code: public int[] hash(Key k){
        byte[] b = k.getBytes();
        if (b == null) {
          throw new NullPointerException("buffer reference is null");
        }
        if (b.length == 0) {
          throw new IllegalArgumentException("key length must be > 0");
        }
        int[] result = new int[nbHash];
        for (int i = 0, initval = 0; i < nbHash; i++) {
  	  initval = hashFunction.hash(b, initval);
  	  result[i] = Math.abs(initval % maxValue);
        }
        return result;
    }
docs: Hashes a specified key into several integers.
  @param k The specified key.
  @return The array of hashed values.