Controlling overridability of members in subclasses

We will code the VirtualDomesticCat abstract class and its concrete subclass: MaineCoon. Then, we will code the VirtualBird abstract class, its VirtualDomesticBird abstract subclass, and the Cockatiel concrete subclass. Finally, we will code the VirtualDomesticRabbit concrete class. While coding these classes, we will use Java 9 features that allow us to decide whether the subclasses can or cannot override specific members.

All the virtual domestic cats must be able to talk, and therefore, we will override the talk method inherited from VirtualDomesticMammal to print the word that represents a cat meowing: "Meow". We also want to provide a method to print "Meow" a specific number of times. Hence, at this point, we realize that we can take advantage of the printSoundInWords method we declared in the VirtualHorse class.

We cannot access this instance method in the VirtualDomesticCat abstract class because it doesn't inherit from VirtualHorse...