Theme Park -
Homework Revising Abstract Classes, Interfaces and Polymorphism. Learning Objectives Practice modelling a large real world domain and what you have learned about using:
classes inheritance abstract classes interfaces ThemePark MVP Classes and Abstract Classes Model a ThemePark (with various Attractions.Attraction and Stalls) and its Visitors.
Remember to model class diagrams first, then write tests, then write code.
Visitor has age, height, money Using an Attractions.Attraction abstract class (which has a name), create some subclasses for Rollercoaster, Dodgems, Park, Playground Using a Stalls.Stall abstract class (which has a name, ownerName and parkingSpot), create some classes for Stalls.IceCreamStall, Stalls.CandyFlossStall, TobaccoStall Interfaces Introduce some Interfaces to enable charging, restricting and reviewing attractions and stalls:
ITicketed promises double defaultPrice() and double priceFor(Visitor)
ISecurity promises boolean isAllowedTo(Visitor)
IReviewed promises int getRating() and String getName()
Have some of the classes implement these interfaces. Below are the rules about what the implementations should be:
Playground implements ISecurity because it has a maximum age of 15
TobaccoStall implements ISecurity because it has a minimum age of 18
Rollercoster implements ISecurity and requires a visitor to be over 145cm tall and over 12 years of age
Polymorphism All Attractions and Stalls have a class variable int rating All Attractions and Stalls implement IReviewed and implement a getter for int getRating() and String getName() ThemePark has a method getAllReviewed() which returns an ArrayList of IReviewed Extensions Classes and Abstract Classes ThemePark stores all Attractions and Stalls in it. ThemePark has a method visit(Visitor, Attractions.Attraction) Interfaces Note: Starting prices are: £8.40 Rollercoaster, £4.50 Dodgems, £2.80 Stalls.IceCreamStall, £4.20 Stalls.CandyFlossStall, £6.60 TobaccoStall
Rollercoaster implements ITicketed and charges tall people over 200cm double fee Dodgems implements ITicketed and charge half price to children under 12 years old All Stalls implements ITicketed but they use a starting price whoever is buying Park and Playground have no ticketing gate so do not implement ITicketed for these, but all other Attractions do. Polymorphism ThemePark has a method getAllAllowedFor(Visitor) which takes a Visitor and returns an ArrayList of ITicketed ThemePark has a method that can return a string with all reviews, returning a String a little bit like this: Rollercoster: 4, Dodgems: 8, Park: 2, IceCream: 6, TobaccoStall: 1