public static Set<VariableElement>
            fieldsIn(Set<? extends Element> elements) {
        return setFilter(elements, FIELD_KINDS, VariableElement.class);
    }
public static Set < VariableElement > fieldsIn ( Set < ? extends Element > elements ) { return setFilter ( elements , FIELD_KINDS , VariableElement . class ) ; }
Returns a set of fields in {@code elements}.
@return a set of fields in {@code elements}
@param elements the elements to filter