Enforcing return type for an class that implements an interface

Question

How do I enforce that the method getFoo() in the implementing class, returns a list of the type of same implementing class.

public interface Bar{
     ....
          


        

Answer 1

Maybe sth like this

public interface Bar {
     ....
     List getFoo(); 
}

public class T implements Bar {
     List getFoo();
}

public class TestClass extends T {};