Displaying different Panels

Question

Hi,
I have a small application that will act as a quiz module for a tutorial I am writing. I am using GridBagLayout to display the first question. When the user gets the right answer or clicks a next button I want another GridBagLayout to display.
Questions:
From a design point of view I could probably use setVisable(true) or false. But is that the most efficient way to do it? If I have ten questions, I would have to create ten different objects. I've posted my code below, I just need a nudge in the right direction or a code snippet that gives me a better understanding.
Thanks,
Steve
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class TestButtonApplicationv1 {
    public static void main(String[] arguments) {
        JFrame frame = new Interface();
        frame.show();
class Interface extends JFrame {
     private dataPanel screenvar;
     private NamePass abcdef;
     private JTextArea msgout;
     Interface () {
          super("This is a JFrame");
        setSize(800, 400);  // width, height
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          JPanel pane = new JPanel();
          // create empty space
          pane.setBorder(BorderFactory.createEmptyBorder(30, 20, 10, 30)); //top, left, bottom, right
          // declare components
          msgout = new JTextArea( 8, 40 );
          NamePass testGrid = new NamePass(screenvar, msgout, abcdef);
          // end declare components
          pane.setLayout(new GridLayout(1, 4, 5, 15));   // one less object to keep track of.
          pane.add(testGrid);
             pane.add( new JScrollPane(msgout));
          msgout.append("Successful");
          setContentPane(pane);
          setVisible(true);
class updateDataFields implements ActionListener {     // 400
     private dataPanel abc;
     private NamePass  def;
     private JTextArea msg;
     int count = 0;
     public updateDataFields(dataPanel xyz, JTextArea msgout, NamePass qrs) {     // 100
          abc = xyz;
          def = qrs;
          msg = msgout;
     }     // 100
     public void actionPerformed(ActionEvent evt) {     // 200
          count++;
          String command = evt.getActionCommand();
               if (command.equals("TestMe")){     // 300
                    msg.append("\nSuccessful");
                    abc.right01.setText("1000");
                    abc.left02.setText("Hi!");
                    abc.right03.setText("123456");
               }     // 300
               if (command.equals("OK")){     // 300
                    msg.append("\nThis is the Okay Button!");
                    abc.left01.setText("1000");
                    abc.left02.setText("1100");
                    abc.left03.setText("1200");
                    abc.right01.setText("2000");
                    abc.right02.setText("2100");
                    abc.right03.setText("2200");
               }     // 300
               if (command.equals("Exit")){     // 400
                         def.answerTextA.setText("" + count);
                         msg.append("\nThis is working" + " " + count);
               }     // 400
     }     // 200
}     // 400
// This is the object that represents one complete question
class NamePass extends JPanel {
    JLabel answerTextA;
    void buildConstraints(GridBagConstraints gbc, int gx, int gy,
        int gw, int gh, int wx, int wy) {
        gbc.gridx = gx;
        gbc.gridy = gy;
        gbc.gridwidth = gw;
        gbc.gridheight = gh;
        gbc.weightx = wx;
        gbc.weighty = wy;
    public NamePass(dataPanel xyz, JTextArea msgout, NamePass qrs) {
      // set up layout
      GridBagLayout gridBag = new GridBagLayout();
      GridBagConstraints constraints = new GridBagConstraints();
      setLayout(gridBag);
      setBorder(BorderFactory.createCompoundBorder(
                                          BorderFactory.createMatteBorder(
                                                          1,1,2,2,Color.blue),
                                BorderFactory.createEmptyBorder(5,5,5,5)));
      // radio button A
      buildConstraints(constraints, 0, 0, 1, 1, 5, 5); // gx, gy, gw, gh, weightx, weighty
      JRadioButton answerA = new JRadioButton( "Answer A", true );
      constraints.fill  = GridBagConstraints.NONE;
      constraints.anchor = GridBagConstraints.WEST;
      gridBag.setConstraints(answerA, constraints);
      add(answerA);
      // radio button B
      buildConstraints(constraints, 0, 1, 1, 1, 5, 5); // gx, gy, gw, gh, weightx, weighty
      JRadioButton answerB = new JRadioButton( "Answer B", false );
       constraints.fill = GridBagConstraints.NONE;
       constraints.anchor = GridBagConstraints.WEST;
      gridBag.setConstraints(answerB, constraints);
      add(answerB);
      // radio button C
      buildConstraints(constraints, 0, 2, 1, 1, 5, 5); // gx, gy, gw, gh, weightx, weighty
      JRadioButton answerC = new JRadioButton( "Answer C", false );
       constraints.fill = GridBagConstraints.NONE;
       constraints.anchor = GridBagConstraints.WEST;
      gridBag.setConstraints(answerC, constraints);
      add(answerC);
      // radio button D
      buildConstraints(constraints, 0, 3, 1, 1, 5, 5); // gx, gy, gw, gh, weightx, weighty
      JRadioButton answerD = new JRadioButton( "Answer D", false );
       constraints.fill = GridBagConstraints.NONE;
       constraints.anchor = GridBagConstraints.WEST;
      gridBag.setConstraints(answerD, constraints);
      add(answerD);
       // answer A
      buildConstraints(constraints, 1, 0, 1, 1, 30, 5); // gx, gy, gw, gh, weightx, weighty
      answerTextA = new JLabel("Answer A");
       constraints.fill = GridBagConstraints.NONE;
       constraints.anchor = GridBagConstraints.WEST;
       gridBag.setConstraints(answerTextA, constraints);
      add(answerTextA);
      // answer B
      buildConstraints(constraints, 1, 1, 1, 1, 30, 5); // gx, gy, gw, gh, weightx, weighty
      JButton answerTextB = new JButton("Answer B");
       constraints.fill = GridBagConstraints.NONE;
       constraints.anchor = GridBagConstraints.WEST;
      gridBag.setConstraints(answerTextB, constraints);
      add(answerTextB);
      // answer C
      buildConstraints(constraints, 1, 2, 1, 1, 30, 5); // gx, gy, gw, gh, weightx, weighty
      JButton answerTextC = new JButton("Answer C");
       constraints.fill = GridBagConstraints.NONE;
       constraints.anchor = GridBagConstraints.WEST;
      gridBag.setConstraints(answerTextC, constraints);
      add(answerTextC);
      // answer D
      buildConstraints(constraints, 1, 3, 1, 1, 30, 5); // gx, gy, gw, gh, weightx, weighty
      JButton answerTextD = new JButton("Answer D");
       constraints.gridx = 1;
       constraints.gridy = 3;
       constraints.gridwidth = 1;
       constraints.gridheight = 1;
       constraints.weightx = 30;
       constraints.weighty = 5;
       constraints.fill = GridBagConstraints.NONE;
       constraints.anchor = GridBagConstraints.WEST;
      gridBag.setConstraints(answerTextD, constraints);
      add(answerTextD);
      // exit button
      buildConstraints(constraints, 0, 4, 2, 1, 0, 5); // gx, gy, gw, gh, weightx, weighty
      JButton exit = new JButton("Exit");
       constraints.fill = GridBagConstraints.NONE;
       constraints.anchor = GridBagConstraints.CENTER;
       exit.addActionListener( new updateDataFields( xyz, msgout, this ));
      gridBag.setConstraints(exit, constraints);
      add(exit);
      setVisible(true);
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

Answer 1

I don't think there is anything wrong with having ten different objects, it's more a matter of how many you want instantiated at a time.
Since it's a quiz, where every page is about the same (except for the number of questions, the text, etc.) you can probably make the quiz panel a class which takes parameters of what the options are, similarly to JOptionPane.
To switch between pages you can use a CardLayout.
Then you just have to decide how many pages you want instantiated at any point in time. You can create each one as needed, or you can create all of them at the start and use the CardLayout to move each one to the front. An in-between solution is create the next one in the background while the user is making their choice.
You might be able to find something like a Wizard component, which does similar things so you can avoid duplicating code.