Interface ConcurrentMap<K,V>

All Superinterfaces:

Map<K,V>

All Known Implementing Classes:

ConcurrentHashMap

public interface ConcurrentMap<K,V>
extends Map<K,V>

A map whose compound operations are atomic. The four methods it declares are default methods of Map as well; an implementation makes them atomic.

Nested Class Summary

Nested classes/interfaces inherited from interface Map

Map.Entry<K,V>

Method Summary

Modifier and Type	Method	Description
V	putIfAbsent(K key, V value)	If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value.
boolean	remove(Object key, Object value)	Removes the entry for the specified key only if it is currently mapped to the specified value.
V	replace(K key, V value)	Replaces the entry for the specified key only if it is currently mapped to some value.
boolean	replace(K key, V oldValue, V newValue)	Replaces the entry for the specified key only if currently mapped to the specified value.

Methods inherited from interface Map

clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, equals, forEach, get, getOrDefault, hashCode, isEmpty, keySet, merge, put, putAll, remove, replaceAll, size, values

Method Details

putIfAbsent

V putIfAbsent(K key,
 V value)

Description copied from interface: Map

If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value.

Specified by:

putIfAbsent in interface Map<K,V>

remove

boolean remove(Object key,
 Object value)

Description copied from interface: Map

Removes the entry for the specified key only if it is currently mapped to the specified value.

Specified by:

remove in interface Map<K,V>

replace

V replace(K key,
 V value)

Description copied from interface: Map

Replaces the entry for the specified key only if it is currently mapped to some value.

Specified by:

replace in interface Map<K,V>

replace

boolean replace(K key,
 V oldValue,
 V newValue)

Description copied from interface: Map

Replaces the entry for the specified key only if currently mapped to the specified value.

Specified by:

replace in interface Map<K,V>