1  public class MonteCarloSimulation {
  2    public static void main(String[] args) {
  3      final int NUMBER_OF_TRIALS = 10000000;
  4      int numberOfHits = 0;
  5  
  6      for (int i = 0; i < NUMBER_OF_TRIALS; i++) {
  7        double x = Math.random() * 2.0 - 1;
  8        double y = Math.random() * 2.0  - 1;
  9        if (x * x + y * y <= 1)
 10          numberOfHits++;
 11      }
 12  
 13      double pi = 4.0 * numberOfHits / NUMBER_OF_TRIALS;
 14      System.out.println("PI is " + pi);
 15    }
 16  }