java - hashCode uniqueness

Question

Is it possible for two instances of Object to have the same hashCode()?

In theory an object's hashCode is derived from its memory address, so all hashCodes should be unique, but what if objects are moved around during GC?

Answer 1

I think the docs for object's hashCode method state the answer.

"As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)"