问题描述
Java线程安全中是volatile int 吗？也就是说，可以安全地读取和写入而不锁定吗？
Is a volatile int in Java thread-safe? That is, can it be safely read from and written to without locking?
推荐答案
是的，你可以从中读取并写入它安全 - 但你不能做任何复合，比如安全地增加它，因为这是一个读/修改/写周期。还有一个问题是它如何与其他变量的访问进行交互。
Yes, you can read from it and write to it safely - but you can't do anything compound such as incrementing it safely, as that's a read/modify/write cycle. There's also the matter of how it interacts with access to other variables.
volatile的确切性质令人困惑（参见，这是确保我做对的更简单方法。
The precise nature of volatile is frankly confusing (see the memory model section of the JLS for more details) - I would personally generally use AtomicInteger instead, as a simpler way of making sure I get it right.
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