GUI advice

Question

HI there, ive written a class to display a Jframe with a "next button to generate a new pane withoin the frame, rather like a wizard setup. the trouble is, when I hit next, the pane doesnt update proberly and only displays the card of the previous pane. CAn anyone help me?? My class is included below:
import java.text.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.UIManager;
public class StartFrame extends JFrame implements ActionListener, ItemListener
   private JComboBox typeOfPlayer;
   JPanel cards1,cards2; //a panel that uses CardLayout
   JPanel card1a, card1b, card1c,card2a, card2b,card2c;
   JPanel comboBoxPane_1, comboBoxPane_2;
   final static String SELECT_USER1 = "Please select the type of player for player 1";
   final static String SELECT_USER2 = "Please select the type of player for player 2";
   final static String HUMAN = "Human";
   final static String COMPUTER = "Computer";
   private JButton nextFrame1, nextFrame2, submit1, submit2;
   private Player play1,play2;
   private JComboBox cb1,cb2;
   private JTextField name;
   DraughtsBoard board;
   public StartFrame(Player p1, Player p2, DraughtsBoard db)
      setDefaultCloseOperation(DISPOSE_ON_CLOSE);
      setSize(200, 300);
      play1 = p1;
      play2 = p2;
      board = db;
      try
         UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
      } catch (Exception e)
         UIManager.getSystemLookAndFeelClassName();
      //Create and set up the content pane.
      addComponentToPane(this.getContentPane());
      //Display the window.
      this.pack();
      this.setVisible(true);
   public void addComponentToPane(Container pane)
      //Put the JComboBox in a JPanel to get a nicer look.
      comboBoxPane_1 = new JPanel(); //use FlowLayout
      String comboBoxItems1[] =
      { SELECT_USER1, HUMAN, COMPUTER };
      cb1 = new JComboBox(comboBoxItems1);
      cb1.setEditable(false);
      cb1.addItemListener(this);
      comboBoxPane_1.add(cb1);
      //Create the "cards".
      card1a = new JPanel();
      card1b = new JPanel();
      String levels[] =
      {"Beginner", "intermediate", "expert"};
      JComboBox levelOfDifficulty = new JComboBox(levels);
      card1b.add(new JLabel("Select Level"));
      card1b.add(levelOfDifficulty);
      nextFrame1 = new JButton("next");
      card1b.add(nextFrame1);
        nextFrame1.addActionListener(this);
      card1c = new JPanel();
      card1c.add(new JLabel("Enter name"));
      name = new JTextField(20);
      card1c.add(name);
      nextFrame2 = new JButton("next");
       card1c.add(nextFrame2);
      nextFrame2.addActionListener(this);
      //Create the panel that contains the "cards".
      cards1 = new JPanel(new CardLayout());
      cards1.add(card1a, SELECT_USER1);
      cards1.add(card1b, COMPUTER);
      cards1.add(card1c, HUMAN);
      pane.add(comboBoxPane_1, BorderLayout.PAGE_START);
      pane.add(cards1, BorderLayout.CENTER);
   public void resetFrame()
      //System.out.println("in reset frame");
      this.getContentPane().remove(comboBoxPane_1);
      comboBoxPane_2 = new JPanel(); //use FlowLayout
      String comboBoxItems2[] =
      { SELECT_USER2, HUMAN, COMPUTER };
    //  System.out.println("combo contents "+SELECT_USER2+ HUMAN+COMPUTER);
      cb2 = new JComboBox(comboBoxItems2);
      cb2.setEditable(false);
      cb2.addItemListener(this);
      comboBoxPane_2.add(cb2);
      //amend the cards
      card2a = new JPanel();
      card2b = new JPanel();
      submit1= new JButton("submit");
       String levels[] =
      {"Beginner", "intermediate", "expert"};
      JComboBox levelOfDifficulty = new JComboBox(levels);
      card2b.add(new JLabel("Select Level"));
      card2b.add(levelOfDifficulty);
      card2b.add(submit1);
      submit1.addActionListener(this);
      card2c = new JPanel();
      card2c.add(new JLabel("Enter name"));
      submit2 = new JButton("submit");
      name = new JTextField(20);
      card2c.add(submit2);
      submit2.addActionListener(this);
      cards2 = new JPanel(new CardLayout());
      cards2.add(card2a, SELECT_USER2);
      cards2.add(card2b, COMPUTER);
      cards2.add(card2c, HUMAN);
      getContentPane().add(comboBoxPane_2, BorderLayout.PAGE_START);
      getContentPane().add(cards2, BorderLayout.CENTER);
      this.getContentPane().repaint();
   public void itemStateChanged(ItemEvent evt)
      if(evt.getItemSelectable()==cb1)
         System.out.println("cb1");
         CardLayout cl = (CardLayout)(cards1.getLayout());
         cl.show(cards1, (String)evt.getItem());
      if(evt.getItemSelectable()==cb2)
         System.out.println("cb2");
         CardLayout c2 = (CardLayout)(cards2.getLayout());
         c2.show(cards2, (String)evt.getItem());
}any help would be most appreciated

Answer 1

Make sure you remove all the panels from the frame before adding new panels
i.e. frame.getContentPane().removeAll() and frame.getContentPane().validate()