public static <T> T json2Obj(String json, Class<T> cls) {

        Gson gson = new Gson();

        return gson.fromJson(json, cls);

    }

public static <T> List<T> json2ListObj(String json, Class<T> cls) {

        List reList = new ArrayList();

        JsonElement jsonElement = new JsonParser().parse(json);

        JsonArray array = jsonElement.getAsJsonArray();

        Iterator iterator = array.iterator();

        Gson gson = new Gson();

        while (iterator.hasNext()) {

            JsonElement json2 = (JsonElement) iterator.next();

            T contact = gson.fromJson(json2, cls);

            //can set some values in contact, if required

            reList.add(contact);

        }

        return reList;

    }

 gson.fromJson(json, new TypeToken<List<YourClass>>() {}.getType());