public class EvenOdd {

    public static void main(String[] args) {

        int num = 7;

        if (num % 2 == 0)

            System.out.println(num + " is Even");

        else

            System.out.println(num + " is Odd");

    }

}

num stores the number to check.

% (modulus) finds the remainder when dividing by 2.

If remainder = 0 → number is even, otherwise odd.