Chapter 8, Problem 7PE

a.

Explanation of Solution

Program:

File name: “CollegeCourse.java”

//Define a class named CollegeCourse

public class CollegeCourse

{

    //Declare the private variables

    private String courseID;

    private int credits; 

    private char grade;

    //Define a get method that returns the course ID

    public String getID()

    {

        //Return the value

        return courseID;

    }

    //Define a get method that returns the credit hours

    public int getCredits()

    {

        //Return the value

        return credits;

    }

    //Define a get method that returns the letter grade

    public char getGrade()

    {

        //Return the value

        return grade;

    }

    //Define a set method that takes the course ID

    public void setID(String idNum)

    {

        //Assign the value

        courseID = idNum;

    }

    //Define a set method that takes the credit hours

    public void setCredits(int cr)

    {

        //Assign the value

        credits = cr;

    }

    //Define a set method that takes the letter grade

    public void setGrade(char gr)

    {

        //Assign the value

        grade = gr;

    }

}

File name: “Student...

b.

Explanation of Solution

Program:

File name: “InputGrades.java”

//Import necessary header files

import college.CollegeCourse;

import college.Student;

import javax.swing.*;

//Define a class named InputGrades

public class InputGrades

{

    //Define a main method

    public static void main(String[] args)

    {

        //Declare an array to store data of 10 students

        Student[] students = new Student[10];

        //Declare the variables and initialize the values

        int x, y, z;

        String courseEntry, entry  = "",  message;

        int idEntry, credits;

        char gradeEntry = ' ';

        boolean isGoodGrade =  false;

        final int NUM_COURSES = 5;

        //Declare an array to store five grades

        char[] grades = {'A', 'B', 'C', 'D', 'F'};

        //For loop to be executed until x exceeds 10

        for(x = 0; x < students.length; ++x)

        {

            //Create a student object

            Student stu = new Student();

            //Prompt the user to enter the student ID

entry = JOptionPane.showInputDialog(null, "For student #" +

            (x + 1) + ", enter the student ID");

            idEntry  = Integer.parseInt(entry);

            //Function call

            stu.setID(idEntry);

            //For loop to be executed until y exceeds 5

            for(y = 0; y < NUM_COURSES; ++y)

            {

                //Prompt the user to enter the course

                courseEntry = JOptionPane.showInputDialog(null,

                "For student #" + (x + 1) + ", enter course #" +

                (y + 1));

//Prompt the user to enter the credits for each //course

                entry  = JOptionPane.showInputDialog(null,

                "For student #" + (x + 1) +

                ", enter credits for course  #" + (y + 1));

                credits = Integer.parseInt(entry);

                //Assign the value false to isGoodGrade

                isGoodGrade = false;

                //While the user does not enter isGoodGrade

                while(!isGoodGrade)

                {

//Prompt the user to enter the grade for //course

                    entry  = JOptionPane.showInputDialog(null,

                    "For student #" + (x + 1) +

                    ", enter grade for course  #" + (y + 1));

                    gradeEntry = entry...