n个List<Map>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;
            }