OOPDA Midterm Exam Part $4$: Design A Mattress Hierarchy!

Problem Description

The Sleep$-$Eze Store offers a number of kinds of mattresses for their customers. Your design will be used to develop an online application so customers or sales reps can select applicable features to customize an order for a mattress. Your challenge will be to design a hierarchy of classes and some interfaces to support the desired functionality.

The store offers four main products:

Super$-$Soft $-$ has our most plush covering

Supportive $-$ an extra firm sleep foundation

Deluxe $--$ loaded with features for advanced sleep technology

Economy $--$ a quality product for budget$-$conscious shoppers

All mattresses are available in standard size and queen size. Deluxe brand is also available in king size. Each mattress has a base price for an available size.

Some features that can be selected for some products for additional cost:

Firmness$-$selector $-$ electronically customize the firmness

Vibrator $-$ offers soothing massage to aid in getting to sleep

Heat $--$ a gentle warming feature for cold winter nights

Hypo$-$Allergenic $-$ can be ordered in coverings that minimize allergic issues

Features can be added as follows:

Super$-$Soft: Hypo$-$Allergenic

Supportive: Heat, Vibrator

Deluxe: Firmness$-$selector, Hypo$-$Allergenic, Vibrator