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According to the _Java Language Specification_, §17.7, "Non-Atomic Treatment of {{double}} and {{long}}" \[[JLS 2005|AA. Bibliography#JLSReferences#JLS 05]\]: |
This behavior is implementation specific; Java virtual machines are free to perform writes to
longanddoublevalues atomically or in two parts. For the purposes of the Java programming language memory model, a single write to a non-volatilelongordoublevalue is treated as two separate writes: one to each 32-bit half. This can result in a situation where a thread sees the first 32 bits of a 64-bit value from one write, and the second 32 bits from another write.
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