# COMP-SCI 7202 Practical-03: Object-Oriented Programming – Part II solution

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## Problem 01 – Basic Classes and Object

Object-Oriented Programming Concepts are very important. Without having an idea about OOPS concepts, you will not be able to design systems in the object-oriented programming model. In
this part, you are required to develop several classes for different uses. For each class, you must develop accessors and mutators;

## Problem 02 – Inheritance

By default, all classes in Java inherit from the Object class provided by Java. Therefore, the Object class is the superclass to all other classes and it defines methods that all its subclasses
share. In this problem, you are required to extend from previous Base Classes the Children Classes.

Base classes:
+ Person
++ attributes: givenName (String), lastName (String), age (int), gender (String), citizenship (String)
+ Shape
++ attributes: width (double), height (double), radius (double), length (double)
+ Book
++ attributes: title (String), year (int), publish (String), pages (int)
+ Animal
++ attributes: name (String), weight (double), favouriteFood (String), age (int)

Requirements:
+ Implement Accessors;
+ Implement Mutators;
+ Implement Basic Constructor;
+ Implement Parametric Constructor;
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Inheritance classes:
+ Person
++ Student
+++ attributes: marks (double []), disciplines (String [])
+++ methods: averageMarks(), displayDisciplines ()
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## Problem 03 – Handling Constraints

Consider the Rectangle class you created in the previous exercise. Copy and change it such as you should have two data fields-width and height of int types. The class should have a display()
method, to print the width and height of the rectangle separated by space.

++ Lecturer
+++ attributes: salary (double), disciplines (String [])
+++ methods: annualSalary(), displayDisciplines ()
++ Doctor
+++ attributes: speciality (String)
++ Patient
+++ attributes: diagnostic (String); inTime (String); prevTime (String);
——————————————————————————–
+ Shape
++ Rectangle
+++ methods: area()
++ Circle
+++ methods: area()
++ Triangle
+++ methods: area()
——————————————————————————–
+ Book
++ EBook
+++ attributes: url (String)
++ PhysicalBook
+++ attributes: shelf (int), aisle (int), floor (int)
+++ method: displayBookLocation()
——————————————————————————–
+ Animal
++ Lion
+++ methods: makeSound()
++ Turtle
+++ methods: makeSound()
++ Chameleon
+++ methods: makeSound()

Requirements:
+ Implement Accessors;
+ Implement Mutators;
+ Implement Basic Constructor;
+ Implement Parametric Constructor;
+ Implement methods required;
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DerivedClass
The RectangleArea class is derived from Rectangle class, i.e., it is the sub-class of the Rectangle class. The class should have a read_input() method, to read the values of width and height of
the rectangle (from user input). The RectangleArea class should also overload the display() method to print the area (width*height) of the rectangle. The first and only line of input contains two
space-separated integers denoting the width and height of the rectangle.

The output should consist of exactly two lines:
1. In the first line, print the width and height of the rectangle separated by space.
2. In the second line, print the area of the rectangle.

## Problem 04 – Abstract, Interface Classes, and Polymorphism

A local bike shop or local bicycle shop is a small business specializing in bicycle sale, maintenance, and parts. The expression distinguishes small bicycle shops from large chains and mailorders.

In this problem, you are required to develop a Bicycle Repair Store. The system needs an Input/Output interface to keep track of the bicycles that have been serviced;
Constraints
1 <= width,height <= 10^3
Your code must handle these constraints;
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Input:
12 9
Output:
12 9
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Interface Class:
+ Vehicle
++ methods: changeGear (int), checkBrakes ()
Abstract Class
+ VehicleAbstract
++ attributes: color, year, numberGears
Base Class
+ Bicycle
++ attributes: is_serviced (bool), inDate (String), outDate (String), serviceResponsible (String)
++ methods: checkoutService()

Children Classes
+ Electric Bike
++ attributes: battery;
++ methods: chargeBike();
+ MountainBike
++ attributes: suspension (String), forks (string)
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Total points: 100.0

#### Basic Marking Scheme

Criteria Ratings Pts
20.0 pts
40.0 pts
10.0 pts
30.0 pts
++ attributes: tyres (String)
+ Hibrid
++ attributes: suspension (String)
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Compilation
In order to achieve full marks – your code must compile and run;

Basic Functionality
Your code (1) perform all the functions correctly, (2) use latest concepts learned in class, (3) has a clear, creative and sophisticated way of solving the problem.

Functionality Extension
Your code (1) perform all the functions correctly, (2) use latest concepts learned in class, (3) has a clear, creative and sophisticated way of solving the problem, and (4) you propose novel ways to
solve the problems – or extra functionalities.

Code Formatting
Your code (1) has the right proportion of comments and place line and block comments correctly, (2) follow correct indentation every new indentation level, (3) has good variable naming, (4) has
clear organization between tabs and is easy to read.