获取继承的泛型方法的返回类型 [英] Get the return Type for inherited generic method

问题描述

我有这3个班级

public class Box<O> {

    public O getItem() {...}

}

public class CoolBox extends Box<Integer> { ... }

public class AmazingBox extends CoolBox { ... }

在代码的某一时刻，我需要获取AmazingBox类的方法getItem()的返回类型，但是当通过反射访问其方法时，我将Object作为返回类型而不是Integer.

At one point in my code, I need to get the return Type of the method getItem() for the AmazingBox class, but when accessing its methods via reflection, I get Object as the return Type instead of Integer.

有什么方法(纯Java或其他库)获取Integer作为返回类型?

Is there any way, (plain java or extra libraries) to get Integer as the return Type?

这是我用来获取返回类型的代码:

This is the code I used to get the return type:

Class<?> c = AmazingBox.class;  // This is not how i get the class but its for demonstration purposes

Method m = c.getMethod("getItem");

Type t = m.getReturnType();

推荐答案

我刚刚发现有一个名为

I just discovered that there is a library called GenericsResolver that does exactly what I want.

使用这段代码可以返回正确的类型

Using this piece of code it returns the correct type

Class<?> clazz = AmazingBox.class;
GenericsContext genericsContext = GenericsResolver.resolve(clazz);
Method method = clazz.getMethod("getItem");
Type methodReturnType = genericsContext.method(method).resolveReturnType();

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