Why long and double are not atomic in Java?

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2. #single
3. #double
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6. #memory
7. #volatile
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9. #separate
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11. #length
12. #operation
13. #machine
14. #language
15. #treated
16. #longer
17. #longs
18. #model
19. #value
20. #atomic
21. #processor
22. #because
23. #level
24. #multiple