List排序、集合排序

    menuList.sort(Comparator.comparingInt(MenuPO::getSort));

                Collections.sort(menuList, new Comparator<MenuPO>() {
                    @Override
                    public int compare(MenuPO o1, MenuPO o2) {
                        return o1.getSort()-o2.getSort();
                    }
                });

   翻转
Collections.reverse(list);