Understanding HashMap Internals — hashCode, equals, Collisions & Performance Java
In this video, we dive deep into Java’s HashMap — how it works, why it’s so fast, and what makes it reliable (or risky). You’ll learn:
• What a HashMap is and how it stores key-value pairs 🔍
• Why we usually get O(1) time complexity for put and get
• The roles of hashCode() and equals() — and why they must be implemented carefully
• What hash collisions are, how they degrade performance, and why minimizing them matters
• The internal architecture: buckets, linked lists, and how entries are matched
Whether you’re preparing for coding interviews or want to deepen your understanding of Java collections, this video will give you clarity and confidence.
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