Which loop has better performance? Why?

Question

String s = \"\";
for(i=0;i<....){
    s = some Assignment;
}

or

for(i=0;i<..){
    String s = some Assignment;
}

Answer 1

It seems to me that we need more specification of the problem.

The

s = some Assignment;

is not specified as to what kind of assignment this is. If the assignment is

s = "" + i + "";

then a new sting needs to be allocated.

but if it is

s = some Constant;

s will merely point to the constants memory location, and thus the first version would be more memory efficient.

Seems i little silly to worry about to much optimization of a for loop for an interpreted lang IMHO.