docs: public static <T> HashSet<T> newHashSet(boolean isSorted, Enumeration<T> enumration) {
  		if (null == enumration) {
  			return newHashSet(isSorted, (T[]) null);
  		}
  		final HashSet<T> set = isSorted ? new LinkedHashSet<T>() : new HashSet<T>();
  		while (enumration.hasMoreElements()) {
  			set.add(enumration.nextElement());
  		}
  		return set;
  	}