Implementing interface with inner interface

Question

I want to implement an interface which has inner interface. I have problem with overriding setter method. Here is draft of my problem:

Interfaces hierarchy:

public interface A {
    public interface B {}
    public void setBs(List<B> list);
}

Implementation:

public class AImpl implements A {
    private List<BImpl> listOfBs;
    public static class BImpl implements B {}
    @Override
    public void setBs(... list) { listOfBs = list }
}

What should be the type of setBs(... list) method's parameter? List<? extends B> doesn't override superclass's method.

Answer 1

As mentioned by fantarama, signature should be public void setBs(List<B> list).

If you're getting the error in your IDE or build framework, make sure your java compiler and target versions are set correctly.