无法选择参数化类型 [英] cannot select Parameterized Type

问题描述

我想创建一个休息区以在服务器和客户端之间进行通信.

I want to create a rest to communicate between server and client.

以下给出的构造函数:

public class RestHelper<I, R> {
    public RestHelper(String url, I input, Class<R> output){
        ResponseEntity<R> responseEntity = restTemplate.exchange(url, HttpMethod.POST, requestEntity, output );
    }
}

对于普通类型，我可以这样做:

For normal type, I can do:

RestHelper<User, Result> helper = new RestHelper<>(url, user, Result.class);

如何传递通用类型，例如:

How can I pass a generic type, like:

ResultContainData<Boolean>

下面的代码不起作用:

    ResultContainData<Boolean> result = new ResultContainData<>();
    RestHelper<User, ResultContainData<Boolean>> helper = new RestHelper<>(url, user, (Class<ResultContainData<Boolean>>) ((ParameterizedType) result.getClass().getGenericSuperclass()).getActualTypeArguments()[0]);

我遇到了运行时错误:无法转换为ParameterizedType.

I got a runtime error: cannot cast to ParameterizedType.

推荐答案

我找到了解决方案.

ResultContainData<Boolean> result = new ResultContainData<>();
RestHelper<User, ResultContainData<Boolean>> helper = new RestHelper<>(url, user, (Class<ResultContainData<Boolean>>)result.getClass());

它正在为我工​​作.我仍在寻找更好的解决方案.

It's working for me. I am still looking for a better solution.

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