VarArgs

 public class varArgs {

    static int sum(int... arr) {

        int sum = 0;

        for (int a : arr) {

            sum += a;

        }

        return sum;

    }

    public static void main(String[] args) {

        System.out.println("Sum:" + sum());

        System.out.println("Sum:" + sum(1));

        System.out.println("Sum:" + sum(5, 9));

        System.out.println("Sum:" + sum(10, 13, 15));

        System.out.println("sum:" + sum(51, 17, 19, 95));

        System.out.println("sum:" + sum(121, 34, 56, 67, 78, 90));

    }

}

                                         BY DECLARING ANOTHER ARGUMENT

public class varArgs2 {

    public static int sum(int a, int... arr) {

        int sum = a;

        for (int x : arr) {

            sum += a;

        }

        return sum;

    }

    public static void main(String[] args) {

        System.out.println("sum:" + sum(1));

        System.out.println("sum:" + sum(1, 1, 3, 4));

        System.out.println("sum:" + sum(10, 34, 56, 78));

        System.out.println("sum:" + sum(41, 78, 47, 11, 8));

        System.out.println("sum:" + sum(18, 9, 15, 63, 78, 14));

    }

}