approxPiCalc.java

import java.util.Random;

public class Main {
    public static void main(String[] args) {
        for(var a = 0; a < 100; a++) {
            int count = 0;
            for (var i = 0; i < 20000; i++) {
                var x = new Random().doubles(0, 2).findFirst().getAsDouble();
                var y = new Random().doubles(0, 2).findFirst().getAsDouble();

                if ((x - 1) * (x - 1) + (y - 1) * (y - 1) <= 1) {
                    count++;
                }
            }

            System.out.println("Approx PI value: " + 4 * count / (double)20000);
        }
    }
}