Java by API/javax.microedition.lcdui/Choice

Choice.EXCLUSIVE

 
import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;
public class J2MERadioButtons1 extends MIDlet implements CommandListener {
  private Display display;
  private Form form = new Form("Gender");
  private Command exit = new Command("Exit", Command.EXIT, 1);
  private Command process = new Command("Process", Command.SCREEN, 2);
  private ChoiceGroup gender = new ChoiceGroup("Enter Gender", Choice.EXCLUSIVE);
  private int currentIndex;
  private int genderIndex;
  public J2MERadioButtons1() {
    display = Display.getDisplay(this);
    gender.append("Female", null);
    currentIndex = gender.append("Male ", null);
    gender.setSelectedIndex(currentIndex, true);
    genderIndex = form.append(gender);
    form.addCommand(exit);
    form.addCommand(process);
    form.setCommandListener(this);
  }
  public void startApp() {
    display.setCurrent(form);
  }
  public void pauseApp() {
  }
  public void destroyApp(boolean unconditional) {
  }
  public void commandAction(Command command, Displayable displayable) {
    if (command == exit) {
      destroyApp(false);
      notifyDestroyed();
    } else if (command == process) {
      currentIndex = gender.getSelectedIndex();
      StringItem message = new StringItem("Gender: ", gender.getString(currentIndex));
      form.append(message);
      form.delete(genderIndex);
      form.removeCommand(process);
    }
  }
}

Choice.IMPLICIT

   
import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.List;
import javax.microedition.midlet.MIDlet;
public class Main extends MIDlet {
  private String[] capabilitiesIdx = { "microedition.media.version", "supports.mixing",
      "supports.audio.capture", "supports.video.capture", "supports.recording", "audio.encodings",
      "video.encodings", "video.snapshot.encodings", "streamable.contents" };
  public void startApp() {
    List list = new List("Audio/Video Capabilities", Choice.IMPLICIT);
    for (int i = 0; i < capabilitiesIdx.length; ++i) {
      list.append(System.getProperty(capabilitiesIdx[i]) + " - " + capabilitiesIdx[i], null);
    }
    Display.getDisplay(this).setCurrent(list);
  }
  public void pauseApp() {
  }
  public void destroyApp(boolean unconditional) {
  }
}