In Java, is it required to synchronize write access to an array if each thread writes to a separate cell space?

Question

Is it required to synchronize write access to an array in Java if each thread writes to a separate cell space?

EDIT: Specifically, the array is eith

Answer 1

If read access is also partitioned in the same manner, then synchronization is not needed as per bkail's link.

But if the threads read each other's writes, it would still be necessary to have a memory barrier to force synchronization of cache contents. Otherwise, threadys may get inconsistent read results.