Point intersection(Segment another) {
        double den = ((this.startX - this.endX) * (another.startY - another.endY) - (this.startY - this.endY) * (another.startX - another.endX)); //знаменатель
        double a = (this.startX * this.endY - this.startY * this.endX); //x1y2 - y1x2
        double b = (another.startX * another.endY - another.startY * another.endX); //x3y4 -y3x4
        double pointx = ((a * (another.startX - another.endX)) - b * (this.startX - this.endX)) / den; //X
        double pointy = ((a * (another.startY - another.endY)) - b * (this.startY - this.endY)) / den; //Y

        Point answer = new Point(pointx, pointy);
        //проверка
        boolean f1 = (((this.endX <= answer.getX()) && (answer.getX() <= this.startX)) || ((this.startX <= answer.getX()) && (answer.getX() <= this.endX)));
        boolean f2 = (((this.endY <= answer.getY()) && (answer.getY() <= this.startY)) || ((this.startY <= answer.getY()) && (answer.getY() <= this.endY)));
        boolean f3 = (((another.endX <= answer.getX()) && (answer.getX() <= another.startX)) || ((another.startX <= answer.getX()) && (answer.getX() <= another.endX)));
        boolean f4 = (((another.endY <= answer.getY()) && (answer.getY() <= another.startY)) || ((another.startY <= answer.getY()) && (answer.getY() <= another.endY)));

            if ((f1 && f2 && f3 && f4) != false && den != 0 &&  ) {
                return answer;
            }
//            if () {
//                throw new NullPointerException();
//            }

        else return null;


    }