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I read that an object can be strongly, weakly or even phantom (!!!!) reachable..
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Question: I read that an object can be
strongly, weakly or even phantom (!!!!) reachable...
Answer: I found the definitions in API. I
think it is clear enough to be cited here:
Going from strongest to weakest, the different levels of
reachability reflect the life cycle of an object. They are
operationally defined as follows:
- An object is strongly reachable if it can be reached by some
thread without traversing any reference objects. A newly-created
object is strongly reachable by the thread that created it.
- An object is softly reachable if it is not strongly reachable but can be
reached by traversing a soft reference.
- An object is weakly reachable if it is neither strongly nor softly
reachable but can be reached by traversing a weak reference. When the weak
references to a weakly-reachable object are cleared,
the object becomes eligible for finalization.
- An object is phantom reachable if it is neither strongly, softly,
nor weakly reachable, it has been finalized, and some phantom
reference refers to it.
- Finally, an object is unreachable, and therefore eligible for
reclamation, when it is not reachable in any of the above ways.
About phantom reference please read more in API
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