HashMap vs ConcurrentHashMap (Most Asked Java Interview Question)
HashMap for single-threaded use cases.
ConcurrentHashMap for multi-threaded environments.
HashMap allows one null key, but ConcurrentHashMap does not allow null keys or values to avoid ambiguity.
ConcurrentHashMap -
Instead of locking the entire map, it uses fine-grained locking.
This means different threads can safely work on different buckets at the same time.
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