Infinite loop while using iterator

Question

Set key1 = map.keySet();
Iterator it1 = key1.iterator();
int cnt=0;
while (it1.hasNext()) {
  cnt++;
}

What are the chances that this code will result

Answer 1

Actually it is resulting in infinite loop. My doubt is it is because I am not taking it1.next(); , is it true?

Yes, this is true.

However, you can find the count of a collection much easier:

int cnt = map.size();