如何在java pojo中处理来自graphql模式的接口

public interface CarInterface {
    String getBrand();
}

public class Car implements CarInterface {
    private String brand;

    @Override
    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }
}

public class GraphQLQueryResolver {
    public CarInterface getCar() {
        Car car = new Car();
        car.setBrand("Tesla");
        return car;
    }
}

public class Main {
    public static void main(String[] args) {
        // 解析GraphQL查询
        String query = "{ car { brand } }";
        ExecutionResult result = graphQL.execute(query);

        // 获取查询结果
        Map<String, Object> data = result.getData();
        CarInterface car = (CarInterface) data.get("car");

        // 调用POJO方法
        String brand = car.getBrand();

        // 构建响应
        Map<String, Object> response = new HashMap<>();
        response.put("brand", brand);

        // 返回响应给客户端
        return response;
    }
}