phantom-reference

The documentation for Soft -, Weak - and PhantomReference s all include a line simiar to the following (taken from PhantomReference ): At that time it will atomically clear all phantom references to that object and all phantom references to any other phantom-reachable objects from which that object...

Javadoc 8 for PhantomReference states: Phantom references are most often used for scheduling pre-mortem cleanup actions in a more flexible way than is possible with the Java finalization mechanism. So I tried creating a thread that is calling the close() method of a Test Object that is eligible for...

I'm trying to implement a mechanism that deletes cached files when the objects that hold them die, and decided to use PhantomReference s to get notified on garbage collection of an object. The problem is I keep experiencing weird behavior of the ReferenceQueue . When I change something in my code it...

PhantomReference java doc for java 8 and less looks like this: Phantom reference objects, which are enqueued after the collector determines that their referents may otherwise be reclaimed. Phantom references are most often used for scheduling pre-mortem cleanup actions in a more flexible way than is...

I have a PR, an object O to which the PR points, and an RQ set up for PR. I have a thread which keeps on polling the RQ, and at the first reference it finds in RQ, the thread prints the time at which it found it, and exits. Things work fine, but the moment O has a finalize (no matter how trivial),...

I try to understand class ReferenceQueue It is optional constructor argument for SoftReference and WeakReference Also it is mandatory argument for PhantomReference . According information I have read I can write some thesises a)for PhantomReference method get always returns null b) for Phantom...

Possible Duplicate: Have you ever used Phantom reference in any project? I have read about the different types of reference. I understand how strong, soft and weak references work. But when I read about phantom references, I could not really understand them. Maybe because I could not find any good...

Java allow to write: new PhantomReference(new Object(), null) At this case new Object() will be collected? As I understand, phantom reference is alternative of finalize() method usage. And after appearing reference in queue, I need to do some additional actions and then run clear() java doc stays:...

Can someone explain the difference between the three Reference classes (or post a link to a nice explanation)? SoftReference > WeakReference > PhantomReference , but when would I use each one? Why is there a WeakHashMap but no SoftHashMap or PhantomHashMap ? And if I use the following code......

I have read this article about the topic, but I don't really understand it. Please give me some advice along with examples when describing the concepts. Paolo Maresca Java provides two different types/classes of Reference Objects : strong and weak . Weak Reference Objects can be further divided into...