class Erzeuger extends Thread {
  Wert w;
  public Erzeuger (Wert w) {
    this.w = w;
  }
  public void run() {
    for (int i = 0; i < 5; i++) {
      w.put(i);
      System.out.println("Erzeuger    put: " + i);
      try {
        sleep((int)(Math.random() * 100));
      } 
      catch (InterruptedException e) {
      }
    }
  }
}