS_PLATFORM_UI) {
  try {
  UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
  } catch (Exception e) {
  e.printStackTrace();
  }
  }
  
  JFrame frame = new JFrame("Button Demo");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
  JComponent contentPane = new ButtonDemo();
  contentPane.setOpaque(true);
  
  frame.setContentPane(contentPane);
  frame.pack();
  
  frame.setVisible(true);
 }
 
 public static void main(String[] args) {
  run();
 }

}