Question

How do I return a custom object which uses generic as an empty list?

I have extended the List interface and created my own custom type

public interface MyCustomList<T>
  extends List<T>
{

In a class, I have a method which returns a custom list but I always end up with a compiler error. Basically the default implementation of this method should return an empty list but I cant get it to work since I am encountering below error.
‘incompatible types’

public MyCustomList<MyCustomBean> getCodes(String code)
{
    return  Collections.<MyCustomList<MyCustomBean>>emptyList();
}

Whats the proper way of sending back a ‘generified’ empty list implementation?

Answer 1

Anything wrong with a perfunctory impl?

class MyCustomListImpl<T> extends ArrayList<T> implements MyCustomList<T> {}

return new MyCustomListImpl<MyCustomBean>();