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

The problem is, that you don't call it1.next() in the loop, so it1.hasNext() is always true. In other words, you never move to the next item.

BTW, you don't need iterator for what you want to archieve, try

int cnt=map.size();