static Iphone11 LoadFromJsonFile(string fileName)
        {
            string   JsonString = File.ReadAllText(fileName);
            Iphone11 i          = JsonSerializer.Deserialize <Iphone11>(JsonString);

            Console.WriteLine("Object is deserilized");
            Console.WriteLine();
            return(i);
        }
        static void Main(string[] args)
        {
            Iphone11 i = new Iphone11();

            i.print();
            string JsonFileName = "IphoneAsJson.txt";

            SaveObjectAsJson(i, JsonFileName);

            Iphone11 i2 = LoadFromJsonFile(JsonFileName);

            i2.print();
        }