public Map<String, Object> selectDataNumRank(Map<String, Object> map) {
Map<String,Object> resultMap = new HashMap<>();
List<Map<String,Object>> list = policeStationCheckMapper.selectDataNumRank(map);
if(null == list || list.isEmpty()){
System.out.println("空的");
Map<String,Object> fMap = new HashMap<>();
fMap.put("num",0);
fMap.put("rank",0);
list.add(fMap);
}
resultMap.put("list",list);
resultMap.put("status",200);
return resultMap;
}
两段判断为空,list不存在或者无内容
null==list,null要在前,不然空指针异常