Even Iterator

Implements an iterator only output the even number.

Example

public class EvenIterator implements Iterator<Integer> {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<Integer>();
        list.add(1); list.add(4); list.add(3); list.add(5);
        list.add(6); list.add(7); list.add(9); list.add(2);
        EvenIterator it = new EvenIterator(list.listIterator());
        while(it.hasNext()){
            System.out.println(it.next());
        }
    }
}

Output

4
6
2

Solution

public class EvenIterator implements Iterator<Integer> {

    Iterator<Integer> iterator;

    public EvenIterator(Iterator<Integer> iterator) {
        this.iterator = iterator;
    }

    @Override
    public boolean hasNext() {
        return iterator.hasNext();
    }

    @Override
    public Integer next() {
        int res = 0;
        while (iterator.hasNext() && (res = iterator.next()) % 2 != 0)
            ;
        return res;
    }


    public static void main(String[] args) {
        List<Integer> list = new ArrayList<Integer>();
        list.add(1); list.add(4);
        list.add(3); list.add(5);
        list.add(6); list.add(7);
        list.add(9); list.add(2);
        EvenIterator it = new EvenIterator(list.listIterator());
        while(it.hasNext()){
            System.out.println(it.next());
        }
    }
}