question: @ SuppressWarnings ( { "unchecked" , "rawtypes" } ) private void notifyListListeners ( ) { if ( ! listListeners . isEmpty ( ) ) { List temp = new ArrayList ( sensorDataObjects . values ( ) ) ; temp . addAll ( objectStorages . values ( ) ) ; for ( ListListener < ? > listListener : listListeners ) { listListener . contentChanged ( temp ) ; } } }
target:  Notify all registered listeners that a change occurred in the lists.