Java Interview Questions:( Part -10 ): How HashMap Works Internally || The Internal Implementation

In this tutorial, we are going to learn how hashmap works internally. This is a very popular java interview question from the collection framework and has been asked so many times to check candidates understanding on Map collection.

This question is asked mostly in top MNCs such as Infosys, TCS, CTS, Wipro, Accenture, HCL, Capgemini etc.

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Difficulty: Medium
Topic: JAVA
DS: HashMap
Company: FAANG
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In this video tutorial, we will cover in detail
1. Basic syntax and working principle of HashMap
2. How internally HashMap implements the PUT function.
3. How Hashmap dynamically grow in size on runtime
4. How internally HashMap implements the GET functionality
5. Also we will see how HashMap resolves the collision.
6. Why hashmap only allows a single null value as the key element.

[IMPORTANT]

►**This video comes under "BASIC" section of interview questions.

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[imtiyazalam]

i"m watching many video but concept is not cleared but finally concept is clear after watching your video Awesome bro 💌💌💌

[marvellouschandan]

Awesome video bro. But one thing you should also add is whenever the linkedlist size reaches a threshold, the linkedlist is converted into a balanced tree to reduce the time complexity of get() operation from O(n) to O(logn).