List用法一例

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class PhotoMIDlet extends MIDlet implements CommandListener
{
  String list1[]={"1","2","3"};
  private Command okCommand=new Command("确定",Command.OK,1);
  private Command backCommand=new Command("返回",Command.BACK,1);
  private Command exitCommand=new Command("退出",Command.EXIT,1);
  private List list2=new List("Photo",List.EXCLUSIVE,list1,null);
    private Display display=null;
    private Form form=new Form("Photo");
    private Image img=null;
 public PhotoMIDlet(){
  list2.addCommand(okCommand);
  list2.addCommand(exitCommand);
  list2.addCommand(backCommand);
  list2.setCommandListener(this);
  form.addCommand(okCommand);
  form.addCommand(exitCommand);
  form.addCommand(backCommand);
  form.setCommandListener(this);
  
}
  public void startApp(){
  if(display==null)
    display=Display.getDisplay(this);
  display.setCurrent(list2);
 }
  public void pauseApp(){
 
}
  public void destroyApp(boolean unkown){
 
}
  public void commandAction(Command cmd,Displayable dis){
    if(cmd==okCommand){
     int sIn=list2.getSelectedIndex();
     String str=(String)list2.getString(sIn);
     try{
       img=Image.createImage("/"+str+".png");
    }catch(Exception e){}
   form.append(img);
   display.setCurrent(form);
 }
 else if(cmd==backCommand){
  form.deleteAll();
  display.setCurrent(list2);
  }
 else if(cmd==exitCommand){
 destroyApp(true);
 notifyDestroyed();
 }
}
}