What are the best practices for using concurrent collections in Java?

What are the best practices for using concurrent collections in Java?

When using concurrent collections in Java, it's important to choose the right collection type for your needs, such as ConcurrentHashMap or CopyOnWriteArrayList.

Can you explain why ConcurrentHashMap is preferred over HashMap?

ConcurrentHashMap allows concurrent access by multiple threads without locking the entire map, improving performance in multi-threaded environments.

What about performance trade-offs with CopyOnWriteArrayList?

CopyOnWriteArrayList is great for scenarios with more reads than writes, as it creates a new copy on each write, which can be costly.

Are there any specific scenarios where I should avoid using concurrent collections?

Yes, avoid using concurrent collections in scenarios where you need strict ordering or when the overhead of concurrency is not justified.