Map<String, Object> res = new HashMap<String, Object>(); for (Map<String, Object> map : list) { String id = map.get("id").toString(); String value = map.get("value").toString(); if (res.containsKey(id)) { String oldVal = res.get(id).toString(); value = oldVal + ","...
Map<String,Object> h1 = new HashMap<>(); h1.put("12","fdsa"); h1.put("123","fdsa"); h1.put("124","fdsa"); h1.put("125","fdsa"); Map<String,Object> h2 = new HashMap<>(); h2.put("h12","fdsa"); h2.put("h123","fdsa"); h2.put("h124","fdsa"); h2.put("...
遍历<List<Map<String,Object>>>数据结构的两种方法 packagecom.test;importjava.util.ArrayList;importjava.util.HashMap;importjava.util.List;importjava.util.Map;importjava.util.Map.Entry;publicclassPrintList {publicstaticvoidmain(String[] args) { List<Map<String,Object>> list =newArrayList(); Map<S...
Map<String,Object> map = new HashMap<>(); map.put("name","张三1号"); map.put("age",1);; list.add(map); List<Map<String, Object>> res = list.stream().distinct().collect(Collectors.toList()); 1. 2. 3. 4. 5. map(映射,重构。对原集合的元素进行操作,生成一个新集合):...
java中string类型转换成map 背景:有时候string类型的数据取出来是个很标准的key、value形式,通过Gson的可以直接转成map 使用方式: Gson gson =newGson(); Map<String, Object> map =newHashMap<String, Object>(); map=gson.fromJson(jsonString, map.getClass());#关键...
public User selectByMap(Map<String,Object> map); 映射文件UserMapper.xml中增加 <select id="selectByMap" resultType="com.zssj.domain.User"> select * from user where id = #{id} and username = #{username} and password = #{password} ...
Map<String, Object> resMap = new HashMap<String, Object>(); Iterator<Entry<String, Object>> it = jsonObject.entrySet().iterator(); while (it.hasNext()) { Map.Entry<String, Object> param = (Map.Entry<String, Object>) it.next(); ...
Map res=newHashMap();//用来盛放解析的map Set<Map.Entry<String,Object>> entrySet=obj.entrySet(); for(Map.Entry<String,Object> e:entrySet){ String key=e.getKey().toString(); Object value= e.getValue(); if(valueinstanceofList){
publicstaticvoidmap2Json(){Map<String,Object>map=newHashMap<>();map.put("code",401);map.put("data","fail");map.put("message","账号已在别处登录,请重新登陆");System.out.println("map :"+"\n"+map);//map转换为JSONJSONObject jsonObject=newJSONObject(map);System.out.println("map to...
2.mapper.java中,map的value泛型为Object @Repositorypublic interfaceTAppoinTmentMapperextendsBaseMapper<TAppoinTment>{List<HashMap<String,Object>>selectappointTms(QueryAppointmentListReq req);} 3.在java类中,转换成map代码如 List<HashMap<String,Object>>hashMapList=mapper.selectappointTms(req);HashMap<Strin...