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As you may know, Random.nextLong() does not generate all possible long values in Java. How can I check if a specific long is randomly generatable by that method?

bimbopesce
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  • Why do you want to know that? That sounds like an [XY problem](https://meta.stackexchange.com/questions/66377/what-is-the-xy-problem). – Progman Mar 06 '21 at 16:48

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First, the JavaDoc to Random says:

The implementation of {@code setSeed} by class {@code Random} happens to use only 48 bits of the given seed. In general, however, an overriding method may use all 64 bits of the {@code long} argument as a seed value.

But you may also want to check out ThreadLocalRandom since it does not appear to have the 48 bit seed limit. And it is also faster.

WJS
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