code: private final static byte[] getDecodabet(final int options) {
      if ((options & Base64.URL_SAFE) == Base64.URL_SAFE) {
        return Base64._URL_SAFE_DECODABET;
      } else if ((options & Base64.ORDERED) == Base64.ORDERED) {
        return Base64._ORDERED_DECODABET;
      } else {
        return Base64._STANDARD_DECODABET;
      }
  
    }
docs: Returns one of the _SOMETHING_DECODABET byte arrays depending on the options specified. It's
  possible, though silly, to specify ORDERED and URL_SAFE in which case one of them will be
  picked, though there is no guarantee as to which one will be picked.