Question

Design a class named Student that contains the followingprivate instance variables:

• A string data field name for the student name.

• An integer data field id for the student id.

• A double data field GPA for the student GPA.

• An integer data field registeredCredits.

  It contains the following methods:

• An empty default constructor.

• A constructor that creates a student record with a specified id and

  name.

• The get and set methods for id, name, GPA, and

  registeredCredits.

• A method called registerCredit that adds specified amount of

  credits to the student.

• A method called withdrawCredit that withdraws specified

  amount of credits from the student.

1. Implement the class.

2. Write a test program that creates a student account using your

   name and id. Set all the variables information to your student information (GPA, and registered credits). Use the registerCreditmethod to add 9 more credits. Use the method withdrawCreditto withdraw 3 credits. Then prints out all the student information:name, id, GPA, and registerdCredits.
   
   Sample Output:
   Enter your GPA: 3.9
   Enter your registered credits: 30Student name: Sara
   Student ID: 12345678
   GPA: 3.9
   Registered credits: 36
   
   (( in java ))

Answer 1

SOURCE CODE:

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.

Student.java

class Student
{
private String name;
private int id;
private double gpa;
private int registeredCredits;

// Constructor
Student(){
}
public Student(String name, int id) {
this.name = name;
this.id = id;
}

//Setter and getter
public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public double getGpa() {
return gpa;
}

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

public int getRegisteredCredits() {
return registeredCredits;
}

public void setRegisteredCredits(int registeredCredits) {
this.registeredCredits = registeredCredits;
}
  
//methods
public void registerCredit(double amount)
{
registeredCredits += amount;
}

public void withdrawCredit(double amount)
{
registeredCredits -= amount;
}
}

StudentTest.java

import java.util.Scanner;

public class StudentTest
{
    public static void main(String[] args) {
        Scanner scanner= new Scanner(System.in);

        // create object
        Student student = new Student("Sara", 12345678);

        //read GPA
        System.out.print("Enter Your GPA: ");
        double gpa= scanner.nextDouble();
        student.setGpa(gpa);

        //read Credits
        System.out.print("Enter Your registered credits: ");
        int credits= scanner.nextInt();
        student.setRegisteredCredits(credits);

        // add credits
        student.registerCredit(9);

        //remove credits
        student.withdrawCredit(3);

        //print data
        System.out.println("Student name: "+student.getName());
        System.out.println("Student ID: "+student.getId());
        System.out.println("GPA: "+student.getGpa());
        System.out.println("Registered credits: "+student.getRegisteredCredits());


    }
}

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