Assess HashMap vs ConcurrentHashMap

Q: Assess HashMap vs ConcurrentHashMap

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Question

Is Java's HashMap thread-safe? Explain why or why not. How does ConcurrentHashMap achieve thread safety and performance (e.g., lock striping, CAS operations, non-blocking reads, tree bins under high collisions, resizing strategy) in modern JDKs? Discuss typical pitfalls and when to prefer each.

Assess HashMap vs ConcurrentHashMap

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