Map Interface

A map is an object, which stores data in the form of relationships between keys and values.

• A map cannot contain duplicate keys; each key can map to at most one value. If key information is known, its value can be retrieved from the Map object.

• Following are the classes that implement Map interface:

 –HashMap

·         Subclass of AbstractMap used to create hash tables

 –TreeMap

·         Subclass of AbstractMap used to create trees