class Segment {
  Point début;
  Point fin;
  public String toString() {
    return début + " -> " + fin;
  }
  Segment() {}
  Segment(int dx, int dy, int fx, int fy) {
    début = new Point(dx, dy);
    fin = new Point(fx, fy);
  }
  Segment(Point d, Point f) {
    début = d;
    fin = f;
  }
}

class TestSegment {
  public static void main(String[] args) {
    Segment s = new Segment(3, 4, 7, 8);
    Segment t = new Segment();
    System.out.println(t);
    Point d = new Point(1,1);
    Point f = new Point(3,3);
    Segment r = new Segment(d,f);
    System.out.println(r);
    d.déplace(1,2);
    System.out.println(r);
  }

}