Abstract Classes
Abstract classes provide another way to enforce structure in your classes. An abstract class is never directly instantiated. Its purpose is to provide function implementations through inheritance to subclasses that are instantiated.
An abstract class is defined by prepending the abstract keyword to a class definition.
In addition to function implementations, abstract classes can include abstract functions – function declarations without implementations.
It is time to give the player something to fight in NyetHack. Add an abstract class called Monster to Creature.kt. Monster implements the Fightable interface, and therefore needs name and healthPoints properties and a takeDamage function. (What about the other ...
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