Uses of Interface java.util.Map.Entry (Java Platform SE 8 )
Date: 2026-07-22

## Uses of Interface
java.util.Map.Entry

- Packages that use Map.Entry
  Package | Description
  --- | ---
  java.awt | Contains all of the classes for creating user interfaces and for painting graphics and images.
  java.security | Provides the classes and interfaces for the security framework.
  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.
  java.util.jar | Provides classes for reading and writing the JAR (Java ARchive) file format, which is based on the standard ZIP file format with an optional manifest file.
  javax.management.openmbean | Provides the open data types and Open MBean descriptor classes.
  javax.script | The scripting API consists of interfaces and classes that define Java TM Scripting Engines and provides a framework for their use in Java applications.

- - ### Uses of Map.Entry in java.awt

    Methods in java.awt that return types with arguments of type Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `Set<Map.Entry<Object,Object>>` | RenderingHints.`entrySet()` Returns a `Set` view of the mappings contained in this `RenderingHints`.

  - ### Uses of Map.Entry in java.security

    Methods in java.security that return types with arguments of type Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `Set<Map.Entry<Object,Object>>` | Provider.`entrySet()` Returns an unmodifiable Set view of the property entries contained in this Provider.

  - ### Uses of Map.Entry in java.util

    Classes in java.util that implement Map.Entry
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `AbstractMap.SimpleEntry<K,V>` An Entry maintaining a key and a value.
    `static class` | `AbstractMap.SimpleImmutableEntry<K,V>` An Entry maintaining an immutable key and value.

    Methods in java.util that return Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `Map.Entry<K,V>` | TreeMap.`ceilingEntry(K key)`
    `Map.Entry<K,V>` | NavigableMap.`ceilingEntry(K key)` Returns a key-value mapping associated with the least key greater than or equal to the given key, or `null` if there is no such key.
    `Map.Entry<K,V>` | TreeMap.`firstEntry()`
    `Map.Entry<K,V>` | NavigableMap.`firstEntry()` Returns a key-value mapping associated with the least key in this map, or `null` if the map is empty.
    `Map.Entry<K,V>` | TreeMap.`floorEntry(K key)`
    `Map.Entry<K,V>` | NavigableMap.`floorEntry(K key)` Returns a key-value mapping associated with the greatest key less than or equal to the given key, or `null` if there is no such key.
    `Map.Entry<K,V>` | TreeMap.`higherEntry(K key)`
    `Map.Entry<K,V>` | NavigableMap.`higherEntry(K key)` Returns a key-value mapping associated with the least key strictly greater than the given key, or `null` if there is no such key.
    `Map.Entry<K,V>` | TreeMap.`lastEntry()`
    `Map.Entry<K,V>` | NavigableMap.`lastEntry()` Returns a key-value mapping associated with the greatest key in this map, or `null` if the map is empty.
    `Map.Entry<K,V>` | TreeMap.`lowerEntry(K key)`
    `Map.Entry<K,V>` | NavigableMap.`lowerEntry(K key)` Returns a key-value mapping associated with the greatest key strictly less than the given key, or `null` if there is no such key.
    `Map.Entry<K,V>` | TreeMap.`pollFirstEntry()`
    `Map.Entry<K,V>` | NavigableMap.`pollFirstEntry()` Removes and returns a key-value mapping associated with the least key in this map, or `null` if the map is empty.
    `Map.Entry<K,V>` | TreeMap.`pollLastEntry()`
    `Map.Entry<K,V>` | NavigableMap.`pollLastEntry()` Removes and returns a key-value mapping associated with the greatest key in this map, or `null` if the map is empty.

    Methods in java.util that return types with arguments of type Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `static <K extends Comparable<? super K>,V> Comparator<Map.Entry<K,V>>` | Map.Entry.`comparingByKey()` Returns a comparator that compares `Map.Entry` in natural order on key.
    `static <K,V> Comparator<Map.Entry<K,V>>` | Map.Entry.`comparingByKey(Comparator<? super K> cmp)` Returns a comparator that compares `Map.Entry` by key using the given `Comparator`.
    `static <K,V extends Comparable<? super V>> Comparator<Map.Entry<K,V>>` | Map.Entry.`comparingByValue()` Returns a comparator that compares `Map.Entry` in natural order on value.
    `static <K,V> Comparator<Map.Entry<K,V>>` | Map.Entry.`comparingByValue(Comparator<? super V> cmp)` Returns a comparator that compares `Map.Entry` by value using the given `Comparator`.
    `Set<Map.Entry<K,V>>` | TreeMap.`entrySet()` Returns a `Set` view of the mappings contained in this map.
    `Set<Map.Entry<K,V>>` | EnumMap.`entrySet()` Returns a `Set` view of the mappings contained in this map.
    `abstract Set<Map.Entry<K,V>>` | AbstractMap.`entrySet()`
    `Set<Map.Entry<K,V>>` | Map.`entrySet()` Returns a `Set` view of the mappings contained in this map.
    `Set<Map.Entry<K,V>>` | LinkedHashMap.`entrySet()` Returns a `Set` view of the mappings contained in this map.
    `Set<Map.Entry<K,V>>` | Hashtable.`entrySet()` Returns a `Set` view of the mappings contained in this map.
    `Set<Map.Entry<K,V>>` | HashMap.`entrySet()` Returns a `Set` view of the mappings contained in this map.
    `Set<Map.Entry<K,V>>` | IdentityHashMap.`entrySet()` Returns a `Set` view of the mappings contained in this map.
    `Set<Map.Entry<K,V>>` | SortedMap.`entrySet()` Returns a `Set` view of the mappings contained in this map.
    `Set<Map.Entry<K,V>>` | WeakHashMap.`entrySet()` Returns a `Set` view of the mappings contained in this map.

    Methods in java.util with parameters of type Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `protected boolean` | LinkedHashMap.`removeEldestEntry(Map.Entry<K,V> eldest)` Returns `true` if this map should remove its eldest entry.

    Constructors in java.util with parameters of type Map.Entry
    Constructor and Description
    `SimpleEntry(Map.Entry<? extends K,? extends V> entry)` Creates an entry representing the same mapping as the specified entry.
    `SimpleImmutableEntry(Map.Entry<? extends K,? extends V> entry)` Creates an entry representing the same mapping as the specified entry.

  - ### Uses of Map.Entry in java.util.concurrent

    Methods in java.util.concurrent that return Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `Map.Entry<K,V>` | ConcurrentSkipListMap.`ceilingEntry(K key)` Returns a key-value mapping associated with the least key greater than or equal to the given key, or `null` if there is no such entry.
    `Map.Entry<K,V>` | ConcurrentSkipListMap.`firstEntry()` Returns a key-value mapping associated with the least key in this map, or `null` if the map is empty.
    `Map.Entry<K,V>` | ConcurrentSkipListMap.`floorEntry(K key)` Returns a key-value mapping associated with the greatest key less than or equal to the given key, or `null` if there is no such key.
    `Map.Entry<K,V>` | ConcurrentSkipListMap.`higherEntry(K key)` Returns a key-value mapping associated with the least key strictly greater than the given key, or `null` if there is no such key.
    `Map.Entry<K,V>` | ConcurrentSkipListMap.`lastEntry()` Returns a key-value mapping associated with the greatest key in this map, or `null` if the map is empty.
    `Map.Entry<K,V>` | ConcurrentSkipListMap.`lowerEntry(K key)` Returns a key-value mapping associated with the greatest key strictly less than the given key, or `null` if there is no such key.
    `Map.Entry<K,V>` | ConcurrentSkipListMap.`pollFirstEntry()` Removes and returns a key-value mapping associated with the least key in this map, or `null` if the map is empty.
    `Map.Entry<K,V>` | ConcurrentSkipListMap.`pollLastEntry()` Removes and returns a key-value mapping associated with the greatest key in this map, or `null` if the map is empty.
    `Map.Entry<K,V>` | ConcurrentHashMap.`reduceEntries(long parallelismThreshold, BiFunction<Map.Entry<K,V>,Map.Entry<K,V>,? extends Map.Entry<K,V>> reducer)` Returns the result of accumulating all entries using the given reducer to combine values, or null if none.

    Methods in java.util.concurrent that return types with arguments of type Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `Set<Map.Entry<K,V>>` | ConcurrentHashMap.`entrySet()` Returns a `Set` view of the mappings contained in this map.
    `Set<Map.Entry<K,V>>` | ConcurrentSkipListMap.`entrySet()` Returns a `Set` view of the mappings contained in this map.

    Method parameters in java.util.concurrent with type arguments of type Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `void` | ConcurrentHashMap.`forEachEntry(long parallelismThreshold, Consumer<? super Map.Entry<K,V>> action)` Performs the given action for each entry.
    `<U> void` | ConcurrentHashMap.`forEachEntry(long parallelismThreshold, Function<Map.Entry<K,V>,? extends U> transformer, Consumer<? super U> action)` Performs the given action for each non-null transformation of each entry.
    `Map.Entry<K,V>` | ConcurrentHashMap.`reduceEntries(long parallelismThreshold, BiFunction<Map.Entry<K,V>,Map.Entry<K,V>,? extends Map.Entry<K,V>> reducer)` Returns the result of accumulating all entries using the given reducer to combine values, or null if none.
    `Map.Entry<K,V>` | ConcurrentHashMap.`reduceEntries(long parallelismThreshold, BiFunction<Map.Entry<K,V>,Map.Entry<K,V>,? extends Map.Entry<K,V>> reducer)` Returns the result of accumulating all entries using the given reducer to combine values, or null if none.
    `Map.Entry<K,V>` | ConcurrentHashMap.`reduceEntries(long parallelismThreshold, BiFunction<Map.Entry<K,V>,Map.Entry<K,V>,? extends Map.Entry<K,V>> reducer)` Returns the result of accumulating all entries using the given reducer to combine values, or null if none.
    `<U> U` | ConcurrentHashMap.`reduceEntries(long parallelismThreshold, Function<Map.Entry<K,V>,? extends U> transformer, BiFunction<? super U,? super U,? extends U> reducer)` Returns the result of accumulating the given transformation of all entries using the given reducer to combine values, or null if none.
    `double` | ConcurrentHashMap.`reduceEntriesToDouble(long parallelismThreshold, ToDoubleFunction<Map.Entry<K,V>> transformer, double basis, DoubleBinaryOperator reducer)` Returns the result of accumulating the given transformation of all entries using the given reducer to combine values, and the given basis as an identity value.
    `int` | ConcurrentHashMap.`reduceEntriesToInt(long parallelismThreshold, ToIntFunction<Map.Entry<K,V>> transformer, int basis, IntBinaryOperator reducer)` Returns the result of accumulating the given transformation of all entries using the given reducer to combine values, and the given basis as an identity value.
    `long` | ConcurrentHashMap.`reduceEntriesToLong(long parallelismThreshold, ToLongFunction<Map.Entry<K,V>> transformer, long basis, LongBinaryOperator reducer)` Returns the result of accumulating the given transformation of all entries using the given reducer to combine values, and the given basis as an identity value.
    `<U> U` | ConcurrentHashMap.`searchEntries(long parallelismThreshold, Function<Map.Entry<K,V>,? extends U> searchFunction)` Returns a non-null result from applying the given search function on each entry, or null if none.

  - ### Uses of Map.Entry in java.util.jar

    Methods in java.util.jar that return types with arguments of type Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `Set<Map.Entry<Object,Object>>` | Attributes.`entrySet()` Returns a Collection view of the attribute name-value mappings contained in this Map.

  - ### Uses of Map.Entry in javax.management.openmbean

    Methods in javax.management.openmbean that return types with arguments of type Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `Set<Map.Entry<Object,Object>>` | TabularDataSupport.`entrySet()` Returns a collection view of the index to row mappings contained in this `TabularDataSupport` instance.

  - ### Uses of Map.Entry in javax.script

    Methods in javax.script that return types with arguments of type Map.Entry
    Modifier and Type | Method and Description
    --- | ---
    `Set<Map.Entry<String,Object>>` | SimpleBindings.`entrySet()` Returns a `Set` view of the mappings contained in this map.

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