Enum State Machine

Lab Java Advanced 30 points

Create enum Light { RED, GREEN, YELLOW } with a method next() using a switch (RED→GREEN→YELLOW→RED). Read a starting light and a number of steps; print each state as it changes, then its ordinal().

Input

Line 1: light name. Line 2: steps.

Output

One name per step, then the final ordinal.

Example

Input

RED
4

Output

GREEN
YELLOW
RED
GREEN
1

Sample input available Sample output available

Editor

Java

Hints

Light.valueOf("RED") converts text to the constant.

Inside a switch on an enum, write case RED, not case Light.RED.

Solution explanation

Enums make invalid states impossible - you can't have a light called PURPLE.

Show solution

import java.util.Scanner;

enum Light {
    RED, GREEN, YELLOW;

    Light next() {
        switch (this) {
            case RED:
                return GREEN;
            case GREEN:
                return YELLOW;
            default:
                return RED;
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Light light = Light.valueOf(sc.next());
        int steps = sc.nextInt();
        for (int i = 0; i < steps; i++) {
            light = light.next();
            System.out.println(light);
        }
        System.out.println(light.ordinal());
    }
}

Output

Answer