private void notifyRemoved(List<AirMapTraffic> removed){
  if (removed == null || removed.isEmpty()) {
    return;
  }
  for (  AirMapTrafficListener listener : listeners) {
    listener.onRemoveTraffic(removed);
  }
}

private void notifyRemoved ( List < AirMapTraffic > removed ) { if ( removed == null || removed . isEmpty ( ) ) { return ; } for ( AirMapTrafficListener listener : listeners ) { listener . onRemoveTraffic ( removed ) ; } }
notify the listeners that traffic has been removed
