import javax.microedition.midlet.MIDletStateChangeException;import javax.microedition.lcdui.*; public class Hello extends javax.microedition.midlet.MIDlet implements CommandListener{ protected Form form; protected Command quit;  public Hello(){ form=new Form("我的MIDlet"); form.append("欢迎，MIDLET WORLD！");  form.setCommandListener(this); quit=new Command("离开",Command.SCREEN,1); form.addCommand(quit);         } protected void startApp() throws MIDletStateChangeException { Display.getDisplay(this).setCurrent(form); } protected void pauseApp(){     } protected void destroyApp(boolean unconditional) throws MIDletStateChangeException { }  public void commandAction(Command command,Displayable displayable) {  try{   if(command==quit){    destroyApp(true);    notifyDestroyed();      }     }  catch(MIDletStateChangeException me){} }                   }

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