Question

Question 1 - Create a class named Student that has fields for an ID number, number of credit hours earned, and number of points earned. (For example, many schools compute grade point averages based on a scale of 4, so a three-credit-hour class in which a student earns an A is worth 12 points.) Include methods to assign values to all fields. A Student also has a field for grade point average. Include a method to compute the grade point average field by dividing points by credit hours earned. Write methods to display the values in each Student field. Save this class as Student.java.

Answer 1

Hi,

Hope you doing fine. I have coded the above question in java keeping all the conditions in mind. The code is explained clearly using comments that have been highlighted in bold. Note that I have named my file as Student1.java as I already had another file called Student.java. You may name the file as per your convenience. Also, pleae note that the file name and class name must be same. I have written an additional class called Test (Test.java) which contains main() and is used to show the output of Student1 class.

Program:

Student1.java

public class Student1 {
  
   //declaring instance variables
   int ID;
   int credit_hrs;
   int num_of_pts;
   //considering gpa in double as it is the average
   double gpa;
  
   //method to set ID
   public void setID(int iD) {
       ID = iD;
   }
   //method to set the value of credit_hrs
   public void setCredit_hrs(int credit_hrs) {
       this.credit_hrs = credit_hrs;
   }
   //method to set the value of num_of_pts
   public void setNum_of_pts(int num_of_pts) {
       this.num_of_pts = num_of_pts;
   }
   //method to calculate and set the gpa
   public void calculate_Gpa() {
       //gpa is calculated by dividing the number of pts by the credit hrs earned
       this.gpa=(double)num_of_pts/credit_hrs;
   }
   //method to print value of ID
   public void getID() {
       System.out.println("ID: "+ID);
   }
   //method to print credit_hrs
   public void getCredit_hrs() {
       System.out.println("Credit hours: "+credit_hrs);
   }
   //method to print num_of_pts
   public void getNum_of_pts() {
       System.out.println("Number of points earned: "+num_of_pts);
   }
   //method to print gpa
   public void getGpa() {
       System.out.println("Grade point average: "+gpa);
   }

}

Program:

Test.java

import java.util.Random;

public class Test {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       //creating new object for Student
       Student1 s=new Student1();
       //setting the values of ID, credit_hrs and num_of_pts
       s.setID(1);
       s.setCredit_hrs(3);
       s.setNum_of_pts(12);
       //calculating gpa
       s.calculate_Gpa();
       //displaying all values
       s.getID();
       s.getCredit_hrs();
       s.getNum_of_pts();
       s.getGpa();

   }

}

Executable code snippets:

Student1.java

Test.java

Output: