Calculate Sum of all numbers from Array

package programs;

public class CalculateSumOfNumbersOfArray {

public int calculateSumOfNumbers(){
int[] a = {10,20,30,40};
int sum = 0;
for(int arr:a){
sum = sum + arr;
}
return sum;
}

public static void main(String[] args) {
CalculateSumOfNumbersOfArray obj = new CalculateSumOfNumbersOfArray();
System.out.println(obj.calculateSumOfNumbers());
}

}