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Is there a way to ensure gc() will run?

 
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Which of the following will ensure that garbage collection runs?

a) System.gc()
b) Runtime.gc()
c) System.RunTime().gc()
d) None of these options

Since there is no way to predict the behavior of scheduling of the GC, I chose d.

But the correct answer is a.

Why is that?
 
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I've seen that one on the examulator page. The answer is definitely "D" and I'm pretty sure it graded it appropriately for me. You may want to submit it to the author.
 
Firas Zuriekat
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OK, thanks. I will because it says System.gc() is the answer,
 
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System.gc()
Runtime.getRuntime().gc() will only ask compiler to run but it will not make sure to run gc, so i think D is correct not A.
 
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I have just take a look at what I believe is the question (I cannot be absolutly sure without a question id) and option D is given as the answer along with the following comment.

"This is a slight "trick" question in that it asks which option ensures that Garbage collection will run. The programmer can never be sure that garbage collection be run, though it can be suggested with the System.gc() method call"

Marcus
 
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