Radiobutton

import javax.microedition.midlet.MIDlet;
//import javax.microedition.lcdui.*;

import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemStateListener;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.Displayable;
public class RadioButtons extends MIDlet implements ItemStateListener,CommandListener
{
 private Display d;
 private Form f;
 private Command exit;
 private Item it;
 private ChoiceGroup rb;
 private int n;
 private int rn;
 public RadioButtons()
 {
  //   d=new Display("");
  //   d.getDisplay(this);
  d=Display.getDisplay(this);
  f=new Form("");
  rb=new ChoiceGroup("select color", Choice.EXCLUSIVE);
  rb.append("Red", null);
  rb.append("white",null);
  rb.append("Blue",null);
  rb.append("Green",null);
  //n=rb.append("all",null);//append method returns index no of the optionr
  //rb.setSelectedIndex(rn,true);//optional
  rb.append("all",null);
  exit=new Command("Exit",Command.EXIT,1);
  //f=new Form("");
//  n=f.append(rb);//omits output is not displayed
  f.append(rb);
  f.addCommand(exit);
  f.setCommandListener(this);
  f.setItemStateListener(this);//omits,selected item is not displayed
   //d=Display.getDisplay(this);//we can write here also
 }
 public void startApp()
 {
   d.setCurrent(f);
 }
 public void pauseApp()
 {
 }
 public void destroyApp(boolean un)
 {
 }
 public void commandAction(Command c, Displayable dis)
 {
  if(c==exit)
  {
   destroyApp(true);
   notifyDestroyed();
  }
 }
public void itemStateChanged(Item i)
{
 if(i==rb)
 {
  StringItem si=new StringItem("selected",rb.getString(rb.getSelectedIndex()));
  f.append(si);
 }
}
}