Monsters design

From CSSEMediaWiki

This design appeared in the 2004 exam.

Design notes

This is an incomplete framework of classes that track the behaviour of Monsters. More types of Monster are expected to be added later.
The DarkPlaces in which Monsters live and the Humans on which they prey are also modelled.
EtherealMonsters are bodiless; they can walk through walls.
CorporealMonsters have bodies; they can bite().
A Demon can exist only by possessing some other monster. It takes over control of the possessed Monster.
A Mimic pretends to be another CorporealMonster. Usually, it just forwards messages to the original monster, but it can vary behaviour if it wants to.
A Vampire can change its style between behaving like a person and behaving like a bat.
A Lycan is a Human turned into a hairy Monster. When its fullmoon() method is invoked, it tries to hunt a Human and bite() him/her. The bite() of a Lycan turns the victim into another Lycan of the same type.
Monsters lurk in DarkPlaces: UnderBeds, in Wardrobes and Dungeons. If a Dungeon is a Labyrinth, it can have other Dungeons inside it, but it cannot if it is a Cavern.
Monsters and Humans can use an Explorer subclass to look around inside DarkPlaces.
Constructors, getters and setters, and many methods have been omitted from the diagram. Make reasonable assumptions where necessary and state them.