The object of this code is to test a person's knowledge of whether they know Object Oriented Programming specifically inheritance.

           A
           |
           |
           B
          / \
         /   \
        C     D

1. B u = new C();
2. D v = (D)u;
3. C w = (C)u;
4. D x = (D)(new A());
5. A x = (A)(new D());
6. D y = new D();
7. C z = (C)y;