Is Random class thread safe?

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It is thread safe in the sense it will still generate random numbers when used by multiple threads.

The Sun/Oracle JVM implementation uses synchronized and AtomicLong as seed to improve consistency across threads. But it doesn’t appear to be guarenteed across all platforms in the documentation.

I wouldn’t write your program to require such a guarantee, especially as you cannot determine the order in which nextInt() will be called.

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