code: public static <E extends Enum<E>> EnumSet<E> allOf(Class<E> elementType) {
          EnumSet<E> result = noneOf(elementType);
          result.addAll();
          return result;
      }
docs: Creates an enum set containing all of the elements in the specified
  element type.
  
  @param <E> The class of the elements in the set
  @param elementType the class object of the element type for this enum
  set
  @return An enum set containing all the elements in the specified type.
  @throws NullPointerException if <tt>elementType</tt> is null