/**
* Returns true if the given object is an instance of PointSet2D that contains the same number of
* points, such that iteration on each set returns equal points.
*/
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (!(obj instanceof PointSet2D)) return false;
PointSet2D set = (PointSet2D) obj;
if (this.points.size() != set.size()) return false;
Iterator<Point2D> iter = set.iterator();
for (Point2D point : points) {
if (!point.equals(iter.next())) return false;
}
return true;
}
