java - 在Java中，如果每个线程写入单独的单元格空间，是否需要同步对数组的写入访问？

Question

如果每个线程写入单独的单元格空间，是否需要同步对Java中数组的写入访问？

编辑: 具体来说，该数组是原始数组或不可变对象(immutable对象)数组。前任。一个 int 数组或一个 String 数组。

Answer 1

不，不需要同步。

在 JLS §17.6 Word Tearing 中定义:

One implementation consideration for Java virtual machines is that every field and array element is considered distinct; updates to one field or element must not interact with reads or updates of any other field or element. In particular, two threads that update adjacent elements of a byte array separately must not interfere or interact and do not need synchronization to ensure sequential consistency.