org.apache.commons.collections4

## Interface Put<K,V>

- Type Parameters:
    `K` - the type of the keys in this map
    `V` - the type of the values in this map
  All Known Subinterfaces:
    BidiMap<K,V>, BoundedMap<K,V>, IterableMap<K,V>, IterableSortedMap<K,V>, MultiMap<K,V>, OrderedBidiMap<K,V>, OrderedMap<K,V>, SortedBidiMap<K,V>, Trie<K,V>
  All Known Implementing Classes:
    AbstractBidiMapDecorator, AbstractBitwiseTrie, AbstractDualBidiMap, AbstractHashedMap, AbstractIterableMap, AbstractLinkedMap, AbstractMapDecorator, AbstractOrderedBidiMapDecorator, AbstractOrderedMapDecorator, AbstractReferenceMap, AbstractSortedBidiMapDecorator, AbstractSortedMapDecorator, CaseInsensitiveMap, CompositeMap, DefaultedMap, DualHashBidiMap, DualLinkedHashBidiMap, DualTreeBidiMap, DualTreeBidiMap.ViewMap, FixedSizeMap, FixedSizeSortedMap, Flat3Map, HashedMap, LazyMap, LazySortedMap, LinkedMap, ListOrderedMap, LRUMap, MultiKeyMap, MultiValueMap, PassiveExpiringMap, PatriciaTrie, PredicatedMap, PredicatedSortedMap, ReferenceIdentityMap, ReferenceMap, SingletonMap, StaticBucketMap, TransformedMap, TransformedSortedMap, TransformedSplitMap, TreeBidiMap, UnmodifiableBidiMap, UnmodifiableMap, UnmodifiableOrderedBidiMap, UnmodifiableOrderedMap, UnmodifiableSortedBidiMap, UnmodifiableSortedMap, UnmodifiableTrie

      public interface Put<K,V>

  The "write" subset of the `Map` interface.

  NOTE: in the original `Map` interface, `Map.put(Object, Object)` is known to have the same return type as `Map.get(Object)`, namely `V`. `Put` makes no assumptions in this regard (there is no association with, nor even knowledge of, a "reading" interface) and thus defines `put(Object, Object)` as returning `Object`.

  Since:
    4.0
  See Also:
    `Get`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `clear()`
    `Object` | `put(K key, V value)` Note that the return type is Object, rather than V as in the Map interface.
    `void` | `putAll(Map<? extends K,? extends V> t)`

- - ### Method Detail

    - #### clear

          void clear()

      See Also:
        `Map.clear()`

    - #### put

          Object put(K key,
                     V value)

      Note that the return type is Object, rather than V as in the Map interface. See the class Javadoc for further info.
      Parameters:
        `key` - key with which the specified value is to be associated
        `value` - value to be associated with the specified key
      Returns:
        the previous value associated with `key`, or `null` if there was no mapping for `key`. (A `null` return can also indicate that the map previously associated `null` with `key`, if the implementation supports `null` values.)
      See Also:
        `Map.put(Object, Object)`

    - #### putAll

          void putAll(Map<? extends K,? extends V> t)

      Parameters:
        `t` - mappings to be stored in this map
      See Also:
        `Map.putAll(Map)`

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