What are the differences between HashSet and ConcurrentHashMap?

What are the differences between HashSet and ConcurrentHashMap?

HashSet is a collection that does not allow duplicate elements, while ConcurrentHashMap is a thread-safe map that allows concurrent access.

Can you explain how they handle concurrency?

HashSet is not thread-safe, so it can lead to issues if accessed by multiple threads simultaneously. ConcurrentHashMap, on the other hand, is designed for concurrent access, allowing multiple threads to read and write without locking the entire map.

Which one should I use for a multi-threaded application?

For a multi-threaded application, you should use ConcurrentHashMap as it provides better performance and safety in concurrent scenarios.

Are there any performance differences I should be aware of?

Yes, ConcurrentHashMap generally has better performance in multi-threaded environments due to its segmented locking mechanism, while HashSet may perform better in single-threaded scenarios.