根据list<Object>中的某个字段排序

compareTo必须是两个对象之间的比较

private void businessSort(List<WxDailyBusinessInfo> wxDailyBusinessInfo) {
　　　　　　//排序前
        for (int i = 0; i < wxDailyBusinessInfo.size(); i++) {
            System.out.println(new Gson().toJson(wxDailyBusinessInfo.get(i)));
            System.out.println("---------------");
        }
        Collections.sort(wxDailyBusinessInfo,
                new Comparator<WxDailyBusinessInfo>() {
                    @Override
                    public int compare(WxDailyBusinessInfo o1,
                            WxDailyBusinessInfo o2) {
                        return o1.getDistance().compareTo(o2.getDistance());
                    }
                });
        System.out.println("***************排序后************");
        for (int i = 0; i < wxDailyBusinessInfo.size(); i++) {
            System.out.println(new Gson().toJson(wxDailyBusinessInfo.get(i)));
            System.out.println("---------------");
        }
    }