Iterate with for loop or while loop?

Question

I often see code like:

Iterator i = list.iterator();
while(i.hasNext()) {
    ...
}

but I write that (when Java 1.5 isn\'t available or for

Answer 1

Using for loop you can work with a single variable, as it sets the scope of variable for a current working for loop only. However this is not possible in while loop. For Example:
int i; for(i=0; in1;i++) do something..

for(i=0;i n2;i+=2) do something.

So after 1st loop i=n1-1 at the end. But while using second loop you can set i again to 0. However

int i=0;

while(i less than limit) { do something ..; i++; }

Hence i is set to limit-1 at the end. So you cant use same i in another while loop.