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Returns the invoking sorted set's comparator. If the natural ordering is used for this set, null is returned.
Returns the first element in the invoking sorted set.
SortedSet headSet(Object end)
Returns a SortedSet containing those elements less than end that are contained in the invoking sorted set. Elements in the returned sorted set are also referenced by the invoking sorted set.
Returns the last element in the invoking sorted set.
SortedSet tailSet(Object start)
Returns a SortedSet that contains those elements greater than or equal to start that are contained in the sorted set. Elements in the returned set are also referenced by the invoking object.