public class Main1 {
    public static void main(String[] args){
        int kolvo = 0;
        double pi;
        int i = 0;
        while (kolvo < 1000) {
            Point point = new Point();
            point.random();
            if(point.checkInCircle()) {
                i ++;
            }
            pi = i / 1000 * 4;
            System.out.println("Число пи = " + pi);
            kolvo++;
        }
    }
}

class Point{
    private double x;
    private double y;

    public void random(){
        x = Math.random();
        y = Math.random();
    }

    public boolean checkInCircle() {
        if (this.x * this.x + this.y * this.y < 1) {
            return true;
        }else{
            return false;
        }
    }
}