Leetcode #281. Zigzag Iterator

[yokostan]

Using iterator, actually I don't quite get it, plus it's less frequent problem, let's review it briefly.

public class ZigzagIterator {
    Queue<Iterator<Integer>> queue;

    public ZigzagIterator(List<Integer> v1, List<Integer> v2) {
        queue = new LinkedList<Iterator<Integer>>();
        if (v1.iterator().hasNext()) queue.offer(v1.iterator());
        if (v2.iterator().hasNext()) queue.offer(v2.iterator());
    }

    public int next() {
        Iterator<Integer> next = queue.poll();
        int result = next.next();
        if (next.hasNext()) queue.offer(next);
        return result;
    }

    public boolean hasNext() {
        return !queue.isEmpty();
    }
}
/**
 * Your ZigzagIterator object will be instantiated and called as such:
 * ZigzagIterator i = new ZigzagIterator(v1, v2);
 * while (i.hasNext()) v[f()] = i.next();
 */