Question

Assignment 4 Java

You are required, but not limited, to turn in the following source files:

Assignment4.java

Club.java

President.java

New Skills to be Applied

In addition to what has been covered in previous assignments, the use of the following items, discussed in class, will probably be needed:

Classes
Instance Objects
Accessors/Mutators(Modifiers) methods
Visibility Modifiers (Access specifier) - public, private, etc.
Encapsulation concept
Aggregation relationship between classes

Program Description

The following is the description of Assignment4 class.

The driver program will allow the user to interact with your other class modules. The purpose of this module is to handle all user input and screen output. The main method should start by displaying the following menu in this exact format:

Choice\t\tAction\n
------\t\t------\n
A\t\tAdd Club\n
D\t\tDisplay Club\n
Q\t\tQuit\n
?\t\tDisplay Help\n\n

Next, the following prompt should be displayed:

What action would you like to perform?\n

Read in the user input and execute the appropriate command. After the execution of each command, re-display the prompt. Commands should be accepted in both lowercase and uppercase.

Add Club

Your program should display the following prompt:

Please enter the Club information::\n
Enter its name:\n

Read in the user input and set the club name on the club object. Then it will ask a user to enter its number of members, its university, its president's first name, last name, and academic level.

Read in the user input and set them on the club object.

Note that there is only one Club object in this assignment. Thus when "Add Club" option is selected more than once, the new one overwrites the old Club object information.

Display Club

Your program should display the club information in the following format:

\nClub Name:\t\tSwimming Club\n
Number Of Members:\t87\n
University:\t\tArizona State University\n
President:\t\tWater,Bob(Senior)\n\n

Make use of the toString method of the Club class to display this information. The toString method is used together with System.out.print method.
(System.out should NOT to be used within the toString method.)

Quit

Your program should stop executing and output nothing.

Display Help

Your program should redisplay the "choice action" menu.

Invalid Command

If an invalid command is entered, display the following line:

Unknown action\n

President Class

The President class describes information of a president of a club. It has following attributes:

Attribute Name	Attribute Type	Description
firstName	String	first name of the president
lastName	String	last name of the president
academicLevel	String	academic level of the president, such as senior, junior, etc.

The following constructor should be provided to initialize each attribute. This constructor initializes the value of string attributes to "?".
  public President( )

The following accessor methods should be provided to get the attributes:
public String getFirstName()
public String getLastName()
public String getAcademicLevel()

The following modifier(mutator) methods should be provided to set the attributes:
public void setFirstName(String someFirstName)
public void setLastName(String someLastName)
public void setAcademicLevel(String someLevel)

The following method must be defined:

  public String toString()

toString method should return a string of the following format:

Water,Bob(Senior)
where "Water" is the last name of a president, "Bob" is the first name, and "Senior" is the academic level. So you need to insert "," or parentheses between these variables.
Note that you can choose a meaningful parameter variable name for each method.

Club Class

The Club class describes a club. It has the following attributes

Attribute Name	Attribute Type	Description
clubName	String	name of the Club
numberOfMembers	int	Number of members of the Club
university	String	university of the Club
currentPresident	President	current president of the Club

The following constructor should be provided to initialize each attribute. This constructor initializes the value of string attributes to "?" and the value of integer attribute to 0,
and an object of President using the constructor of the President class.
  public Club( )

The following accessor methods should be provided to get the attributes:
public String getClubName()
public int getNumberOfMembers()
public String getUniversity()
public President getCurrentPresident()

The following modifier(mutator) methods should be provided to change the attributes:
public void setClubName(String someName)
public void setNumberOfMembers(int someNumber)
public void setUniversity(String someUniversity)
public void setCurrentPresident(String firstName, String lastName, String someLevel)

The following method must be defined:

  public String toString()

The toString() method constructs a string of the following format:

\nClub Name:\t\tSwimming Club\n
Number Of Members:\t87\n
University:\t\tArizona State University\n
President:\t\tWater,Bob(Senior)\n\n

Assignment4.java

import java.util.*;

public class Assignment4

{

public static void main (String[] args)

{

// local variables, can be accessed anywhere from the main method

char input1 = 'Z';

String inputInfo;

String clubName, university, firstName, lastName, academicLevel,

numOfMembersStr;

int numOfMembers;

String line = new String();

// instantiate a Club object

Club club1 = new Club();

printMenu();

//Create a Scanner object to read user input

Scanner scan = new Scanner(System.in);

do // will ask for user input

{

System.out.println("What action would you like to perform?");

line = scan.nextLine();

if (line.length() == 1)

{

input1 = line.charAt(0);

input1 = Character.toUpperCase(input1);

// matches one of the case statement

switch (input1)

{

case 'A': //Add Club

System.out.print("Please enter the Club information:\n");

System.out.print("Enter its name:\n");

clubName = scan.nextLine();

club1.setClubName(clubName);

System.out.print("Enter its number of members:\n");

numOfMembersStr = scan.nextLine();

numOfMembers = Integer.parseInt(numOfMembersStr);

club1.setNumberOfMembers(numOfMembers);

System.out.print("Enter its university:\n");

university = scan.nextLine();

club1.setUniversity(university);

System.out.print("Enter its president's first name:\n");

firstName = scan.nextLine();

System.out.print("Enter its president's last name:\n");

lastName = scan.nextLine();

System.out.print("Enter its president's academic level:\

n");

academicLevel = scan.nextLine();

club1.setCurrentPresident(firstName, lastName,

academicLevel);

break;

case 'D': //Display Club

System.out.print(club1);

break;

case 'Q': //Quit

break;

case '?': //Display Menu

printMenu();

break;

default:

System.out.print("Unknown action\n");

break;

}

}

else

{

System.out.print("Unknown action\n");

}

} while (input1 != 'Q' || line.length() != 1);

}

/** The method printMenu displays the menu to a user **/

public static void printMenu()

{

System.out.print("Choice\t\tAction\n" +

"------\t\t------\n" +

"A\t\tAdd Club\n" +

"D\t\tDisplay Club\n" +

"Q\t\tQuit\n" +

"?\t\tDisplay Help\n\n");

}

}

Test Cases

Use the following test cases to ensure that your program works for all of them:

Input #1:

A

Swimming Club

87

Arizona State University

Bob

Water

Senior

D

A

Hiking Club

43

University of Arizona

Meg

Walker

Graduate

D

Q

Output #1:

Choice Action

------ ------

A Add Club

D Display Club

Q Quit

? Display Help

What action would you like to perform?

Please enter the Club information:

Enter its name:

Enter its number of members:

Enter its university:

Enter its president's first name:

Enter its president's last name:

Enter its president's academic level:

What action would you like to perform?

Club Name: Swimming Club

Number Of Members: 87

University: Arizona State University

President: Water,Bob(Senior)

What action would you like to perform?

Please enter the Club information:

Enter its name:

Enter its number of members:

Enter its university:

Enter its president's first name:

Enter its president's last name:

Enter its president's academic level:

What action would you like to perform?

Club Name: Hiking Club

Number Of Members: 43

University: University of Arizona

President: Walker,Meg(Graduate)

What action would you like to perform?

Input #2:

A

Singing Club

41

Arizona State University

Sophie

Music

Junior

D

?

Q

Output #2:

Choice Action

------ ------

A Add Club

D Display Club

Q Quit

? Display Help

What action would you like to perform?

Please enter the Club information:

Enter its name:

Enter its number of members:

Enter its university:

Enter its president's first name:

Enter its president's last name:

Enter its president's academic level:

What action would you like to perform?

Club Name: Singing Club

Number Of Members: 41

University: Arizona State University

President: Music,Sophie(Junior)

What action would you like to perform?

Choice Action

------ ------

A Add Club

D Display Club

Q Quit

? Display Help

What action would you like to perform?

Answer 1

The Java code is given below:
********************************* Assignment4.java ******************************************

import java.util.*;
import java.lang.NullPointerException;

public class Assignment4
{
    /* Main method */
    public static void main (String[] args) throws NullPointerException
    {
        char input1 = 'Z';
        String inputInfo;
        String clubName, university, firstName, lastName, academicLevel,numOfMembersStr;
        int numOfMembers;
        String line = "";
        /* intantiate object of Club class */
        Club club1 = new Club();
        printMenu();
        Scanner scan = new Scanner(System.in);
        do
        {
            System.out.println("What action would you like to perform?");
            line = scan.nextLine();
            if (line.length() == 1)
            {
                input1 = line.charAt(0);
                input1 = Character.toUpperCase(input1);
                switch (input1)
                {
                    case 'A': //Add Club
                        System.out.print("Please enter the Club information:\n");
                        System.out.print("Enter its name:\n");
                        clubName = scan.nextLine();
                        club1.setClubName(clubName);
                        System.out.print("Enter its number of members:\n");
                        numOfMembersStr = scan.nextLine();
                        numOfMembers = Integer.parseInt(numOfMembersStr);
                        club1.setNumberOfMembers(numOfMembers);
                        System.out.print("Enter its university:\n");
                        university = scan.nextLine();
                        club1.setUniversity(university);
                        System.out.print("Enter its president's first name:\n");
                        firstName = scan.nextLine();
                        System.out.print("Enter its president's last name:\n");
                        lastName = scan.nextLine();
                        System.out.print("Enter its president's academic level:\n");
                        academicLevel = scan.nextLine();
                        club1.setCurrentPresident(firstName, lastName, academicLevel);
                        break;
                    case 'D': //Display Club
                        System.out.print(club1);
                        break;
                    case 'Q': //Quit
                        break;
                    case '?': //Display Menu
                        printMenu();
                        break;
                    default:
                        System.out.print("Unknown action\n");
                        break;
                }
            }
            else
            {
                System.out.print("Unknown action\n");
            }
        } while (input1 != 'Q' || line.length() != 1);
    }
    /** The method printMenu displays the menu to a user **/
    public static void printMenu()
    {
        System.out.print("Choice\t\tAction\n" +
                "------\t\t------\n" +
                "A\t\tAdd Club\n" +
                "D\t\tDisplay Club\n" +
                "Q\t\tQuit\n" +
                "?\t\tDisplay Help\n\n");
    }
}

******************************** President.java ***********************************************

public class President {
    /* Data members of the class */
    private String firstName;
    private String lastName;
    private String academicLevel;
    /* Getter function of firstName */
    public String getFirstName() {
        return firstName;
    }
    /* Setter function for firstName */
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    /* Getter function for lastName */
    public String getLastName() {
        return lastName;
    }
    /* Setter function for lastName */
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    /* Getter function for academicLevel */
    public String getAcademicLevel() {
        return academicLevel;
    }
    /* Setter function for academicLevel */
    public void setAcademicLevel(String academicLevel) {
        this.academicLevel = academicLevel;
    }
    /* toString method to concat the data  members to one string */
    public String toString() {
        return this.getLastName() + "," + this.getFirstName()
                + "(" + this.getAcademicLevel() + ")";
    }
}

********************************* Club.java ************************************************

public class Club {
    /* Data members of the class */
    private String clubName;
    private int numberOfMembers;
    private String university;
    private President currentPresident;
    /* Getter function of clubName */
    public String getClubName() {
        return clubName;
    }
    /* Setter function of clubName */
    public void setClubName(String clubName) {
        this.clubName = clubName;
    }
    /* Getter function of numberOfMembers */
    public int getNumberOfMembers() {
        return numberOfMembers;
    }
    /* Setter function of numberOfMembers */
    public void setNumberOfMembers(int numberOfMembers) {
        this.numberOfMembers = numberOfMembers;
    }
    /* Getter function of university */
    public String getUniversity() {
        return university;
    }
    /* Setter function of university */
    public void setUniversity(String university) {
        this.university = university;
    }
    /* Getter function of currentPresident */
    public President getCurrentPresident() {
        return currentPresident;
    }
    /* Setter function of currentPresident */
    public void setCurrentPresident(String firstName, String lastName, String academicLevel) {
        this.currentPresident = new President();
        currentPresident.setFirstName(firstName);
        currentPresident.setLastName(lastName);
        currentPresident.setAcademicLevel(academicLevel);
    }
    /* toString method to concat the data  members to one string */
    public String toString() {
        return "\nClub Name:\t\t" + getClubName() +
                "\nNumber Of Members:\t" + getNumberOfMembers() +
                "\nUniversity:\t\t" + getUniversity() +
                "\nPresident:\t\t" + getCurrentPresident() + "\n\n";
    }
}

Sample Input and Output:

Screenshot of the codes is given below:

********************************* Assignment4.java ******************************************

******************************** President.java ***********************************************

********************************* Club.java ************************************************

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