Question

Java netbeans, points out of 10

Exercise#3 Create a class CourseGrades that consists of two data fields, student_id and grade. The class has set and get methods for each data variable. Then, write a Java program that reads students ids and corresponding grades into an array of type CourseGrades and print the average grade for the class. Your program should have two methods in addition to main(), one method for reading the students ids and grades and another method for computing the average grade

Answer 1

// Please find the required solution
import java.util.Scanner;

//Course grade class
public class CourseGrades {

   // declare fields
   int student_id;
   int grade;

   // getters and setters for fields
   public int getStudent_id()
   {
      return student_id;
   }

   public void setStudent_id( int student_id )
   {
      this.student_id = student_id;
   }

   public int getGrade()
   {
      return grade;
   }

   public void setGrade( int grade )
   {
      this.grade = grade;
   }

   // read compute average
   public static float computeAverageGrade( CourseGrades[] courseGrades )
   {
      int sumOfGrades = 0;
      for( CourseGrades courseGrade : courseGrades )
         sumOfGrades += courseGrade.getGrade();
      return sumOfGrades / courseGrades.length;
   }

   // read input from user
   public static CourseGrades[] readCourseGrade()
   {
      System.out.println("Input for 5 students");
      Scanner input = new Scanner(System.in);
      CourseGrades[] courseGrades = new CourseGrades[5];
      for( int i = 0; i < 5; i++ )
      {
         courseGrades[i] = new CourseGrades();
         System.out.print("Input the student Id:");
         courseGrades[i].setStudent_id(input.nextInt());
         System.out.print("Input the student Grade:");
         courseGrades[i].setGrade(input.nextInt());
      }
      input.close();
      return courseGrades;
   }

   public static void main( String[] args )
   {
      // reads 5 student id's and grades
      CourseGrades[] courseGrades = readCourseGrade();

      // print the computed average
      System.out.println("Average of grades:" + computeAverageGrade(courseGrades));
   }
}
Sample output screenshot:

Input for 5 students Input the student Id:1 Input the student Grade:7 Input the student Id:2 Input the student Grade:8 Input the student Id:3 Input the student Grade:8 Input the student Id:4 Input the student Grade:9 Input the student Id:5 Input the student Grade:6 Average of grades:7.0