Compare inheritance and composition, the two fundamental ways to relate Java classes, then practice debugging ClassCastExceptions in Java inheritance.

Because you can extend at most one other class (recall from Part 1 that Java doesn’t support class-based multiple inheritance), you’re not forced to explicitly extend Object; otherwise, you ...

It's not good enough to simply use inheritance and apply the rules of polymorphism to your code. To write SOLID code, and properly implement the Liskov substitution principle in Java, your code must ...