In which situations it's needed to use volatile keyword with Atomic field?

Question

In which situations it's needed to use volatile keyword with Atomic field? Or if the field is Atomic*** keyword volatile is redundant?

Thank you

Answer 1

Difference is nicely mentioned in Java Concurrency In Practice book:

• Volatile provides Memory visibility guarantee
• Atomic variables provide both Memory visibility and Atomicity

So there is no need to use volatile keyword with AtomicXXX variables.