Methods

import java.util.Scanner;

public class Methods {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        System.out.println("Choose an option from below then enter in number format. ~^_^~");


        System.out.println("1. Factorial");
        System.out.println("2. Sum of Digits");
        System.out.println("3. All Digits Odd");
        System.out.println("4. Average Digit in An Integer");
        System.out.println("5. Midpoint of Three Integers");

        int menuChoice = scan.nextInt();

        System.out.println("Enter an integer.");
            int myInt = scan.nextInt();

        switch (menuChoice) {
            case 1:
                System.out.println(factorial(myInt));
                break;
            case 2:
                System.out.println(sumOfDigits(myInt));
                break;
            case 3:
                System.out.println("something here");
                break;
            case 4:
                System.out.println("something here again");
                break;
            default:
                System.out.println("Choose only between 1 -4.");
                break;
        }
    }

    public static int factorial(int n) {

        int factorial = 1;
        if (n >= 0) {
            for (int i = 1; i <= n; i++) {
                factorial *= i;
            }
        }
        return factorial;
    }

    public static int sumOfDigits(int n) {
        int sum = 0;

        while (n != 0) {
            sum = sum + n % 10;
            n = n / 10;
        }

        return sum;
    }


}