gistfile1.java

    private <T> List<T> fromJson(String json, Class<T> clazz) {
        Gson gson = new Gson();
        Type absUserListType = new TypeToken<Collection<T>>() {
        }.getType();

        // convert the json string back to object
        List<T> objs = gson.fromJson(json, absUserListType);

        return objs;
    }