![]() Some implementations allow null key and null value ( HashMap and LinkedHashMap) but some does not ( TreeMap). Instead, it starts an independent branch in the Java Collections Framework, as shown in the following diagram: Characteristics of a Map:Because a Map is not a true collection, its characteristics and behaviors are different than the other collections like List or Set.A Map cannot contain duplicate keys and each key can map to at most one value. The following picture illustrates a map: Note that a Mapis not considered to be a true collection, as the Map interface does not extend the Collection interface. It models the function abstraction in mathematics. Overview of Map Collection A Map is an object that maps keys to values, or is a collection of attribute-value pairs. How to make a Map collection thread-safeġ.How to perform bulk operations with Maps.How to iterate over a Map (using Collection views).How to perform basic operations on a Map.3 implementations of Map in the Java Collections Framework: HashMap, TreeMap and LinkedHashMap. ![]() This tutorial helps you understand and master Map - a member in the Java Collections Framework.
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