public class Line {
    private final Point start = new Point();
    private final Point end = new Point();


    public double getLength() {
        double length = end.getY() - start.getX();
        return length;
    }

    @Override
    public String toString() {
        return "Line{" +
                "start=" + start +
                ", end=" + end +
                '}';
    }
}