public class IntersectionIterator implements Iterator<Integer> {
    public IntersectionIterator(Iterator<Integer> it1, Iterator<Integer> it2) {
    }

	 /**
     * Returns the next element in the iteration (common element in the two iterators).
     */
    public boolean hasNext() {
    }

    /**
     * Returns true if the iteration has more elements (common elements in the two interators).
     */
    public Integer next() {
    }
}

IntersectionIterator it = new IntersectionIterator([1, 2, 4, 5, 6], [1, 3, 5]);
it.hasNext(); // true
it.next(); // 1
it.next(); // 5
it.hasNext(); // false
it.next(); // error

IntersectionIterator it = new IntersectionIterator([1, 2, 4, 5, 6], [3, 7, 8, 9]);
it.hasNext(); // false

IntersectionIterator it = new IntersectionIterator([1, 2, 3, 4], [1, 2, 3, 4]);
it.hasNext(); // true
it.next(); // 1
it.next(); // 2
it.next(); // 3
it.next(); // 4
it.hasNext(); // false