Question

Is there any performance penalty for the following code snippet?

for (int i=0; i<someValue; i++) {     Object o = someList.get(i);     o.doSomething; } 

Or does this code actually make more sense?

Object o; for (int i=0; i<someValue; i++) {     o = someList.get(i);     o.doSomething; } 

If in byte code these two are totally equivalent then obviously the first method looks better in terms of style, but I want to make sure this is the case.

Answer 1

In today’s compilers, no. I declare objects in the smallest scope I can, because it’s a lot more readable for the next guy.