Question

This program will calculate the amount for a semester bill at The University of Nantucket.

Part 1:

Create a class Course.java:

The class has non-static instance variables:

private String department

private int courseNumber

private int courseCredits

private double courseCost

The class must have a default constructor which will set values as follows:

department = 0

courseNumber = 0

courseCost = 0

The class must a non-default constructor which will set values as follows:

department = value passed to constructor

courseNumber = value passed to constructor

courseCredits = value passed to constructor

courseCost = no value will be passed to the constructor, courseCost will be calculated as courseCredits * $120

The class must have the appropriate getter and setter methods. The setter methods must trap the user to enter valid information as follows:

courseNumbers must be 100 - 499 (inclusive)

courseCredits must be 1, 3, or 4

department must be ENG, MTH, CSC, HST, HUM, SCI, LAN, PHY

The class must have a toString method and an equals method.

Part 2:

Create a subclass LabCourse.java which adds $50 to the courseCost.

The class must have the appropriate default and non-default constructors.

Getter and setter methods are not needed.

The class must have a toString method and an equals method. Both of those methods must override the inherited toString and equals methods.

A course is a lab course if the department is CSC, SCI or PHY.

Part 3:

Develop a program (DemoNantucket.java) that asks the user for the number of courses they will take, creates an array of Courses, gets the information for each course (department, courseNumber, courseCredits), creates instances of the appropriate class, populates the array with the instances, calculates the cost of each course and the total bill and then prints the information for each course and the total of the bill to the user.

Submit all 3 files.

Answer 1

Note: Done accordingly. Please comment for any problem. Please Uprate. Thanks.

Code:

DemoNantucket.java

import java.util.Scanner;

public class DemoNantucket {

   static void print(String msg){
       System.out.println(msg);
   }
   public static void main(String[] args) {
       // TODO Auto-generated method stub
       Scanner input=new Scanner(System.in);
       int totalCourses;
       String department;
       int courseNumber;
       int courseCredits;
       double totalCost=0;
      
       print("Please give total number of course.");
       totalCourses=Integer.parseInt(input.nextLine());
       Course[] courseArray = new Course[totalCourses];
       for(int i=0;i<totalCourses;i++){
               print("Please give department :");
               department=input.nextLine();
               print("Please give course Number (100-499) :");
               courseNumber=Integer.parseInt(input.nextLine());
               print("Please give course credits (1,2 or 3) :");
               courseCredits=Integer.parseInt(input.nextLine());              
               if(department.equals("PHY") || department.equals("CSC")|| department.equals("SCI")){
                   LabCourse temp=new LabCourse(department,courseNumber,courseCredits);
                   courseArray[i]=temp;
               }else{
                   Course temp=new Course(department,courseNumber,courseCredits);
                   courseArray[i]=temp;
               }
               totalCost+=courseArray[i].getCourseCost();
       }
       for(int i=0;i<totalCourses;i++){
           print(courseArray[i].toString());
       }
       print("Total Bill is :"+totalCost);
       input.close();
   }

}

---------------------------------------

Course.java

public class Course {
       private String department;
       private int courseNumber;
       private int courseCredits;
       private double courseCost;
      
  
   public Course() {
       this.department="0";
       this.courseNumber=0;
       this.courseCost=0;
   }
  
   public Course(String department,int courseNumber,int courseCredits){
       setDepartment(department);
       setCourseNumber(courseNumber);
       setCourseCredits(courseCredits);
       setCourseCost(courseCredits*120);
   }
  
   public double getCourseCost() {
       return courseCost;
   }
   public void setCourseCost(double courseCost) {
       this.courseCost = courseCost;
   }
   public int getCourseCredits() {
       return courseCredits;
   }
   public void setCourseCredits(int courseCredits) {
       if(courseCredits == 1 || courseCredits == 2 ||courseCredits == 3){
       this.courseCredits = courseCredits;
       }else{
           throw new IllegalArgumentException("Course Credits can be 1, 2 or 3 only.");
       }
   }
   public int getCourseNumber() {
       return courseNumber;
   }
   public void setCourseNumber(int courseNumber) {
       if(courseNumber>=100 && courseNumber<=499){
       this.courseNumber = courseNumber;
       }else{
           throw new IllegalArgumentException("CourseNumbers must be 100 - 499 (inclusive)");
       }
   }
   public String getDepartment() {
       return department;
   }
   public void setDepartment(String department) {
       if(department.equals("ENG") || department.equals("MTH") || department.equals("CSC") || department.equals("HST") || department.equals("HUM") || department.equals("SCI") || department.equals("LAN") || department.equals("PHY"))
       this.department = department;
       else
           throw new IllegalArgumentException("department must be ENG, MTH, CSC, HST, HUM, SCI, LAN, PHY");
   }
  
   @Override
   public String toString(){
       String courseDetails;
       courseDetails = "Department :"+getDepartment()+"\n";
       courseDetails += "Course Number :"+getCourseNumber()+"\n";
       courseDetails += "Course Cost :"+getCourseCost()+"\n";
       courseDetails += "Course credits :"+getCourseCredits()+"\n";
       return courseDetails;
   }
  
   public boolean equals(Course obj)
   {
       if (this == obj)
       return true;
       if (obj == null)
       return false;
       if (getClass() != obj.getClass())
       return false;
   if(obj.getDepartment().equals(getDepartment()) && obj.getCourseCredits()== getCourseCredits() && obj.getCourseNumber() == getCourseNumber()){
       return true;
   }else{
       return false;
   }
   }
}
---------------------------------------------

LabCourse.java

public class LabCourse extends Course {
   public LabCourse(){
       super();
   }
  
   public LabCourse(String department,int courseNumber,int courseCredits){
       super(department,courseNumber,courseCredits);
       if(department.equals("PHY") || department.equals("CSC")|| department.equals("SCI")){
           setCourseCost(getCourseCost()+50);
       }else{
           throw new IllegalArgumentException("A course is a lab course if the department is CSC, SCI or PHY.");
       }
   }
  
   @Override
   public String toString(){
       String courseDetails;
       courseDetails ="Its a lab course :\n";
       courseDetails += "Department :"+getDepartment()+"\n";
       courseDetails += "Course Number :"+getCourseNumber()+"\n";
       courseDetails += "Course Cost :"+getCourseCost()+"\n";
       courseDetails += "Course credits :"+getCourseCredits()+"\n";
       return courseDetails;
   }
  
   public boolean equals(LabCourse obj)
   {
       if (this == obj)
       return true;
       if (obj == null)
       return false;
       if (getClass() != obj.getClass())
       return false;
   if(obj.getDepartment().equals(getDepartment()) && obj.getCourseCredits()== getCourseCredits() && obj.getCourseNumber() == getCourseNumber()){
       return true;
   }else{
       return false;
   }
   }
}
------------------

Output: