Free memory of an object in Java

Question

I created a class (assuming the Tree). Then I initialize an instance:

Tree a = new Tree()

Now I want to delete instance a and free memory allocated for it. How I can do? I hope you help me solve this problem. Thank you very much!

Assign null to your reference a. Either call gc explicity by calling System.gc() or Runtime.getRuntime().gc(). But you cannot ensure that the gc is called. — Shriram, Mar 19 '15 at 16:33
If you need to free up memory for a created object, use C. In Java, memory is released undeterministically. — fps, Mar 19 '15 at 17:52
@Shriram Please post your comment as a solution so that it can be accepted by the OP to avoid a hung question — Borodin, Mar 20 '15 at 01:49

score 0 · Answer 1 · answered Mar 19 '15 at 16:35

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You should dereference the object.then automatically during garbage collection memory will be deallocated. Dereferenceing can be done by Tree a = null;

answered Mar 19 '15 at 16:35

Vinay S Jain

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"Dereference" != "Remove a referenece". It actually means "use a reference". – RealSkeptic Mar 19 '15 at 16:38
Then to remove an reference ...what do they say..??? – Vinay S Jain Mar 19 '15 at 16:58
I don't think there is a special term for it. – RealSkeptic Mar 19 '15 at 17:11
Can u explain dereference in detail – Vinay S Jain Mar 19 '15 at 17:16

score 0 · Answer 2 · answered Mar 19 '15 at 16:46

I think that assigning a null value to an instance of a class will empty it, deleting any memory for it. Previous code:

Tree a;
a = new Tree();

New code:

Tree a;
a = new Tree();
//Empty out Tree 'a'
a = null;

Free memory of an object in Java

2 Answers2