MonteCarloPI - Java

public class Program {
    static double monteCarloPI(int n) {
        int pointsIn = 0;
        for (int i = 0; i < n; i++) {
            double x = Math.random();
            double y = Math.random();
            if (Math.sqrt(x*x + y*y) < 1.0) {
                pointsIn++;
            }
        }
        return 4.0 * (double)pointsIn / n; // PI
    }
    public static void main(String[] args) {
        System.out.println("PI = " + monteCarloPI(100));
        System.out.println("PI = " + monteCarloPI(1000));
        System.out.println("PI = " + monteCarloPI(10000));
        System.out.println("PI = " + monteCarloPI(10000000));
    }
}