在Java中建立ig事前关系

Question

I know, that there are two way to establish happens-before relationship in java: synchronized blocks and methods, volatile keyword. (if i'm correct, it doesn't work with final fields). My question is: do atomic variables from concurrent package behave alike? can happens-before be established by them?

Answer 1

yes, they are thread safe and thus you can determine happens/before and after relationships.

AtomicXxxx class operations use volatile, CAS, atomic add or lazy/unordered set. All have some thread safety guarantees but are more light weight than synchronized.