如何在静态内部类中重用外部类的泛型？

Question

It is my understanding that the outer class' parameterized types are accessible to the inner class, possibly this isn't possible using a static inner class?

The below doesn't compile for me. I would like my static inner class to inherit its generic parameters from the wrapper class.

interface CarFactory<V, W> {
   W makeCar(V);
}

public abstract class Car<T, U> {

   ....

   public static class Factory implements CarFactory<T, U> {
    @Override
    public U makeCar(T model) {
      ...
    }
  }
}

Answer 1

From 8.1.2. Generic Classes and Type Parameters

It is a compile-time error to refer to a type parameter of a generic class C anywhere in:

• the declaration of a static member of C (§8.3.1.1, §8.4.3.2, §8.5.1), or

• t he declaration of a static member of any type declaration nested within C , or

• a static initializer of C (§8.7), or

• a static initializer of any class declaration nested within C.