import javax.swing.*;
import java.awt.*; 
import java.awt.event.*;

public class CardLayoutDemo extends JFrame implements ActionListener
{
    public static final int WIDTH = 300;
    public static final int HEIGHT = 200;

    private CardLayout dealer;
    private JPanel deckPanel;

    public CardLayoutDemo()
    {
        setSize(WIDTH, HEIGHT);
        addWindowListener(new WindowDestroyer());
        setTitle("CardLayout Demonstration");
        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());

        deckPanel = new JPanel();
        dealer = new CardLayout();
        deckPanel.setLayout(dealer);

        JPanel startCardPanel = new JPanel();
        startCardPanel.setLayout(new FlowLayout());
        startCardPanel.setBackground(Color.lightGray);
        JLabel startLabel = new JLabel("Hello");
        startCardPanel.add(startLabel);
        deckPanel.add("start", startCardPanel);

        JPanel greenCardPanel = new JPanel();
        greenCardPanel.setLayout(new FlowLayout());
        greenCardPanel.setBackground(Color.green);
        JLabel goLabel = new JLabel("Go");
        greenCardPanel.add(goLabel);
        deckPanel.add("green", greenCardPanel);

        JPanel redCardPanel = new JPanel();
        redCardPanel.setLayout(new FlowLayout());
        redCardPanel.setBackground(Color.red);
        JLabel stopLabel = new JLabel("Stop");
        redCardPanel.add(stopLabel);
        deckPanel.add("red", redCardPanel);
        
        contentPane.add(deckPanel, BorderLayout.CENTER);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setBackground(Color.white);
        buttonPanel.setLayout(new FlowLayout());
        JButton stopButton = new JButton("Red");
        stopButton.addActionListener(this);
        buttonPanel.add(stopButton);
        JButton goButton = new JButton("Green");
        goButton.addActionListener(this);
        buttonPanel.add(goButton);
        JButton resetButton = new JButton("Reset");
        resetButton.addActionListener(this);
        buttonPanel.add(resetButton);
        contentPane.add(buttonPanel, BorderLayout.SOUTH);
        dealer.first(deckPanel);//Optional
   }

   public void actionPerformed(ActionEvent e)
   {
       String actionCommand = e.getActionCommand();

       if (actionCommand.equals("Red"))
           dealer.show(deckPanel, "red");
       else if (actionCommand.equals("Green"))
           dealer.show(deckPanel, "green");
       else if (actionCommand.equals("Reset"))
           dealer.show(deckPanel, "start");
       else
           System.out.println("Error in CardLayout Demo.");
    }

    public static void main(String[] args)
    {
        CardLayoutDemo demoGui = new CardLayoutDemo();
        demoGui.setVisible(true);
    }
}