public void updateComboBox(JComboBox<Track> box){
  box.removeAllItems();
  box.addItem(null);
  List<Track> tracks=getTrackByNameList(null);
  for (  Track track : tracks) {
    box.addItem(track);
  }
}

public void updateComboBox ( JComboBox < Track > box ) { box . removeAllItems ( ) ; box . addItem ( null ) ; List < Track > tracks = getTrackByNameList ( null ) ; for ( Track track : tracks ) { box . addItem ( track ) ; } }
updates a jcombobox with all of the track locations for this location .
