Volatile Vs Atomic [duplicate]

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The effect of the volatile keyword is approximately that each individual read or write operation on that variable is made atomically visible to all threads.

Notably, however, an operation that requires more than one read/write — such as i++, which is equivalent to i = i + 1, which does one read and one write — is not atomic, since another thread may write to i between the read and the write.

The Atomic classes, like AtomicInteger and AtomicReference, provide a wider variety of operations atomically, specifically including increment for AtomicInteger.

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