我尝试在rest api中循环我的模型 用于获取对象（harga）

 List<RingkasanOrderModel>ringkasanOrderModelList;
            Gson g;
            g = new Gson();

 ringkasanOrderModelList = g.fromJson(new String(responseBody),new 
 TypeToken<List<RingkasanOrderModel>>(){}.getType());
 for (RingkasanOrderModel ringkasanOrderModel in ringksanOrderModelList ){
                double harga = ringkasanOrderModel.harga;
                total += harga;
                ppn = harga * 0.1;
               grandtotal = total + ppn;
            }