Laboratory - Design Voting System

Introduction

This lab is about designing an object-oriented voting system, written in java, that will illustrate the principles of object-oriented programming.

Classes

Person (Person.java)

This will be an abstract class. In this class we have used the concept of inheritance as the candidate class and voter class are child classes so they can access the methods of parent class.

Must have the following variables:

age : int - private

gender : char - private, will hold values like M, F, T, U

firstName : String - protected

lastName : String - protected

politicalParty : String - protected, will hold values like Democrat, Republican, Non-Affiliate

Must have the defined constructor:

Person ( )

Person (int age, char gender, String firstName, String lastName, String politicalParty) Which will set the passed properties to our defined variables

Will implement the following public methods:

getAge() - returns int

getGender() - returns char

Will define the following abstract methods:

getFullName() - returns String

Candidate (Candidate.java)

This class holds the information about the candidate it will extend the class Person.

Must have the following variables:

voteCount : int - private, when the class is instantiated this should default to 0

Must have the defined constructor:

Candidate ( )

Candidate (int age, char gender, String firstName, String lastName, String politicalParty) Which will set the passed properties to our defined variables and super class

Will implement the following public methods:

getVoteCount() - returns int

incrementVoteCount() - void, increments the voteCount

getFullName() - returns String

If the candidates firstName = John and lastName = Smith and political party is Democrat then it returns John Smith - D

If the candidates firstName = John and lastName = Smith and political party is Republican then it returns John Smith - R

If the candidates firstName = John and lastName = Smith and political party is Non-Affiliate then it returns John Smith - NA

Otherwise John Smith

Voter (Voter.java)

This class will gather the information about the voter it will extend the class Person.

Must have the following variables:

voterId : int - private

voted : boolean - private, when the class is instantiated this should default to false

Must have the defined constructor:

Voter ( )

Voter (int voterId, int age, char gender, String firstName, String lastName, String politicalParty)

Which will set the passed properties to our defined variables and super class

Will implement the following public methods:

getVoterId() - returns int

hasVoted() - returns boolean

voted() - void, sets the voted flag to true

getFullName() - returns string - e.g. firstName = John and lastName = Smith then it returns John Smith

Voting Machine (VotingMachine.java)

This class is used to manipulate and print the results (i.e. who is the winner and how many votes he/she gained). This class has crucial role in whole system

Must have the following variables:

candidates : Candidate[ ] - public, array of all candidates in the race

Must have the defined constructor:

VotingMachine (Candidate candidates[ ]) Which will set the passed properties to our defined variables

Will implement the following public methods:

vote(Voter v, Candidate c) - void, counts vote (increments candidate count) and marks voter as voted

We will not handle the scenario that a voter votes for a candidate not in the election

vote(Voter v) - void, if voter has not voted, marks voter as voted.

tally() - void, prints results and winner.

For example we have the following candidates

(Sam Smith - R, Joe Dean - D, Jane Doe - NA) the out print will be like

Sam Smith - R has 5 votes.

Joe Dean - D has 2 votes.

Jane Doe - NA has 7 votes.

Jane Doe - NA won with 7 votes.

We will not handle the case for ties at the moment, so the first candidate to have the

most votes wins.

Testing

You can test your codes by compile and execute the provided file-Election.java.

You will see the printout as

Jane Doe R has 4 votes. John Smith - D has 2 votes. Fred Johnson NA has 1 votes. Jane Doe R won with 4 votes