Cant get subpanels to show

Question

Hi i have an application that uses subpanels within a panel. For some reason only one (the northern region panel) is showing up and i cannot figure out why. I have banged my head for hours and cant get it to work . If any one has any suggestions it would be greatly appreciated...thanks in advance!
import  java.awt.*;
import  java.awt.event.*;
import  javax.swing.*;
   A GUI application with a button for which the number
   of clicks is kept track of and displayed
   @author Jared Letendre
   @version 09-18-07
public class NicerDiceRoller extends GameDie
       creates a NicerDiceRoller frame
       @param args not used here
    public static void main(String args[])
        RollerFrame mainFrame = new RollerFrame();
        mainFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );   
        mainFrame.setVisible(true);
   A frame with a panel containing six labels and three buttons
class RollerFrame extends JFrame
       constructs a RollerFrame frame instance
    public RollerFrame()
        this.setTitle("Dice Roller");
        this.setSize(this.DEFAULT_WIDTH, this.DEFAULT_HEIGHT);
        // add RollerPanel panel to frame
        RollerPanel panel = new RollerPanel();
        this.add(panel);
    // data fields
    private final static int DEFAULT_WIDTH = 400;
    private final static int DEFAULT_HEIGHT = 400;
   A panel with six labels and three buttons, that displays the value of one of three dice
   that are rolled when each button has been clicked. Keeps track of sum of all rolls
class RollerPanel extends JPanel
       constructs a RollerPanel panel instance
    public RollerPanel()
        this.setLayout(new BorderLayout());
        // create the labels for the northern panel
        JPanel nPanel = new JPanel();
        this.add(nPanel, BorderLayout.NORTH);
        JLabel welcome = new JLabel("Nicer Dice Roller");
        JLabel myName = new JLabel("By: Jared Letendre");
        welcome.setForeground(Color.BLUE);
        nPanel.add(welcome);
        nPanel.add(myName);
        // create the label for the southern panel
        JPanel sPanel = new JPanel();
        rollValue = new JLabel();
        rollValue.setForeground(Color.BLUE);
        this.add(sPanel, BorderLayout.SOUTH);
        sPanel.add(rollValue);
        // create the spacer panels for east and west regions
        JPanel leftPanel = new JPanel();
        JLabel leftSpace = new JLabel("     ");
        this.add(leftPanel, BorderLayout.WEST);
        JPanel rightPanel = new JPanel();
        JLabel rightSpace = new JLabel("     ");
        this.add(rightPanel, BorderLayout.EAST);
        leftPanel.add(leftSpace);
        rightPanel.add(rightSpace);
        // create the labels and buttons for the center panel
        JPanel cPanel = new JPanel();
        cPanel.setLayout(new GridLayout(3, 2, 10, 5));
        this.add(cPanel, BorderLayout.CENTER);
        JButton die1 = new JButton("Roll Dice #1");
        die1.setActionCommand("firstDie");
        die1.setForeground(Color.BLUE);
        die1.setBackground(Color.RED);
        cPanel.add(die1);
        JButton die2 = new JButton("Roll Dice #2");
        die2.setActionCommand("secondDie");
        die2.setForeground(Color.BLUE);
        die2.setBackground(Color.RED);
        cPanel.add(die2);
        JButton die3 = new JButton("Roll Dice #3");
        die3.setActionCommand("thirdDie");
        die3.setForeground(Color.BLUE);
        die3.setBackground(Color.RED);
        cPanel.add(die3);
        rollSum = new JLabel();
        dice1Count = new JLabel();
        dice2Count = new JLabel();
        dice3Count = new JLabel();
        cPanel.add(dice1Count);
        cPanel.add(dice2Count);
        cPanel.add(dice3Count);
        // add labels and button to this panel
        this.add(rollSum);
        // create button action (so dice will be rolled),
        //    and associate that action with corresponding button
        RollerAction action = new RollerAction();
        die1.addActionListener(action);
        die2.addActionListener(action);
        die3.addActionListener(action);
    } // end RollerPanel constructor
       An action listener that rolls a dice based on what button is clicked
    private class RollerAction implements ActionListener
           decides which button was clicked and rolls the corresponding dice
           displays value of that roll
           accumulated the total of the three dice and displays it.
        public void actionPerformed(ActionEvent event)
            if((event.getActionCommand()).equals("firstDie"))
                 dice1.roll();
                 RollerPanel.this.rollValue.setText("Dice 1 rolled a: " + dice1.getTop());
                 temp1 = dice1.getTop();
                 RollerPanel.this.dice1Count.setText("Dice 1 rolled " + dice1.getNumRolls() + " times");
            if((event.getActionCommand()).equals("secondDie"))
                 dice2.roll();
                 RollerPanel.this.rollValue.setText("Dice 2 rolled a: " + dice2.getTop());
                 temp2 = dice2.getTop();
                 RollerPanel.this.dice2Count.setText("Dice 2 rolled " + dice2.getNumRolls() + " times");
            if((event.getActionCommand()).equals("thirdDie"))
                 dice3.roll();
                 RollerPanel.this.rollValue.setText("Dice 3 rolled a: " + dice3.getTop());
                 temp3 = dice3.getTop();
                 RollerPanel.this.dice3Count.setText("Dice 3 rolled " + dice3.getNumRolls() + " times");
            total = temp1 + temp2 + temp3;
            RollerPanel.this.rollSum.setText("Your total roll is: " + total);
    // data fields for RollerPanel
    int total = 0;
    int temp1, temp2, temp3;
    JLabel rollValue;
    JLabel rollSum;
    JLabel dice1Count;
    JLabel dice2Count;
    JLabel dice3Count;
    GameDie dice1 = new GameDie();
    GameDie dice2 = new GameDie();
    GameDie dice3 = new GameDie();
} // end of class RollerPanelEdited by: jaredL on Oct 6, 2007 12:14 PM

Answer 1

this line, near end of RollerPanel constructor is the problem
this.add(rollSum);
you've set RollerPanel as a BorderLayout, so by not specifying 'where' in the BorderLayout
rollSum is to go, it defaults to CENTER, effectively knocking out cpanel (the panel with the buttons)