How Does HashMap Work Internally in Java?

1. Introduction HashMap is one of the most important data structures in Java used to store key-value pairs. It provides constant time complexity O(1) for put() and get() operations (on average) by using a technique called hashing. 2. Basic Working Concept Explanation HashMap internally uses: Array (Bucket array) Hashing (hashCode) Linked List / Tree (for collision handling) Each key-value pair is stored in a structure called a Node. 3. Inter