![]() ![]() Let us discuss how HashMap works internally in brief. If the key is null then that element will be stored in a zero location in Entry array. It does not allow any duplicate key and allows only one null key. It internally uses the Hashing technique to find the exact bucket number and hence can provide constant-time performance for the basic operations such as to get and put. HashMap is an implementation of the Map interface that provides storage for key-value pairs. ![]() First, we will discuss how the HashMap provided in Java API actually works internally in brief so that it will be easier with its custom implementation and then we will implement different CRUD operations such as put(), get(), delete() on the HashMap and it's best and worst-case complexity. In this article, we will be creating a custom HashMap implementation in Java. ![]()
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