Array Sum Activity in Java

//here is an Array Sum sample Activity in Java
public class ArraySum {

       public static void main(String[] args) {
               int[] val = {0, 1, 2, 3};
        int sum = 0;
        sum = val[0] + val[1] + val[2] + val[3];
        System.out.println("Sum of all numbers = " + sum);
    }
}