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

To add on a bit to @Esteban Araya's answer, they will both require the creation of a new string each time through the loop (as the return value of the some Assignment expression). Those strings need to be garbage collected either way.