Riemann Sums

public class Riemann_Sum_Calculator {
    public static double riemannSum(double n, double a, double b) {
        double deltaX = (b - a)/n,
               sum = 0;
        for(int i = 1; i <= n; i++) {
            sum += (25 - Math.pow((a + i*deltaX), 2))*deltaX;
        }
        return sum;
    }

    public static void printSum(double sum) {
        System.out.println("The Riemann sum is: " + sum);
    }

    public static void main(String [] args) {
        double sum;

        sum = riemannSum(10, -5, 5);
        printSum(sum);

        sum = riemannSum(30, -5, 5);
        printSum(sum);

        sum = riemannSum(60, -5, 5);
        printSum(sum);

        sum = riemannSum(80, -5, 5);
        printSum(sum);
    }
}