Java Object.hashCode() – address or random()?

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.hashCode() native implementation depends on JVM.

E.g. HotSpot has 6 Object.hashCode() implementations. You can choose it using -XX:hashCode=n flag running JVM via command line, where n:

0 – Park-Miller RNG (default)
1 – f(address, global_statement)
2 – constant 1
3 – Serial counter
4 – Object address
5 – Thread-local Xorshift

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