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

If you want to speed up for loops, I prefer declaring a max variable next to the counter so that no repeated lookups for the condidtion are needed:

instead of

for (int i = 0; i < array.length; i++) {
  Object next = array[i];
}

I prefer

for (int i = 0, max = array.lenth; i < max; i++) {
  Object next = array[i];
}

Any other things that should be considered have already been mentioned, so just my two cents (see ericksons post)

Greetz, GHad