What is the best way to get the count/length/size of an iterator?

Question

Is there a \"computationally\" quick way to get the count of an iterator?

int i = 0;
for ( ; some_iterator.hasNext() ; ++i ) some_iterator.next();
         


        

Answer 1

Your code will give you an exception when you reach the end of the iterator. You could do:

int i = 0;
while(iterator.hasNext()) {
    i++;
    iterator.next();
}

If you had access to the underlying collection, you would be able to call coll.size()...

EDIT OK you have amended...