程式碼：

     roadBeanArrayList.sort(new Comparator<RoadBean>() {

                                        //按照道路id進行升序排序
                                        @Override
                                        public int compare(RoadBean o1, RoadBean o2) {
                                            if
 
(o1.getRoadId()<o2.getRoadId()){

                                                return -1;
                                            }else {

                                                return 1;
                                            }


                                        }
                                    });