Define a class to accept a number and check if the sum of the first digit and the last digit is an even number or an odd number .

            N = 2396    N = 9316
First digit:   2         9
Last digit:    6         6
Sum:           8         15
Output: Sum is even  Sum is odd

import java.util.Scanner;

public class FirstLastSum {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int n = sc.nextInt();

        int lastDigit = n % 10;
        int firstDigit = n;
        while (firstDigit >= 10) {
            firstDigit /= 10;
        }

        int sum = firstDigit + lastDigit;

        System.out.println("First digit: " + firstDigit);
        System.out.println("Last digit: " + lastDigit);
        System.out.println("Sum: " + sum);

        if (sum % 2 == 0)
            System.out.println("Sum is even");
        else
            System.out.println("Sum is odd");
    }
}