code: public int getNumPoints() {
  		if (isEmpty()) {
  			return 0;
  		}
  		int total = exteriorRing.getNumPoints();
  		if (interiorRings != null) {
  			for (LinearRing interiorRing : interiorRings) {
  				total += interiorRing.getNumPoints();
  			}
  		}
  		return total;
  	}
docs: Return the sum of all points in the exterior ring + the total number of points in all the interior rings.