计算面积

/** * 计算面积 *  * @param vec * @return */public static Vector getArea(Vector vec) {Vector result = new Vector();ArrayList al = null;if (vec != null && vec.size() > 0) {Iterator it = vec.iterator();while (it.hasNext()) {ArrayList list = (ArrayList) it.next();double l = Double.parseDouble(list.get(0).toString());double m = Double.parseDouble(list.get(1).toString());double x = Double.parseDouble(list.get(2).toString());double y = Double.parseDouble(list.get(3).toString());double r = Double.parseDouble(list.get(4).toString());if (x > l || y > m) {break;} else {double area = Math.PI * r * r;al = new ArrayList();al.add(x);al.add(y);al.add(area);if (!result.contains(al)) {result.add(al);}}}}return result;}