What are the differences between concurrent collections and synchronized collections?

What are the differences between concurrent collections and synchronized collections?

Concurrent collections are designed for high concurrency, allowing multiple threads to access them without locking. Synchronized collections, on the other hand, use locks to ensure that only one thread can access them at a time.

Can you give me examples of each type?

Sure! An example of a concurrent collection is ConcurrentHashMap, while Collections.synchronizedList(new ArrayList<>()) is an example of a synchronized collection.

Which one is better for performance?

Generally, concurrent collections offer better performance in multi-threaded environments because they reduce contention and allow for more parallelism.

Are there any scenarios where synchronized collections are preferred?

Yes, synchronized collections might be preferred in simpler applications where thread contention is low, as they are easier to implement and understand.