called to retrieve a view to a list that will be kept sorted and updated with modifications concode_field_sep Comparator<T> comparator concode_elem_sep List<T> list concode_field_sep void add concode_elem_sep int indexOfElement concode_elem_sep ListSorter<T> create concode_elem_sep ListSorter<T> create concode_elem_sep void modified concode_elem_sep void insert concode_elem_sep boolean exists concode_elem_sep void remove
List < T > function ( ) { return Collections . unmodifiableList ( list ) ; }