import java.util.Iterator;

public class EnumTest10 {
    private enum Num implements Iterable {ONE, TWO, THREE, FOUR;
        public Iterator iterator() {
            return new Iterator<Num>() {
                private int position = 0;

                public boolean hasNext() {
                    return position < Num.values().length;
                }

                public Num next() {
                    Num num =  Num.values()[position];
                    position++;
                    
                    return num;
                }

                public void remove() {
                    throw new UnsupportedOperationException();
                }
            };
        }
    }

    public static void main(String[] args) {
        Num num = Num.ONE;
        Iterator it = num.iterator();

        while (it.hasNext()) {
            System.out.println(it.next());
        }
    }
}