Question

you must implement public class Student by following the instructions as follows exactly. You may reference Chapter 7 for the similar examples to get the ideas and concepts.

Each student must have the following 5 attributes (i.e., instance variables):

1. private String   studentID ;              // student’s ID such as                         1
2. private String lastName   ;                         // student’s last name such as              Doe
3. private String firstName ;             // student’s first name such as            John
4. private double gpa ;                         // student’s GPA such as                     45
5. private String   phoneNumber ;      // student’s phone number such as     323-415-5476   

     

You must declare the following 3 static variables with proper initial values:

            private static int  countStudents = 0 ;     // count the total number of students being constructed

            private static double  totalGpa = 0.0 ;   // total GPA sum of all students    // don’t use float

private static double  averageGpa = 0.0 ;   // average GPA of all students // don’t use float   

You must create one constructor, 5 accessors (getters), and 5 mutators (setters) for this Student class.

The constructor method Student must do all the following completely and properly:

1. create a new student by assigning attributes with all the data arguments being passed;
2. countStudents++ ; // increment the student count by one since we just added a new student
3. update the current GPA total and average properly as follows:

totalGpa += gpa ;      // add this student’s gpa to totalGpa

averageGpa = totalGpa / countStudents ; // computer current averageGpa

1. call printStudentRecord to print the complete record nicely for this new student

You must also create the following 2 static methods:

(a) toString – to form a student record properly as a string for printing;

(b) printStudentRecord – to print the student record in a nice format using toString method.

Therefore, at least 13 methods are to be created by you.

You must write a while loop asking the user to enter student id, last name, first name, GPA, and phone number. Then, you print the student record nicely, and show the current student count, total GPA, and average GPA. Then, continue asking the user to enter next student’s data. If the student id is 0 (i.e., zero), thank the user and stop your program nicely.

You must test your program (as follows) in your static void main method. Another optional way (if you know how) is to write a client class to test your program accordingly.

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Your complete testing input and output for this lab assignment must be as follows:

>> Please enter student id, last name, first name, GPA, and phone number>

1 Doe John 3.0 626-111-5428

Student id: 1, Last Name: Doe, First Name: John, GPA: 3.00, Phone Number: 626-111-5428

Current Student Count: 1, Total GPA: 3.00, Average GPA: 3.00

>> Please enter student id, last name, first name, GPA, and phone number>

2   Smith Mary 4.0   626-222-5555

Student id: 2, Last Name: Smith, First Name: Mary, GPA: 4.00, Phone Number: 626-222-5555

Current Student Count: 2, Total GPA: 7.00, Average GPA: 3.50

>> Please enter student id, last name, first name, GPA, and phone number>

3   Stone   Joe   2.0   626-333-5555

Student id: 3, Last Name: Stone, First Name: Joe, GPA: 2.00, Phone Number: 626-333-5555

Current Student Count: 3, Total GPA: 9.00, Average GPA: 3.00

>> Please enter student id, last name, first name, GPA, and phone number>

4   Lin     Steve   1.0   626-444-4444

Student id: 4, Last Name: Lin, First Name: Steve, GPA: 1.00, Phone Number: 626-444-4444

Current Student Count: 4, Total GPA: 10.00, Average GPA: 2.50

>> Please enter student id, last name, first name, GPA, and phone number>

5   Li      Pete   3.0   626-555-6666

Student id: 5, Last Name: Li, First Name: Pete, GPA: 3.00, Phone Number: 626-555-6666

Current Student Count: 5, Total GPA: 13.00, Average GPA: 2.60

>> Please enter student id, last name, first name, GPA, and phone number>

6   Bee     Scott    4.0   626-666-6666

Student id: 6, Last Name: Bee, First Name: Scott, GPA: 4.00, Phone Number: 626-666-6666

Current Student Count: 6, Total GPA: 17.00, Average GPA: 2.8333333

>> Please enter student id, last name, first name, GPA, and phone number>

7   Codd   April   3.80   626-777-7777

Student id: 7, Last Name: Cod, First Name: April, GPA: 3.80, Phone Number: 626-777-7777

Current Student Count: 7, Total GPA: 20.80, Average GPA: 2.9714

>> Please enter student id, last name, first name, GPA, and phone number>

0     no           0.00     no

>> Thank you for using our Student program! See you later!

Answer 1

Thanks for posting the question, here is the complete class and output screenshot

thank you and do give a thumbs up !!

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import java.util.Scanner;

public class Student {

    private String studentID;
    private String lastName;
    private String firstName;
    private double gpa;
    private String phoneNumber;

    private static int countStudents = 0;
    private static double totalGpa = 0.0;
    private static double averageGpa = 0.0;

    public Student(String studentID, String lastName, String firstName, double gpa, String phoneNumber) {
        this.studentID = studentID;
        this.lastName = lastName;
        this.firstName = firstName;
        this.gpa = gpa;
        this.phoneNumber = phoneNumber;

        countStudents++;
        totalGpa += gpa;
        averageGpa = totalGpa / countStudents;
    }

    public String getStudentID() {
        return studentID;
    }

    public void setStudentID(String studentID) {
        this.studentID = studentID;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public double getGpa() {
        return gpa;
    }

    public void setGpa(double gpa) {
        this.gpa = gpa;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    @Override
    public String toString() {
        return "Student id: " + getStudentID() +
                ", Last Name: " + getLastName() +
                ", First Name: " + getFirstName() +
                ", GPA: " + getGpa() +
                ", Phone Number: " + getPhoneNumber();
    }

    

public void printStudentRecord() {
    System.out.println(this);
    System.out.println("Current Student Count: " + countStudents +
            ", Total GPA: " + String.format("%.2f",totalGpa) + ", Average GPA: " + String.format("%.2f",averageGpa)
    );
}

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        for (int i = 1; i <= 7; i++) {
            System.out.println("Please enter student id, last name, first name, GPA, and phone number>");
            String[] data = scanner.nextLine().split("\\s+");
            Student aStudent = new Student(data[0], data[1], data[2],
                    Double.parseDouble(data[3]), data[4]);
            aStudent.printStudentRecord();
        }
        System.out.println("Thank you for using our Student program! See you later!");
    }
}

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thanks !