prj41.java

非富多彩的十六个J2ME的例子

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.*;


public class prj41 extends MIDlet implements CommandListener
{
	Display dis;
	Form frm1=new Form("Presto Systems");
	Form frm2=new Form("Information");
	Ticker tick;
	Command cmdexit,cmdok,cmdback;
    StringItem str1;
    Calendar can=Calendar.getInstance();
    String date;
    String time;
   
   public prj41()
   {
   	
   	
   }
   
   public void startApp() throws MIDletStateChangeException
   {
   	   dis=Display.getDisplay(this);
   	   
   	   cmdexit=new Command("Exit",Command.EXIT,0);
   	   cmdok=new Command("Ok",Command.OK,1);
   	   cmdback=new Command("Back",Command.BACK,2);
   	   
   	   tick=new Ticker("Scrolling text");
   	   
   	   str1=new StringItem("Welcome to the Presto System","");
   	   date=Integer.toString(can.get(Calendar.MONTH))+"/"+Integer.toString(can.get(Calendar.DAY_OF_MONTH))+"/"+Integer.toString(can.get(Calendar.YEAR));
   	   time=Integer.toString(can.get(Calendar.HOUR))+":"+Integer.toString(can.get(Calendar.MINUTE))+":"+Integer.toString(can.get(Calendar.SECOND));
   	   
   	   frm1.addCommand(cmdexit);
   	   frm1.addCommand(cmdok);
   	   frm1.append(str1);
   	   frm1.setTicker(tick);
   	   frm1.setCommandListener(this);
   	   frm2.addCommand(cmdexit);
   	   frm2.addCommand(cmdback);
   	   frm2.append(date);
   	   frm2.append(time);
   	   dis.setCurrent(frm1);
   	
   	}
   	
   	public void pauseApp()
   	{
   		
   		
   	}
   	
   	public void destroyApp(boolean b)
   	{
   		
   		notifyDestroyed();
   	}
   	
   	public void commandAction(Command c,Displayable d)
   	{
   		if(c==cmdexit)
   		  destroyApp(true);
   		else if(c==cmdok)
   		   showform2();
   		else if(c==cmdback)
   		    showform1();
  
   	}	
   	
   	public void showform1()
   	{
   		dis.setCurrent(frm1);
   		
   	}
   	
   	
   	public void showform2()
   	{
   		frm2.setCommandListener(this);
   		dis.setCurrent(frm2);
   		
   	}
	
}