How would this code (shown below), output 15?

Question

What is the output of this code?
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);

how does x=15 in the end??

Answer 1

First loop adds numbers 0-5 to a list.
Next itterates through each element in the list, adding them together.

0+1+2+3+4+5 = 15