Java 中的 Generics 出现问题

Question

I am using RestAssured framework for api calls and I want to create a method that will return give me value from the JSON response in the specific variable type.
I want to use generic return type but I don't like me implementation.
The RestAssured getList() returns a list of values according to JSON path and cast to value type. When I implement the getList() method, I have to cast the result to T in order to comply to the return value type:

public <T> T getValuesFromResponse(Response response, ValueTypeEnum value) {
    T t = null;
    switch (value) {
        case ID:
            //Will return List<Integer>
            t = (T) response.thenReturn().jsonPath().getList("data.id", Integer.class);
            break;
        case NAME:
            //Will return List<String>
            t = (T) response.thenReturn().jsonPath().getList("data.name", String.class);
            break;
    }
    return t;
}

When I want to call this method, I have to cast the values again to the type I need, ie:

((List<Integer>) getValuesFromResponse(response, ValueTypeEnum.ID)).get(0)

How do I avoid the double casting?
Is my implementation correct for using generic List<T> return type?

Answer 1

What do you think about using a method like this:

 public <T> List<T> getValuesFromResponse(Response response, String key, Class <T> clazz) {
    return response.thenReturn().jsonPath().getList(key, clazz);
}

... and then call it as:

List<Integer> listOfIds = getValuesFromResponse (response, "data.id", Integer.class);
List<String> listOfNames = getValuesFromResponse (response, "data.name", String.class);

I have't tried it to compile with the real 'Response' class, but I think this should work. Please let me know.