public boolean suchen(String knotenName){

      for (Knoten name: knotenIndizes.keySet()){
            String key =   name.toString();
            String value = knotenIndizes.get(name).toString();
            System.out.println(key + " " + value + " "+ (name.hashCode() == knotenName.hashCode()) + " " + name.equals(knotenName));
        }

         if (knotenIndizes.containsKey(knotenName)){
            System.out.println("Knoten " + knotenName + " an Stelle " + knotenIndizes.get(knotenName));
            return true;
        }
         else
         {
            System.out.println("Knoten " + knotenName+ " existiert nicht");
            return false;
        }
    }