HashMap Basics For Efficient Key-Value Pair Management In Java

HashMap is a powerful data structure in Java that allows you to store and manage key-value pairs efficiently. This guide will cover the basics of working with HashMap, including commonly used methods and examples to help you understand its usage.


  
  
  Introduction to HashMap

A HashMap stores data in the form of key-value pairs and provides constant-time complexity for basic operations like put, get, and remove (on average). Here's why HashMap is so useful:

Keys are unique, but values can be duplicated.
Keys and values can be of any object type.
It is part of the java.util package.
It al...