calculate pi in java

1    private static double calcPi(final int iterations){
2        double x;
3        double y;
4        int successCount = 0;
5        for (int i = 0; i <= iterations; i++){
6            x = Math.random();
7            y = Math.random();
8            if ((Math.pow(x, 2) + Math.pow(y, 2)) <= 1){
9                successCount++;
10            }
11        }
12	    return (double) (4 * successCount) / iterations;
13    }