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Q: 

System.identityHashCode() and compacting garbage collectors

Possible Duplicate:
How does the JVM ensure that System.identityHashCode() will never change?

I was just wondering how System.identityHashCode() is able to always yield the same result for a given object, even if the garbage collector moves it around in memory. Does every object have an additional invisible field storing its identity, independent from its current address?

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