Question: How can you force garbage collection of an object?

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Question: How can you force garbage collection of an object?

A. Garbage collection cannot be forced.

B. Call System.gc()

C. Call System.gc(), passing in a reference to the object to be garbage-collected

D. Call Runtime.gc().

E. Set all references to the object to new values(null , for example).

Answer:A is correct. Garbage collection cannot be forced. Calling System.gc() or Runtime.gc() is not 100 percent reliable, since the garbage-collection thread might defer to a thread of higher priority; thus B and D are incorrect. C is incorrect because the two gc() methods do not take arguments; in fact, if you still have a reference to pass into the method, the object is not yer eligible to be collected. E will make the object eligible for collection the next time the garbage collector runs.

 

 

 

 

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Comments(2)


1. View Comment

You said the garbage collector can not be forced, option A is correct. But I read on MSDN that the GC.Collect() method forces garbage collection. The link to the statement above is here: http://msdn.microsoft.com/en-us/library/system.gc.collect(v=vs.71).aspx

View Tutorial          By: Biniam E at 2011-12-17 15:09:09
2. View Comment

GC.Collect is for .net not for java don't get confused.

View Tutorial          By: asin at 2013-06-27 15:47:35

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