HashMap Internal Working in Java | HashMap Explained with Diagram | Interview Questions
Автор: VigorousCoding
Загружено: 2026-01-17
Просмотров: 58
In this video, we deep dive into the internal working of HashMap in Java.
This is one of the most important and frequently asked Java interview topics.
You will understand:
• How HashMap stores data internally
• What happens during put() and get()
• Why HashMap is O(1) on average
• What is hash collision and how HashMap handles it
• LinkedList vs Red-Black Tree (Java 8 improvement)
• When treeification happens (bucket size greater than 8 and capacity 64 or more)
• equals() and hashCode() contract (Golden Rule)
This video is useful for:
✔ Java interview preparation
✔ Backend developers
✔ 2–6 years experienced Java developers
✔ Anyone who wants to master Java collections
Watch till the end to avoid common interview mistakes with HashMap.
📌 Follow @vigrousCoding for more Java interview and backend concepts.
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