List對其中的map按規則排序

public List<Map<String, Object>> getBreedRecordList(Batch batchBean) {
        List<Map<String, Object>> fieldList = null;
        Map<String, Object> fieldMap = null;
        if (null != batchBean.getBreedRecordList() && batchBean.getBreedRecordList().size() > 0) {
            fieldList = Lists.newArrayList();
            for (BreedRecord fieldBean : batchBean.getBreedRecordList()) {
                fieldMap = Maps.newHashMap();
                fieldMap.put("id", fieldBean.getId());
                fieldMap.put("batchId", fieldBean.getBatch().getId());
                fieldMap.put("batchNo", fieldBean.getBatch().getBatchNo());
                fieldMap.put("type", DictUtils.getDictLabel(fieldBean.getType(), Constant.BREED_TYPE, fieldBean.getType()));
                fieldMap.put("item", fieldBean.getItem());
                fieldMap.put("itemNote", fieldBean.getItemNote());
                fieldMap.put("weather", fieldBean.getWeather());
                fieldMap.put("operator", fieldBean.getOperator());
                fieldMap.put("imageSrc", fieldBean.getImageSrc());
                fieldMap.put("delFlag", fieldBean.getDelFlag());
                fieldMap.put("remarks", fieldBean.getRemarks());
                fieldMap.put("recordDate", DateUtil.getDateStrByDate(fieldBean.getRecordDate()));
                fieldMap.put("updateDate", DateUtil.getDateTimeStrByDate(fieldBean.getUpdateDate()));
                fieldList.add(fieldMap);
                Collections.sort(fieldList, new Comparator<Map<String, Object>>() {

                    @Override
                    public int compare(Map<String, Object> o1, Map<String, Object> o2) {
                        // TODO Auto-generated method stub
                        String updateDate1 = (String) o1.get("recordDate");
                        String updateDate2 = (String) o2.get("recordDate");
                        return updateDate2.compareTo(updateDate1);
                    }
                });
            }
        }
        return fieldList;

默認爲升序，將。return arg0.getOrder().compareTo(arg1.getOrder()); 改爲：
return arg1.getOrder().compareTo(arg0.getOrder());
就成降序的了。