Flexible return type of method

Question

I have a couple of classes (extending AsyncTaskLoader) that all basically do the same thing: make a REST call and create POJOs from the response with Gson. Now I thought it would be more elegant to have just one class (let it take some parameters) and just tell it what kind of object I expect to get back. As a parameter I would give the class of the POJO that I expect to get back because it is used in the Gson deserialization like

Imprint impr = gson.fromJson(responseString, Imprint.class);

What would be the return type of the class / method? I thought about letting it return java.lang.Object and then downcast it to the POJO type object that I expect, but is there a better possibility?

Answer 1

Use generics. An example method signature could look like

public <T> T callService(String parameters, Class<T> clazz)

Answer 2

你可以使用uwe解决方案，或者只返回泛型类（这里是asynctask），然后做一个强制转换，甚至返回Object，然后做一个强制转换（更危险）