Replace argument with pre-sized array

[kang-hl]

Replace argument with pre-sized array

[harawata]

Hello @kang-hl ,

You submitted #2924 and then submit #2925 (this one).
You have to choose one of them and explain why.

I remembered that there was a lengthy discussion about this topic.
https://stackoverflow.com/q/174093/1261766
I am not particularly interested in this type of micro-optimization, but someone else might pick up.

[guoweixin]

看一下

[tanpenggood]

haha, using toArray (new Class<?>[0]) or toArray (new Class<?>[list.size()]) is an interesting topic.

[hazendaz]

closing as same issue, the other way around in spotbugs to remove the older check was raised as likely how user seen this here. Processing power as noted, its better to be zero based and since java 6 written better. The direct size though does take away a small impact to garbage collection only but it does not seem to be worthwhile to matter given its empty to start with. So this PR is not worth applying.