/**
* {@inheritDoc}
*
* @see java.util.NavigableSet#pollLast()
* @since 1.6
*/
public E pollLast() {
Map.Entry<E, Object> entry = backingMap.pollLastEntry();
return (null == entry) ? null : entry.getKey();
}
/** @since 1.6 */
public E pollLast() {
Map.Entry<E, ?> e = m.pollLastEntry();
return (e == null) ? null : e.getKey();
}