code: private String getRomanNumber(int num) {
      String roman = "";  // The roman numeral.
      int N = num;        // N represents the part of num that still has
      //   to be converted to Roman numeral representation.
      for (int i = 0; i < numbers.length; i++) {
        while (N >= numbers[i]) {
          roman += letters[i];
          N -= numbers[i];
        }
      }
      return roman;
    }
docs: Gets the Roman notation for numbers.
  @param num the integer to convert
  @return the String using the number.