why is out is 15

Question

ArrayList<Integer> list = new ArrayList<Integer>();
for (int i = 0; i < 6; i++) {
list.add(i);
}
int x = 0;
Iterator<Integer> it = list.iterator();
while (it.hasNext()) {
x+= it.next();
}
System.out.println(x);

Answer 1

ABUBAKAR AHMED ALI , the first loop adds the following values in the arraylist => 0, 1, 2, 3, 4, 5. The second loop calculates the sum of this elements 0+1+2+3+4+5 => 15.