public class EnumTest7 {
    public enum Num {ONE, TWO, THREE, FOUR;
        public Num increment() {
            int next = ordinal() + 1;
            return values()[next];
        }
    }

    public static void main(String[] args) {
        for (Num num = Num.ONE; num.compareTo(Num.FOUR) < 0; num = num.increment()) {
            System.out.println("Num is " + num);
        }
    }
}