How to enable a disabled radio button????

Question

Hi here is the problem i have, i have a number of radio buttons contained in a buton group, all the buttons bar the first one are disabled. The buttons are all drawn on a JPanel. What i want to be able to do is once the enabled button has been selected, I want to enable the next button in the gropu and also then disable the one that was previously enabled. Is there any way i can do this, below is the code i have for setting the group up, and trying the above probelm. Any help much appreciated Thanks.
/* Function creates a radio button and adds it to the button group */
     public JRadioButton getRadioButton(String myString, boolean val)
          JRadioButton myButton=new JRadioButton(myString);
          myButton.setActionCommand(myString);
          myButton.addActionListener(myListener);
          myButton.setEnabled(val);
          group.add(myButton);
          return myButton;
//adds the radio buttons to the panel, for each transition */
     public void addTranPan()
               for(int i = 0; i < dCreate.char2.size(); i ++)
               if (i == 0) mPanel.add(getRadioButton(dCreate.char2.elementAt(0).toString(),true));
               else
mPanel.add(getRadioButton(dCreate.char2.elementAt(i).toString(),false));
public void ChangeButtonState()
Component [] components = getContentPane().getComponents();
          for (int i = 0; i < components.length; i++)
               Component c = components;
               if (c instanceof JRadioButton)
               JRadioButton rb = (JRadioButton) c;
               rb.setEnabled(false);
               if (c.getName().equals(ch)) //find button to enable
               JRadioButton rb = (JRadioButton) c;
               rb.setEnabled(true);
               break;
          mPanel.repaint();

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class sol21 extends JFrame implements ItemListener {
JRadioButton
   radio1 = new JRadioButton("One"),
   radio2 = new JRadioButton("Two"),
   radio3 = new JRadioButton("Three"),
   radio4 = new JRadioButton("Four");
  JRadioButton[] radios = {
    radio1, radio2, radio3, radio4
  int INITIAL_ENABLED = 0;
  public sol21() {
    ButtonGroup group = new ButtonGroup();
    JPanel panel = new JPanel(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.insets = new Insets(5,0,5,0);
    gbc.anchor = gbc.WEST;
    gbc.gridwidth = gbc.REMAINDER;
    for(int j = 0; j < radios.length; j++) {
      radios[j].addItemListener(this);
      group.add(radios[j]);
      panel.add(radios[j], gbc);
      if(j == INITIAL_ENABLED)
        continue;
      radios[j].setEnabled(false);
    setContentPane(panel);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(300,200);
    setLocation(300,200);
    setVisible(true);
  public void itemStateChanged(ItemEvent e) {
    JRadioButton button = (JRadioButton)e.getItemSelectable();
    if(e.getStateChange() == ItemEvent.SELECTED) {
      int index = 0;
      for(int j = 0; j < radios.length; j++)
        if(radios[j] == button)
          index = j;
      radios[(index + 1) % radios.length].setEnabled(true);
      if(index == 0)
        index = radios.length;
      radios[(index - 1) % radios.length].setEnabled(false);
  public static void main(String[] args) {
    new sol21();
}