Package org.apache.commons.collections4.keyvalue

This package contains implementations of collection and map related key/value classes. These are usually used in maps, however they can be used as data holders in any collection.

The following key/value designs are included:

• Map Entry - various map entry implementations
• KeyValue - a key and value pair, without map entry semantics
• MultiKey - a holder of multiple keys tied together

Class Summary

Class	Description
AbstractKeyValue<K,V>	Abstract pair class to assist with creating KeyValue and Map.Entry implementations.
AbstractMapEntry<K,V>	Abstract Pair class to assist with creating correct Map.Entry implementations.
AbstractMapEntryDecorator<K,V>	Provides a base decorator that allows additional functionality to be added to a Map.Entry.
DefaultKeyValue<K,V>	A mutable KeyValue pair that does not implement Map.Entry.
DefaultMapEntry<K,V>	A restricted implementation of Map.Entry that prevents the Map.Entry contract from being broken.
MultiKey<K>	A MultiKey allows multiple map keys to be merged together.
TiedMapEntry<K,V>	A Map.Entry tied to a map underneath.
UnmodifiableMapEntry<K,V>	A Map.Entry that throws UnsupportedOperationException when setValue is called.