/**
* {@inheritDoc}
*
* @see java.util.NavigableSet#descendingSet()
* @since 1.6
*/
public NavigableSet<E> descendingSet() {
return (null != descendingSet)
? descendingSet
: (descendingSet = new TreeSet<E>(backingMap.descendingMap()));
}
/** @since 1.6 */
public NavigableSet<E> descendingSet() {
return new TreeSet(m.descendingMap());
}