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...

Question

Create 6 users: Don, Liz, Shamir, Jose, Kate, and Sal. Create 2 groups: marketing and research. Add Shamir, Jose, and Kate to the marketing group. Add Don, Liz, and Sal to the research group. Create a shared directory for each group. Create two files to put into each directory: spreadsheetJanuary.txt meetingNotes.txt Assign access permissions to the directories: Groups should have Read+Write access Leave owner permissions as they are “Everyone else” should not have any access Submit for grade: Screenshot of /etc/passwd contents showing your new users Screenshot of /etc/group contents showing new groups with their members Screenshot of shared directories you created with files and permissions

Answer 1

Expert Solution & Answer

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...

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