code: static ReversePurgeLongHashMap getInstance(final String string) {
      final String[] tokens = string.split(",");
      if (tokens.length < 2) {
        throw new SketchesArgumentException(
            "String not long enough to specify length and capacity.");
      }
      final int numActive = Integer.parseInt(tokens[0]);
      final int length = Integer.parseInt(tokens[1]);
      final ReversePurgeLongHashMap table = new ReversePurgeLongHashMap(length);
      int j = 2;
      for (int i = 0; i < numActive; i++) {
        final long key = Long.parseLong(tokens[j++]);
        final long value = Long.parseLong(tokens[j++]);
        table.adjustOrPutValue(key, value);
      }
      return table;
    }
docs: Returns an instance of this class from the given String,
  which must be a String representation of this class.
  
  @param string a String representation of this class.
  @return an instance of this class.