ChoiceGroup的功能与List相近，只不过是多了个Item控件，其构造方法：ChoiceGroup（标题，类型，String[],Image[]），在此程序中有个值得主题的地方：textfield.setString(group.getString(group.getSelectedIndex())); ，此句group.getSelectedIndex（）取得group第几个内容，然后group.getString转成文字并且textfield.setString显示出来，够详细了吧呵呵，以下给出完整程序：

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

public class ChoiceGroupDemo extends MIDlet implements CommandListener,ItemStateListener {

private Command exitCommand = new Command("Eixt",Command.EXIT,1);
private Display display;
private Form mainForm;
private TextField textfield;
private ChoiceGroup group;

public ChoiceGroupDemo() {

?? mainForm = new Form("Choice Group");
?????????????????????????????????????? //图片数组
?? Image[] imageArray = null;
??
?? try{
??? Image icon = Image.createImage("/1.png");
??? imageArray = new Image[]{icon,icon,icon,icon};
?? }catch(java.io.IOException err){System.out.println("Image err...");}
??
?? String[] stringArray ={"选项A","选项B","选项C","选项D"};
??????????????????????????????????????????????????????? //创建Pop-Up类型
?? group = new ChoiceGroup("Pop-Up",ChoiceGroup.POPUP,stringArray,imageArray);
?? textfield = new TextField("当前的选项为：","选项A",20,TextField.ANY);
????????????????????????????????????????????????? //可以添加控件了
?? mainForm.append(group);
?? mainForm.append(textfield);
?? mainForm.addCommand(exitCommand);
?? mainForm.setCommandListener(this);
?? mainForm.setItemStateListener(this);?? //设置了监听器
}

protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
??
??

}

?

public void commandAction(Command c, Displayable d) {???????? //处理Command事件

?? if(c == exitCommand)
?? {
??? try {
???? destroyApp(false);
??? } catch (MIDletStateChangeException e) {
???? // TODO Auto-generated catch block
???? e.printStackTrace();
??? }
??? notifyDestroyed();
?? }
??
}

public void itemStateChanged(Item item) {
?? if (item instanceof ChoiceGroup)
?? {
??? textfield.setString(group.getString(group.getSelectedIndex())); //本程序重点！取得并更新内容
??? /*TextBox tb = new TextBox("new","superise",15,0);
??? display.setCurrent(tb);*/ //这个是可以触发屏幕的更新
?? }
??
??
}

protected void pauseApp() {
??

}

protected void startApp() throws MIDletStateChangeException {
??
?? display = Display.getDisplay(this);
?? display.setCurrent(mainForm);
??

}

}