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Simple demo of using timers E-mail
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Timer class schedule tasks for future execution in a background thread. Tasks may be scheduled for one-time, or for repeated execution at regular intervals.

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

public class TimerMidlet extends MIDlet implements CommandListener
{
  private Display display; 
  private Form form;       
  private Command exit;    
  private Command stop;    
  private Timer timer;     
  private RunTimerTask tt; 
  private int count = 0;   

  public timerMidlet()
  {
    form = new Form("Timer");
    exit = new Command("Exit", Command.EXIT, 1);
    stop= new Command("Stop", Command.STOP, 2);
  }    

  public void startApp ()
  {
    display = Display.getDisplay(this);
    form.addCommand(exit);
    form.addCommand(stop);
    form.setCommandListener(this);

    // Repeating every 3 seconds
    timer = new Timer();
    tt = new RunTimerTask();
    timer.schedule(tt,03000);    
    display.setCurrent(form);
  }

  public void destroyApp (boolean unconditional){}

  public void pauseApp ()  { }

  public void commandAction(Command c, Displayable d)
  {
    if (c == stop)
    {
      timer.cancel();
    }
    else if (c == exit)
    {
      destroyApp(false);
      notifyDestroyed();
    }
  }

  /*--------------------------------------------------
  * RunTimerTask Class - Run the task
  *-------------------------------------------------*/  
  private class RunTimerTask extends TimerTask
  {
    public final void run()
    {
      form.append("count: " + ++count + "\n");
    }
  }
}

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