JRadioButton Question

Question

Hi,
I have the following code
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ShowCardLayout extends JApplet implements ActionListener
     private CardLayout cardLayout = new CardLayout(20, 10);
     private JPanel cardPanel = new JPanel(cardLayout);
     JButton previous, next;
     public ShowCardLayout()
          cardPanel.setBorder(new javax.swing.border.LineBorder(Color.black));
          for(int i = 1; i <= 8; i++)
               JPanel subPanel = new JPanel(new BorderLayout());
               JLabel label = new JLabel("Question #" + i);
               JPanel buttonPanel = new JPanel();
               JRadioButton button1 = new JRadioButton("Excellent");
               JRadioButton button2 = new JRadioButton("Good");
               JRadioButton button3 = new JRadioButton("Fair");
               JRadioButton button4 = new JRadioButton("Poor");
               ButtonGroup answers = new ButtonGroup();
               buttonPanel.setLayout(new BoxLayout(buttonPanel, BoxLayout.Y_AXIS ));
               buttonPanel.add(button1);
               buttonPanel.add(button2);
               buttonPanel.add(button3);
               buttonPanel.add(button4);
               subPanel.add(label, BorderLayout.NORTH);
               subPanel.add(buttonPanel, BorderLayout.WEST);
               cardPanel.add(subPanel, String.valueOf(i));
          JPanel p = new JPanel();
          p.add(previous = new JButton("Previous"));
          p.add(next = new JButton("Next"));
          getContentPane().add(cardPanel, BorderLayout.CENTER);
          getContentPane().add(p, BorderLayout.SOUTH);
          previous.addActionListener(this);
          next.addActionListener(this);
     public void actionPerformed(ActionEvent e)
          String actionCommand = e.getActionCommand();
          if(e.getSource() instanceof JButton)
               if("Previous".equals(actionCommand))
                    cardLayout.previous(cardPanel);
               else if("Next".equals(actionCommand))
                    cardLayout.next(cardPanel);
     public static void main(String[] args)
          ShowCardLayout applet = new ShowCardLayout();
          JFrame frame = new JFrame();
          frame.setDefaultCloseOperation(3);
          frame.setTitle("ShowCardLayout");
          frame.getContentPane().add(applet, BorderLayout.CENTER);
          applet.init();
          applet.start();
          frame.setSize(570, 220);
          frame.setVisible(true);
}How can I capture button selection from each question?

Answer 1

a simple demo
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Testing extends JFrame
  final int MAX_PANELS = 5;
  CardLayout cl = new CardLayout();
  JPanel clPanel = new JPanel(cl);
  int currentPanel = 0;
  public Testing()
    setSize(300,200);
    setLocation(400,300);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    for(int x = 0; x < MAX_PANELS; x++)
      JPanel p = new JPanel();
      p.add(new JLabel("Panel "+ x));
      clPanel.add(""+x,p);
    final JButton btnPrev = new JButton("Previous");
    final JButton btnNext = new JButton("Next");
    JPanel p = new JPanel(new GridLayout(1,2,25,0));
    p.add(btnPrev);
    p.add(btnNext);
    JPanel p1 = new JPanel();
    p1.add(p);
    getContentPane().add(clPanel,BorderLayout.CENTER);
    getContentPane().add(p1,BorderLayout.SOUTH);
    btnPrev.setEnabled(false);
    btnPrev.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        cl.previous(clPanel);
        currentPanel--;
        btnNext.setEnabled(true);
        if(currentPanel == 0) btnPrev.setEnabled(false);}});
    btnNext.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        cl.next(clPanel);
        currentPanel++;
        btnPrev.setEnabled(true);
        if(currentPanel == MAX_PANELS-1) btnNext.setEnabled(false);}});
  public static void main(String[] args){new Testing().setVisible(true);}
}