48 // modeling the featured frame of the GUI
 49     private class KFrame extends JFrame implements ActionListener {
 50 
 51         private JButton blueButton;
 52         private JButton redButton;
 53         private JButton greenButton;
 54         private JButton yellowButton;
 55         private JPanel reflector;
 56 
 57         public KFrame(String title) {
 58             super(title);
 59             setSize(500, 300);
 60             setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 61             addComponents(getContentPane());
 62             addListeners();
 63             setVisible(true);
 64         }
 65 
 66         private void addComponents(Container contentPane) {
 67             blueButton = new JButton("Blue");
 68             redButton = new JButton("Red");
 69             greenButton = new JButton("Green");
 70             yellowButton = new JButton("Yellow");
 71             reflector = new JPanel();
 72             contentPane.setLayout(new BorderLayout());
 73             contentPane.add(blueButton, BorderLayout.NORTH);
 74             contentPane.add(redButton, BorderLayout.SOUTH);
 75             contentPane.add(greenButton, BorderLayout.EAST);
 76             contentPane.add(yellowButton, BorderLayout.WEST);
 77             contentPane.add(reflector, BorderLayout.CENTER);
 78         }
 79 
 80         // Add the listeners to the frame
 81         private void addListeners() {
 82             blueButton.addActionListener(this);
 83             redButton.addActionListener(this);
 84             greenButton.addActionListener(this);
 85             yellowButton.addActionListener(this);
 86         }
 87         
 88         // This method serves to implement the ActionListener interfaces
 89         @Override
 90         public void actionPerformed (ActionEvent event) {
 91             String command = event.getActionCommand();
 92             if ( command.equals("Red") ) {
 93                 reflector.setBackground(Color.RED);
 94             } else if ( command.equals("Yellow") ) {
 95                 reflector.setBackground(Color.YELLOW);
 96             } else if (command.equals("Blue")) {
 97                 reflector.setBackground(Color.BLUE);
 98             } else if ( command.equals("Green") ) {
 99                 reflector.setBackground(Color.GREEN);
100             }
101         }
102 
103     }
104 
105 }