phantom-reference

Rationale for Soft-/Weak-/PhantomReferences clearing references to objects which have reference to tracked object

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...

How to use PhantomReference as finalize() Replacement

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...

Why since java 9 PhantomReference java doc states that it is dedicated to the POST-mortem cleanup actions although it was PRE-mortem before

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...

Java: PhantomReference, ReferenceQueue and finalize

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),...

Understanding Java's Reference classes: SoftReference, WeakReference, and PhantomReference

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......

Java: difference between strong/soft/weak/phantom reference

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...