Package 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, AbstractPatriciaTrie, 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

Modifier and Type	Method	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 Details

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)