I want to make a window GUI that contains the following:

(top) - 3 tabs leading to League, Player, and Club menus (default is to
display League).
(underneath tabs) - a main frame with various nested panels.

I cannot get this code to do this.  It just displays the tabs, and the
league frame, but when I click the tabs it doesnt change at all.  Can anyone
point me in the right direction?

Thanks,

Zac

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

public class GUI implements ActionListener {

   JFrame frame;
   JPanel leaguemenu, clubmenu, playermenu;
   final static String LOOKANDFEEL = null;

    ///////////// CONSTRUCTOR /////////////
   public GUI() {  //static?
       //Set the look and feel.
       initLookAndFeel();
       //Make sure we have nice window decorations.
       JFrame.setDefaultLookAndFeelDecorated(true);
       // set up the main window
       frame = new JFrame("League Administrator (Zac Craven - 2004)");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.setSize(new Dimension(120, 40));

       Component tabs = createTabs();
       Component leaguemenu = leagueMenu();
       Component clubmenu = clubMenu();
       Component playermenu = playerMenu();

       frame.getContentPane().add(tabs, BorderLayout.NORTH);
       frame.getContentPane().add(leaguemenu, BorderLayout.CENTER);
       //  frame.getContentPane().add(clubmenu, BorderLayout.CENTER);
       frame.pack();
       frame.setVisible(true);
   }

   public Component leagueMenu(){
       JPanel league = new JPanel();
       Component buttons = createLeagueButtons();
       Component display = createDisplay();
       league.add(buttons, BorderLayout.EAST);
       league.add(display, BorderLayout.WEST);
       return league;
   }

   public Component clubMenu(){
       JPanel club = new JPanel();
       Component buttons = createClubButtons();
       Component display = createDisplay();
       club.add(buttons, BorderLayout.EAST);
       club.add(display, BorderLayout.WEST);
       return club;
   }

   public Component playerMenu(){
       JPanel player = new JPanel();
       player.setLayout(new GridLayout(0,1));
       Component buttons = createPlayerButtons();
       Component display = createDisplay();
       player.add(buttons, BorderLayout.EAST);
       player.add(display, BorderLayout.WEST);
       return player;
   }

   public Component createTabs(){
       JTabbedPane tabbedPane = new JTabbedPane();

       JComponent leaguemenu = makeTextPanel("the League Menu");
       tabbedPane.addTab("League Menu", leaguemenu);
       tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);

       JComponent panel2 = makeTextPanel("da club");
       tabbedPane.addTab("Club Menu", clubmenu);
       tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);

       JComponent panel3 = makeTextPanel("da player");
       tabbedPane.addTab("Player Menu", playermenu);
       tabbedPane.setMnemonicAt(2, KeyEvent.VK_3);

       return tabbedPane;
   }

   protected JComponent makeTextPanel(String text) {
       JPanel panel = new JPanel(false);
       JLabel filler = new JLabel(text);
       filler.setHorizontalAlignment(JLabel.CENTER);
       panel.setLayout(new GridLayout(1, 1));
       panel.add(filler);
       return panel;
   }

   public Component createLeagueButtons() {

       JPanel toolbar = new JPanel();
       toolbar.setLayout(new GridLayout(0,1));
       JButton createClubButton = new JButton("Create Club");
       toolbar.add(createClubButton);
       JButton addClubButton = new JButton("Add Club");
       toolbar.add(addClubButton);

       JPanel flow = new JPanel();
       flow.add(toolbar);
       return flow;
   }

   public Component createClubButtons() {
       JPanel toolbar = new JPanel();
       toolbar.setLayout(new GridLayout(0,1));
       JButton addPlayerButton = new JButton("Add Player");
       toolbar.add(addPlayerButton);
       JPanel flow = new JPanel();
       flow.add(toolbar);
       return flow;
   }

   public Component createPlayerButtons() {
       JPanel toolbar = new JPanel();
       toolbar.setLayout(new GridLayout(0,1));
       JButton addPlayerButton = new JButton("Add Player?");
       toolbar.add(addPlayerButton);
       JPanel flow = new JPanel();
       flow.add(toolbar);
       return flow;
   }

   public Component createDisplay() {

       //Create the display panel for the clubs in the league.
       JPanel displayPanel = new JPanel();

       //Add various widgets to the sub panels.
  //     addWidgets();

       //Create the main panel to contain the two sub panels.
       JPanel mainPanel = new JPanel();
       mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.PAGE_AXIS));
       // Add border around the select panel

mainPanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createT
itledBorder("Premiership"),
       BorderFactory.createEmptyBorder(5,5,5,5)));

       //Add display panels to the main panel.
       mainPanel.add(displayPanel);
       return mainPanel;
   }

   public void actionPerformed(ActionEvent e) {
    //   numClicks++;
      // label.setText(labelPrefix + numClicks);
   }

//dont worry about stuff below here //
   private static void initLookAndFeel() {
       String lookAndFeel = null;

       if (LOOKANDFEEL != null) {
           if (LOOKANDFEEL.equals("Metal")) {
               lookAndFeel =
UIManager.getCrossPlatformLookAndFeelClassName();
           } else if (LOOKANDFEEL.equals("System")) {
               lookAndFeel = UIManager.getSystemLookAndFeelClassName();
           } else if (LOOKANDFEEL.equals("Motif")) {
               lookAndFeel =
"com.sun.java.swing.plaf.motif.MotifLookAndFeel";
           } else if (LOOKANDFEEL.equals("GTK+")) {
               lookAndFeel = "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
           } else {
               System.err.println("Unexpected value of LOOKANDFEEL
specified: "
                                  + LOOKANDFEEL);
               lookAndFeel =
UIManager.getCrossPlatformLookAndFeelClassName();
           }

           try {
               UIManager.setLookAndFeel(lookAndFeel);
           } catch (ClassNotFoundException e) {
               System.err.println("Couldn't find class for specified look
and feel:"
                                  + lookAndFeel);
               System.err.println("Did you include the L&F library in the
class path?");
               System.err.println("Using the default look and feel.");
           } catch (UnsupportedLookAndFeelException e) {
               System.err.println("Can't use the specified look and feel ("
                                  + lookAndFeel
                                  + ") on this platform.");
               System.err.println("Using the default look and feel.");
           } catch (Exception e) {
               System.err.println("Couldn't get specified look and feel ("
                                  + lookAndFeel
                                  + "), for some reason.");
               System.err.println("Using the default look and feel.");
               e.printStackTrace();
           }
       }
   }

   private static void createAndShowGUI() {
       //Make sure we have nice window decorations.
       JFrame.setDefaultLookAndFeelDecorated(true);
       GUI app = new GUI();
   }

   public static void main(String[] args) {
       //Schedule a job for the event-dispatching thread:
       //creating and showing this application's GUI.
       javax.swing.SwingUtilities.invokeLater(new Runnable() {
           public void run() {
               createAndShowGUI();
           }
       });
   }
}