code: public LinearRing getInteriorRingN(int n) {
  		if (!isEmpty()) {
  			if (interiorRings != null && interiorRings.length > n) {
  				return interiorRings[n];
  			}
  		}
  		return null;
  	}
docs: Get one of the interior LinearRing geometries. i.e. one of the holes.
  
  @param n
  Index in the geometry's interior rings.
  @return Returns the hole if it exists, null otherwise.