code: public final <T extends GraphObject> GraphObjectList<T> getGraphObjectListAs(Class<T> graphObjectClass) {
          if (graphObjectList == null) {
              return null;
          }
          return graphObjectList.castToListOf(graphObjectClass);
      }
docs: The list of graph objects returned for this request, if any, cast into a particular type of GraphObject.
  
  @param graphObjectClass the GraphObject-derived interface to cast the graph objects into
  @return the list of graph objects returned, or null if none was returned (or if the result was not a list)
  @throws FacebookException If the passed in Class is not a valid GraphObject interface