What are the performance benefits of using ConcurrentHashMap?

What are the performance benefits of using ConcurrentHashMap over HashMap?

ConcurrentHashMap offers better performance in multi-threaded environments by allowing concurrent access without locking the entire map.

How does it achieve this concurrency?

It uses a technique called lock striping, which divides the map into segments, allowing multiple threads to access different segments simultaneously.

Are there any downsides to using ConcurrentHashMap?

Yes, while it provides better concurrency, it may have slightly higher overhead compared to HashMap due to its internal structure.

In what scenarios should I prefer ConcurrentHashMap?

You should prefer ConcurrentHashMap in applications with high read and write operations from multiple threads, like web servers or real-time data processing.