mb.java

非富多彩的十六个J2ME的例子

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class MB extends MIDlet implements CommandListener
{
	private Display dis;
	private Form frm1,frm2;
	private Command cmdexit,cmdok,cmdback;
	Ticker tick1,tick2;
  public MB()
  {
  	dis=Display.getDisplay(this);
  	
  	frm1=new Form("MB");
  	frm2=new Form("back");
  	
  	StringItem str1=new StringItem("hello word","");
  	frm1.append(str1);
  	
  	cmdexit=new Command("Exit",Command.EXIT,2);
  	frm1.addCommand(cmdexit);
  	frm1.setCommandListener(this);
  	frm1.setTicker(tick1);
  	cmdok=new Command("OK",Command.OK,0);
  	frm1.addCommand(cmdok);
  	frm1.setCommandListener(this);
  	frm1.setTicker(tick1);
  	//dis.setCurrent(frm1);
  	
  	StringItem str2=new StringItem("welcome to ","");
  	cmdback=new Command("Back",Command.BACK,1);
  	frm2.addCommand(cmdback);
  	frm2.addCommand(cmdexit);
  	frm2.setCommandListener(this);
  	frm2.setTicker(tick2);
  	dis.setCurrent( frm2);
  }	
  
  public void commandAction(Command c, Displayable d)
  {
  	if(c==cmdexit)
  	   destroyApp(true);
  	else if(c==cmdok)
  	  dis.setCurrent(frm2);
  	else if(c==cmdback)
  	  dis.setCurrent(frm1);
  	
  } 
 
  
  public void startApp() throws MIDletStateChangeException
  {
  	dis.setCurrent(frm1);
  	//dis.setCurrent(frm2);
    	
  }
  
  public void destroyApp(boolean unconditional) 
  {
     notifyDestroyed();	
  }
  public  void pauseApp() 
  {} 
 
}