Frame Attack!

[Douglas McAuley]

I am trying to create a quiz program but each time I move to the new question I create a brand new frame each time. Is there any way that I can destroy the previous frame without having to start all over again.
Thanks..........code below.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Quiz extends JFrame implements ItemListener,ActionListener
{
JRadioButton radio1, radio2, radio3, radio4;
ButtonGroup group;
Button b;
JTextField text;
JLabel jl;
public void showGui()
{
Container contentPane = getContentPane();
contentPane.setLayout(new GridLayout(0,1));
jl = new JLabel("(1) Who played the guitar solo on Peg?");
contentPane.add(jl);
group = new ButtonGroup();
radio1 = new JRadioButton("Dennis Dias.");
radio2 = new JRadioButton("Walter Becker.");
radio3 = new JRadioButton("Steve Gadd.");
radio4 = new JRadioButton("Jeff Skunk Baxter");
group.add(radio1);
group.add(radio2);
group.add(radio3);
group.add(radio4);
radio1.addItemListener(this);
radio2.addItemListener(this);
radio3.addItemListener(this);
radio4.addItemListener(this);
contentPane.add(radio1);
contentPane.add(radio2);
contentPane.add(radio3);
contentPane.add(radio4);
text = new JTextField(15);
contentPane.add(text);
b = new Button("Question Two.");
b.addActionListener(this);
contentPane.add(b);
setSize(350,300);
setVisible(true);
}
public static void main(String args[])
{
Quiz f = new Quiz();
f.showGui();
f.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
f.addWindowListener(new WindowAdapter() {
public void windowClosed(WindowEvent e) {
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == b) {
Quiz2 f = new Quiz2();
f.showGui2();
}
}
public void itemStateChanged(ItemEvent e)
{
if (e.getItemSelectable() == radio1) {
text.setText("Dennis Dias.");
} else if (e.getItemSelectable() == radio2) {
text.setText("Walter Becker.");
} else if (e.getItemSelectable() == radio3) {
text.setText("Steve Gadd.");
} else if (e.getItemSelectable() == radio4) {
text.setText("Jeff Skunk Baxter.");
}
}
class Quiz2 extends JFrame implements ItemListener,ActionListener
{
public void showGui2()
{
Container contentPane = getContentPane();
contentPane.setLayout(new GridLayout(0,1));
jl = new JLabel("(2) Who was the song Chain lightning written about?");
contentPane.add(jl);
group = new ButtonGroup();
radio1 = new JRadioButton("The Christians.");
radio2 = new JRadioButton("The Klu Klux Klan.");
radio3 = new JRadioButton("The Nazi Party.");
radio4 = new JRadioButton("The Mormons.");
group.add(radio1);
group.add(radio2);
group.add(radio3);
group.add(radio4);
radio1.addItemListener(this);
radio2.addItemListener(this);
radio3.addItemListener(this);
radio4.addItemListener(this);
contentPane.add(radio1);
contentPane.add(radio2);
contentPane.add(radio3);
contentPane.add(radio4);
text = new JTextField(15);
contentPane.add(text);
b = new Button("Question Three.");
b.addActionListener(this);
contentPane.add(b);
setSize(350,300);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == b) {
Quiz3 f = new Quiz3();
f.showGui3();
}
}
public void itemStateChanged(ItemEvent e)
{
if (e.getItemSelectable() == radio1) {
text.setText("The Christians.");
} else if (e.getItemSelectable() == radio2) {
text.setText("The Klu Klux Klan.");
} else if (e.getItemSelectable() == radio3) {
text.setText("The Nazi Party.");
} else if (e.getItemSelectable() == radio4) {
text.setText("The Mormons.");
}
}
}

class Quiz3 extends JFrame implements ItemListener,ActionListener
{
public void showGui3()
{
Container contentPane = getContentPane();
contentPane.setLayout(new GridLayout(0,1));
jl = new JLabel("(3) What famous guitarist played on 'Time out of mind'?");
contentPane.add(jl);
group = new ButtonGroup();
radio1 = new JRadioButton("Eric Clapton.");
radio2 = new JRadioButton("BB King.");
radio3 = new JRadioButton("George Benson.");
radio4 = new JRadioButton("Mark Knopfler.");
group.add(radio1);
group.add(radio2);
group.add(radio3);
group.add(radio4);
radio1.addItemListener(this);
radio2.addItemListener(this);
radio3.addItemListener(this);
radio4.addItemListener(this);
contentPane.add(radio1);
contentPane.add(radio2);
contentPane.add(radio3);
contentPane.add(radio4);
text = new JTextField(15);
contentPane.add(text);
b = new Button("Question Four.");
b.addActionListener(this);
contentPane.add(b);
setSize(350,300);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == b) {
Quiz4 f = new Quiz4();
f.showGui4();
}
}
public void itemStateChanged(ItemEvent e)
{
if (e.getItemSelectable() == radio1) {
text.setText("Eric Clapton.");
} else if (e.getItemSelectable() == radio2) {
text.setText("BB King.");
} else if (e.getItemSelectable() == radio3) {
text.setText("George Benson.");
} else if (e.getItemSelectable() == radio4) {
text.setText("Mark Knopfler.");
}
}
}

class Quiz4 extends JFrame implements ItemListener//ActionListener
{
public void showGui4()
{
Container contentPane = getContentPane();
contentPane.setLayout(new GridLayout(0,1));
jl = new JLabel("(4) Who played the keyboard solo on 'Black Cow'?");
contentPane.add(jl);
group = new ButtonGroup();
radio1 = new JRadioButton("Donald Fagen.");
radio2 = new JRadioButton("Herbie Hancock.");
radio3 = new JRadioButton("Victor Feldman.");
radio4 = new JRadioButton("Tino Beggs.");
group.add(radio1);
group.add(radio2);
group.add(radio3);
group.add(radio4);
radio1.addItemListener(this);
radio2.addItemListener(this);
radio3.addItemListener(this);
radio4.addItemListener(this);
contentPane.add(radio1);
contentPane.add(radio2);
contentPane.add(radio3);
contentPane.add(radio4);
text = new JTextField(15);
contentPane.add(text);
b = new Button("Question Five.");
//b.addActionListener(this);
contentPane.add(b);
setSize(350,300);
setVisible(true);
}
//public void actionPerformed(ActionEvent e) {
//if(e.getSource() == b);
//Quiz f = new Quiz();
//f.ShowGui4();
//}
public void itemStateChanged(ItemEvent e)
{
if (e.getItemSelectable() == radio1) {
text.setText("Donald Fagen.");
} else if (e.getItemSelectable() == radio2) {
text.setText("Herbie Hancock.");
} else if (e.getItemSelectable() == radio3) {
text.setText("Victor Feldman.");
} else if (e.getItemSelectable() == radio4) {
text.setText("Tino Beggs.");
}
}
}}

[Randall Twede]

i wrote a quiz once. i stored the questions and answers in a file. it is an applet that talks with a servlet, but the code might help you.

import java.awt.*; 
import java.awt.event.*; 
import java.applet.*;
import java.io.*;
import java.net.*;
import java.util.*; 
public class Quiz extends Applet implements ActionListener {
  private int total = 10000;
  private boolean correct;
  private String correctAnswer;
  private String label;
  private Vector theQuestions = new Vector();
  private Vector theAnswers = new Vector();
  public void init() {
    setLayout(new BorderLayout());
    setBackground(Color.black);
    setForeground(Color.white);
    Label choose = new Label("Choose difficulty level");
    add(choose, "North");
    Button button1 = new Button("Easy");
    Button button2 = new Button("Medium");
    Button button3 = new Button("Hard");
    button1.setForeground(Color.black);
    button2.setForeground(Color.black);
    button3.setForeground(Color.black);
    button1.addActionListener(this);
    button2.addActionListener(this);
    button3.addActionListener(this);
    Panel choices = new Panel();
    choices.add(button1);
    choices.add(button2);
    choices.add(button3);
    add(choices, "Center");
  }
  
  public void actionPerformed(ActionEvent e) {
    label = ((Button)e.getSource()).getLabel();
    if(label.equals("Go")) {
      displayAnswer();
    }
    else if(label.equals("Next")) {
      displayQuiz();
    }
    else if(label.equals("Quit")) {
      quit();
    }
    else {
      try {
        loadQuiz(label);
      }
      catch(IOException ex) {
        System.out.println("Cannot load question bank");
      }
    }
  }
  
  public void loadQuiz(String selection) throws IOException {
    URL url = new URL( getDocumentBase(), selection + ".txt");
    BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
    String question = null;
    while((question = in.readLine())!= null) {
      String[] answers = new String[4];
      answers[0] = in.readLine();
      answers[1] = in.readLine();
      answers[2] = in.readLine();
      answers[3] = in.readLine();
      theQuestions.addElement(question);
      theAnswers.addElement(answers);
    }
    in.close();
    displayQuiz();
  }
  public void displayQuiz() {
    removeAll();
    final CheckboxGroup cbg = new CheckboxGroup();
    ItemListener il = new ItemListener() {
      public void itemStateChanged(ItemEvent e) {
        if(((cbg.getSelectedCheckbox()).getLabel()).equals(correctAnswer)) {
          correct = true;
        }
        else {
          correct = false;
        }
      }
    };
    Label instructions = new Label("Select only one answer.");
    int i = (int)(Math.random() * theQuestions.size());
    TextArea question = new TextArea((String)theQuestions.elementAt(i), 6, 20, TextArea.SCROLLBARS_NONE);
    question.setBackground(Color.black);
    question.setEditable(false);
    String[] answers = new String[4];
    answers = (String[])theAnswers.elementAt(i);
    int j = (int)(Math.random()*4);
    String temp = answers[j];
    answers[j] = answers[0];
    answers[0] = temp;
    correctAnswer = answers[j];
    Button submit = new Button("Go");
    submit.setForeground(Color.black);
    submit.addActionListener(this);
    Panel choices = new Panel();
    choices.setLayout(new GridLayout(4,1));
    Checkbox cb1 = new Checkbox(answers[0], cbg, false);
    Checkbox cb2 = new Checkbox(answers[1], cbg, false);
    Checkbox cb3 = new Checkbox(answers[2], cbg, false);
    Checkbox cb4 = new Checkbox(answers[3], cbg, false);
    cb1.addItemListener(il);
    cb2.addItemListener(il);
    cb3.addItemListener(il);
    cb4.addItemListener(il);
    choices.add(cb1);
    choices.add(cb2);
    choices.add(cb3);
    choices.add(cb4);
    add(instructions, "North");
    add(question, "West");
    add(choices, "Center");
    add(submit, "South");
    validate();
    theQuestions.removeElementAt(i);
    theAnswers.removeElementAt(i);
  }
  
  public void displayAnswer() {
    removeAll();
    Label answer = new Label("The correct answer is: " + correctAnswer); 
    String bal = "You still have " + total + " Gold Pieces.";
    String result = "Sorry";
    if(correct) {
      result = "Yes";
      total += 10000;
      bal = "You now have " + total + " Gold Pieces.";
    }
    Label balance = new Label(bal);
    Panel message = new Panel();
    message.setLayout(new GridLayout(2, 1));
    message.add(answer);
    message.add(balance);
    add(message, "Center");
    add(new Label(result), "North");
    Button next = new Button("Next");
    next.setForeground(Color.black);
    next.addActionListener(this);
    Button quit = new Button("Quit");
    quit.setForeground(Color.black);
    quit.addActionListener(this);
    Panel choices = new Panel();
    if(theQuestions.size() > 0) {
      choices.add(next);
    }
    else {
      choices.add(new Label("That's all the questions for now."));
    }
    choices.add(quit);
    add(choices, "South");
    validate();
  }
  public void quit() {
    String location = "http://javaguy.yi.org/examples/servlet/StartingBalanceServlet?balance=" + total;
    try {
      URL url = new URL(location);
      URLConnection con = url.openConnection();
      AppletContext ac = getAppletContext();
      URL next = new URL("http://javaguy.yi.org/examples/MoreQuiz.html");
      ac.showDocument(next, "_self");
    }
    catch(Exception e) {
      System.out.println("Cannot open connection to server");
    }
  }
}