Declare an object inside or outside a loop?

Yuval Adam :

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.

Dave Markle :

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.

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edited at2020-07-15

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