Gson を使用してカスタム JSON タイムスタンプを効率的に逆シリアル化する方法

@Override
public User deserialize(JsonElement json, Type type, JsonDeserializationContext context) throws JsonParseException {
    return new User(
            json.getAsJsonPrimitive().getAsInt(),
            json.getAsString(),
            json.getAsInt(),
            (Timestamp)context.deserialize(json.getAsJsonPrimitive(), Timestamp.class));
}

// User class remains unchanged

// TimestampDeserializer class
class TimestampDeserializer implements JsonDeserializer<Timestamp> {
    @Override
    public Timestamp deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        long time = Long.parseLong(json.getAsString());
        return new Timestamp(time);
    }
}

class Foo {
    public static void main(String[] args) {
        Gson gson = new GsonBuilder()
                .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
                .registerTypeAdapter(Timestamp.class, new TimestampDeserializer())
                .create();

        // Construct sample JSON data with corrected "update_date" field
        String jsonInput = "...";

        User[] users = gson.fromJson(jsonInput, User[].class);
        for (User user : users) {
            System.out.println(user);
        }
    }
}