Map and HashMap Program in Java for Interview | Java Tutorial in Hindi

Map and HashMap in Java | Map and HashMap Program in Java for Interview | Java Tutorial in Hindi




Map:
A map is a collection of key-value pairs where each key is unique. It is also known as a dictionary, associative array, or symbol table in some programming languages.
Maps provide efficient look-up and retrieval of values based on their corresponding keys. The keys in a map are used to uniquely identify and access the associated values.


HashMap:
A hash map is an implementation of a map that uses a hashing function to map keys to their corresponding values.
It is a data structure that provides fast retrieval and insertion operations. In a hash map, the keys are hashed to generate an index,
which is used to store and retrieve the corresponding value. The hashing function aims to distribute the keys uniformly across the available storage space to minimize collisions.


Usage:
Hash maps are widely used in various programming languages and applications. They are suitable for scenarios where fast look-up and retrieval based on keys are required,
such as caching, indexing, symbol tables, and implementing associative arrays.


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