HashMap internal implementation in Java or how does HashMap work internally in Java is a very important interview question. Some of the important points that you should know are- Where does HashMap store its elements internally? What is the term "bucket" in HashMap? What is hashing concept and how does it relate to HashMap? How does put() method work in HashMap? What happens if same hash is calculated for the keys or how are elements stored in case of hash collision? What happens if the null key is added. How does get() method work in HashMap? How does remove() method work in HashMap? In this post we’ll go through the HashMap internal implementation in Java and try to explain the above mentioned points. Note that all the code snippet of the HashMap class provided in this post are from JDK 10. Where does HashMap store its elements Internally HashMap class in Java uses an Array (named table ) of type Node to store its elements. Where N
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