How do you cast a List of supertypes to a List of subtypes?

Question

For example, lets say you have two classes:

public class TestA {}
public class TestB extends TestA{}

I have a method that returns a L

Answer 1

casting of generics is not possible, but if you define the list in another way it is possible to store TestB in it:

List myList = new ArrayList();

You still have type checking to do when you are using the objects in the list.