Java volatile引用与AtomicReference [英] Java volatile reference vs. AtomicReference

问题描述

volatile 对象引用和 AtomicReference 之间是否有任何区别，以防我使用 get（） and set（） -methods from AtomicReference ？

Is there any difference between a volatile Object reference and AtomicReference in case I would just use get() and set()-methods from AtomicReference?

推荐答案

简短的答案是：不。

http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/atomic/package-summary.htmlrel =nofollow noreferrer> java.util.concurrent.atomic package doc a>：

From the java.util.concurrent.atomic package doc:

原子的访问和更新的内存效果通常遵循挥发性物质的规则：

The memory effects for accesses and updates of atomics generally follow the rules for volatiles:

• get 具有读取 volatile 变量的记忆效应。


• set 具有写入（赋值） volatile 变量的记忆效应。

• get has the memory effects of reading a volatile variable.
• set has the memory effects of writing (assigning) a volatile variable.

顺便说一下，这个包的文档很好，一切都解释了。

By the way, the doc for the package is very good and everything is explained...

lazySet （在Java 6中引入）操作引入了语义不可能通过 volatile 变量;请参阅此信息了解详情。

lazySet (introduced in Java 6) is a newer operation introduced that has semantics unachievable through volatile variables; see this post for more information.

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