[問題] Java garbage collection
不知道大家覺得下面題目的答案是多少?
我不確定是單選還是多選，我自己覺得只有3是對的，想跟大家討論看看!
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You are concerned that your program may attempt to use more memory than
is available.
To avoid this situation you want to ensure that the Java Virtual Machine will
run its garbage collection just before you start a complex routine.
What can you do to be certain that garbage collection will run when you want?
1) You cannot be certain when garbage collection will run.
2) Use the Runtime.gc() method to force garbage collection.
3) Ensure that all the variables you require to be garbage collected are
set to null.
4) Use the System.gc() method to force garbage collection.
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