第一个手机程序---简单菜单

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class helloworld extends MIDlet {
 private Form f=new Form("请你选择相应的操作");
 private Display dis;
 private Command screen=new Command("screen",Command.SCREEN,1);
 private Command back=new Command("back",Command.BACK,1);
 private Command cancel=new Command("cancel",Command.CANCEL,1);
 private Command exit=new Command("exit",Command.EXIT,1);
 private Command help=new Command("help",Command.HELP,1);
 private Command item=new Command("item",Command.ITEM,1);
 private Command ok=new Command("ok",Command.OK,1);
 private Command stop=new Command("stop",Command.STOP,1);

 //WTK优先级级为item,screen,ok,help,back,exit,canle,stop
 //左软键优先级为back ,cancel,exit.stop

//相同类型的按钮的排序以优先级数为依据

 public helloworld() {
  // TODO Auto-generated constructor stub
  dis=Display.getDisplay(this);
  dis.setCurrent(f);
  f.addCommand(screen);
  f.addCommand(back);
  f.addCommand(cancel);
  f.addCommand(exit);
  f.addCommand(help);
  f.addCommand(item);
  f.addCommand(ok);
  f.addCommand(stop);
  
 
 }

 protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
  // TODO Auto-generated method stub
  
 }

 protected void pauseApp() {
  // TODO Auto-generated method stub

 }

 protected void startApp() throws MIDletStateChangeException {
  // TODO Auto-generated method stub
  
  
 }

}