## Uses of Interface
java.util.NavigableSet

- Packages that use NavigableSet
  Package | Description
  --- | ---
  java.util | Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).
  java.util.concurrent | Utility classes commonly useful in concurrent programming.

- - ### Uses of NavigableSet in java.util

    Classes in java.util that implement NavigableSet
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `TreeSet<E>` A `NavigableSet` implementation based on a `TreeMap`.

    Methods in java.util that return NavigableSet
    Modifier and Type | Method | Description
    --- | --- | ---
    `static <E> NavigableSet<E>` | Collections.`checkedNavigableSet(NavigableSet<E> s, Class<E> type)` Returns a dynamically typesafe view of the specified navigable set.
    `NavigableSet<K>` | NavigableMap.`descendingKeySet()` Returns a reverse order `NavigableSet` view of the keys contained in this map.
    `NavigableSet<K>` | TreeMap.`descendingKeySet()`
    `NavigableSet<E>` | TreeSet.`descendingSet()`
    `NavigableSet<E>` | NavigableSet.`descendingSet()` Returns a reverse order view of the elements contained in this set.
    `static <E> NavigableSet<E>` | Collections.`emptyNavigableSet()` Returns an empty navigable set (immutable).
    `NavigableSet<E>` | TreeSet.`headSet(E toElement, boolean inclusive)`
    `NavigableSet<E>` | NavigableSet.`headSet(E toElement, boolean inclusive)` Returns a view of the portion of this set whose elements are less than (or equal to, if `inclusive` is true) `toElement`.
    `NavigableSet<K>` | NavigableMap.`navigableKeySet()` Returns a `NavigableSet` view of the keys contained in this map.
    `NavigableSet<K>` | TreeMap.`navigableKeySet()`
    `NavigableSet<E>` | TreeSet.`subSet(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)`
    `NavigableSet<E>` | NavigableSet.`subSet(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)` Returns a view of the portion of this set whose elements range from `fromElement` to `toElement`.
    `static <T> NavigableSet<T>` | Collections.`synchronizedNavigableSet(NavigableSet<T> s)` Returns a synchronized (thread-safe) navigable set backed by the specified navigable set.
    `NavigableSet<E>` | TreeSet.`tailSet(E fromElement, boolean inclusive)`
    `NavigableSet<E>` | NavigableSet.`tailSet(E fromElement, boolean inclusive)` Returns a view of the portion of this set whose elements are greater than (or equal to, if `inclusive` is true) `fromElement`.
    `static <T> NavigableSet<T>` | Collections.`unmodifiableNavigableSet(NavigableSet<T> s)` Returns an unmodifiable view of the specified navigable set.

    Methods in java.util with parameters of type NavigableSet
    Modifier and Type | Method | Description
    --- | --- | ---
    `static <E> NavigableSet<E>` | Collections.`checkedNavigableSet(NavigableSet<E> s, Class<E> type)` Returns a dynamically typesafe view of the specified navigable set.
    `static <T> NavigableSet<T>` | Collections.`synchronizedNavigableSet(NavigableSet<T> s)` Returns a synchronized (thread-safe) navigable set backed by the specified navigable set.
    `static <T> NavigableSet<T>` | Collections.`unmodifiableNavigableSet(NavigableSet<T> s)` Returns an unmodifiable view of the specified navigable set.

  - ### Uses of NavigableSet in java.util.concurrent

    Classes in java.util.concurrent that implement NavigableSet
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `ConcurrentSkipListSet<E>` A scalable concurrent `NavigableSet` implementation based on a `ConcurrentSkipListMap`.

    Methods in java.util.concurrent that return NavigableSet
    Modifier and Type | Method | Description
    --- | --- | ---
    `NavigableSet<K>` | ConcurrentSkipListMap.`descendingKeySet()`
    `NavigableSet<K>` | ConcurrentNavigableMap.`descendingKeySet()` Returns a reverse order `NavigableSet` view of the keys contained in this map.
    `NavigableSet<E>` | ConcurrentSkipListSet.`descendingSet()` Returns a reverse order view of the elements contained in this set.
    `NavigableSet<E>` | ConcurrentSkipListSet.`headSet(E toElement)`
    `NavigableSet<E>` | ConcurrentSkipListSet.`headSet(E toElement, boolean inclusive)`
    `NavigableSet<K>` | ConcurrentSkipListMap.`keySet()` Returns a `NavigableSet` view of the keys contained in this map.
    `NavigableSet<K>` | ConcurrentNavigableMap.`keySet()` Returns a `NavigableSet` view of the keys contained in this map.
    `NavigableSet<K>` | ConcurrentSkipListMap.`navigableKeySet()`
    `NavigableSet<K>` | ConcurrentNavigableMap.`navigableKeySet()` Returns a `NavigableSet` view of the keys contained in this map.
    `NavigableSet<E>` | ConcurrentSkipListSet.`subSet(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)`
    `NavigableSet<E>` | ConcurrentSkipListSet.`subSet(E fromElement, E toElement)`
    `NavigableSet<E>` | ConcurrentSkipListSet.`tailSet(E fromElement)`
    `NavigableSet<E>` | ConcurrentSkipListSet.`tailSet(E fromElement, boolean inclusive)`

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2026, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.