Find Duplicates in Array Using Java | Easiest HashSet Method (O(n))

Описание: Learn how to find duplicate elements in an array using Java with the easiest and fastest O(n) logic — the HashSet method.
In this video, I’ll teach the logic using pen and paper, walk through each step clearly, and then implement it in IntelliJ IDEA.

Perfect for beginners and anyone preparing for interviews!

👉 What you’ll learn:
✔ How to detect duplicates using HashSet (O(n) time)
✔ How the Seen Set logic works
✔ Why HashMap can be used for counting duplicates
✔ Clean explanation using pen & paper
✔ Full Java code + IntelliJ execution
✔ Best approach for coding interviews

📌 Example covered in the video:
[3, 5, 2, 3, 8, 2, 5, 10]

📌 Java code used in this video:
(You can paste the final code here or I can generate it if you want)

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Java #Coding #DataStructures #JavaTutorial #InterviewPreparation #IntelliJ #ProgrammingForBeginners