## Package org.apache.commons.collections.keyvalue

This package contains implementations of collection and map related key/value classes.

See:
Description

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

## Package org.apache.commons.collections.keyvalue Description

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

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