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