| Name | Description | Type | Package | Framework |
| AbstractKeyValue | Abstract pair class to assist with creating KeyValue and Map. | Class | org.apache.commons.collections4.keyvalue | Apache Commons |
| AbstractMapEntry | Abstract Pair class to assist with creating correct Map. | Class | org.apache.commons.collections4.keyvalue | Apache Commons |
| AbstractMapEntryDecorator | Provides a base decorator that allows additional functionality to be added to a Map. | Class | org.apache.commons.collections4.keyvalue | Apache Commons |
| DefaultKeyValue | A mutable KeyValue pair that does not implement Note that a DefaultKeyValue instance may not contain | Class | org.apache.commons.collections4.keyvalue | Apache Commons |
| DefaultMapEntry | A restricted implementation of Map. | Class | org.apache.commons.collections4.keyvalue | Apache Commons |
| KeyValue | Defines a simple key value pair. | Interface | org.apache.commons.collections4 | Apache Commons |
| MultiKey | A MultiKey allows multiple map keys to be merged together. | Class | org.apache.commons.collections4.keyvalue | Apache Commons |
| TiedMapEntry | A Map. | Class | org.apache.commons.collections4.keyvalue | Apache Commons |
| UnmodifiableMapEntry | A Map. | Class | org.apache.commons.collections4.keyvalue | Apache Commons |