public class Point2Testbed {
  public static void main(String[] argv) {
    Point2 pt1 = new Point2(), pt2 = new Point2(100), pt3 = new Point2(40, 80);
    System.out.println("pt1:");
    pt1.print();
    System.out.println("pt2:");
    pt2.print();
    System.out.println("pt3:");
    pt3.print();
  }
}