n个List合并，Map中某属性值相等的value值相加

 

List<Map> maps1 =[{"bigtypes":100,"num":400},{"bigtypes":200,"num":300},{"bigtypes":400,"num":500},{"bigtypes":600,"num":500}]



List<Map> maps2 =[{"bigtypes":400,"num":720},{"bigtypes":500,"num":320},{"bigtypes":200,"num":120}]





List<Map> maps3 =[{"bigtypes":700,"num":120},{"bigtypes":500,"num":320},{"bigtypes":100,"num":510}]

目的为将  bigtypes 属性值相等 num属性值进行相加，bigtypes属性值不相等的List<Map>累加

将json数组循环赋值给  foodIntakeType

            List<TDiet> tDiets = dietApiService.getDietsByDate(userId, startDate, endDate);

            List<Map<String, String>> list = new ArrayList();

            List<Map<String, String>> newList = new ArrayList();

            int talls=0;

            if(tDiets.size()>0){

                int a=0;

                for(TDiet td:tDiets){

                    talls+=Integer.parseInt(td.getFoodIntakeMeasure());//摄入总量

                    a++;

                    String foodIntakeType =td.getFoodIntakeType();

                    org.json.JSONArray jsonArray = new org.json.JSONArray(foodIntakeType);

                    int iSize = jsonArray.length();

                    for (int i = 0; i < iSize; i++) {

                        org.json.JSONObject jsonObj = jsonArray.getJSONObject(i);

                        String bigtypes = jsonObj.get("bigtypes").toString();

                        String num = jsonObj.get("num").toString();

                        Map<String, String> maMap = new HashMap<String, String>();

                        maMap.put("bigtypes", bigtypes);

                        maMap.put("num", num);                        

                        if(a>1){//多组数据

                            newList=list;

                            Map<String,String> newMap =new HashMap<String, String>();

                            int b=0;

                            for (int j = 0; j < list.size(); j++) {

                                newMap= list.get(j);

                                if(bigtypes.equals(newMap.get("bigtypes").toString())){//key值相等的：value相加

                                    b++;

                                    newList.remove(j);

                                    Map<String, String> maMap2 = new HashMap<String, String>();

                                    maMap2.put("bigtypes", bigtypes);

                                    int xx= Integer.parseInt(newMap.get("num"))+Integer.parseInt(num);

                                    maMap2.put("num",xx+"" );

                                    newList.add(maMap2);

                                    break;

                                }

                            }

                            if(b==0){//key值与list<map>的map无共同key的：list新增

                                newList.add(maMap);    

                            }

                            list= newList;

                        }else{//只有一组数据

                            list.add(maMap);

                        }

                    }



                }

                //取百分比

                newList=new ArrayList();

                for (int c = 0; c < list.size(); c++) {

                    Map<String,String> newMap2 =new HashMap<String, String>();

                    Map<String,String> oldmap=new HashMap<String, String>();

                    oldmap = list.get(c);

                    newMap2.put("bigtypes", oldmap.get("bigtypes"));

                    int aa= Integer.parseInt(oldmap.get("num"));

                    newMap2.put("num",towNumDivide(aa,talls)+"%");

                    newList.add(newMap2);

                }

                list=newList;

            }