code: public static boolean isUpperCase(final String value) {
          validate(value, NULL_STRING_PREDICATE, NULL_STRING_MSG_SUPPLIER);
          for (int i = 0; i < value.length(); i++) {
              if (Character.isLowerCase(value.charAt(i))) {
                  return false;
              }
          }
          return true;
      }
docs: Verifies if String is uppercase
  
  @param value The input String
  @return true if String is uppercase false otherwise