CODEWITHSUNDEEP
javagarbage-collection
jayendra bhatt
jayendra bhatt

Reputation: 1385

Garbage collector don't run when object is referenced.Which object?

As there are so many objects being created for a particular class some of which could be referenced and some can be anonymously lying in the heap and hence elgible for garbage collection . So is the presence of even one non referenced object in the heap is enough for garbage collector to run or is there any other criteria to assure the garbage collector is executed.

Thanks

Jayendra

Upvotes: 0

Views: 83

Answers (2)

user1531971
user1531971

Reputation:

GC on an object is, for typical reference implementations of the JVM, completely non-deterministic. There is no way to guarantee when, or even if, the GC will be run, never mind if it will result in a particular object reference being released (and its corresponding finalizer called.) This is regardless of the state of this particular object.

As pointed out in comments, System.gc() is merely a hint or request. In a great many cases it will result in a full GC. But consider gathering a heap dump usually results in 2-3 calls to System.gc() before the dump is generated, mostly as a way to improve the chances it actually happens.

There are experimental VMs that offer various implementations of real-time guarantees where some of this is not true.

Upvotes: 1

maxormo
maxormo

Reputation: 629

we don't know when GC get executed, it depend on lots of things e.g. Type of GC. Also you can recommend to VM to launch GC by doing System.gc(). But again it is just a recommendation

Upvotes: 2

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