Page 681 - AP Computer Science A, 7th edition
P. 681
22. (E) Method call I fails because ClassOne does not have access to the methods of its subclass. Method call II fails because c2 needs to be cast to ClassTwo to be able to access methodTwo. Thus, the following would be OK:
((ClassTwo) c2).methodTwo();
Method call III works because ClassTwo inherits methodOne from its superclass, ClassOne.
