What are the advantages of ConcurrentHashMap?

What are the advantages of using ConcurrentHashMap over HashMap?

ConcurrentHashMap offers better concurrency, allowing multiple threads to read and write without locking the entire map.

Can you explain how it achieves better concurrency?

It uses a technique called lock striping, which divides the map into segments, allowing threads to lock only a segment instead of the whole map.

Are there any performance benefits compared to using synchronized collections?

Yes, ConcurrentHashMap generally provides higher throughput and lower contention compared to synchronized collections, especially under heavy load.

What about its memory consumption? Is it more efficient?

It can be more memory-efficient than synchronized collections because it avoids the overhead of maintaining multiple locks.