public class Stoppuhr extends Thread
{ 
  private long millis;

  public Stoppuhr()
  {
    // hat nichts zu tun, kann man weglassen.   
  }
  
  public void warte(int ms)
  {  
    try
    { Thread.sleep(ms);
    } catch (InterruptedException e) 
    { // nichts;
    } 
        
  }
  
  public void starte()
  {
    millis = System.currentTimeMillis();
  }

  public void stoppe()
  {
    millis = System.currentTimeMillis() - millis;
  }

  public long lies()
  {
    return millis;
  }
  
  public String liesString()
  {
    return String.valueOf(millis);    
  }
  
} // class Stoppuhr