Question

(To be written in Java code)

Create a class named CollegeCourse that includes the following data fields:

• dept (String) - holds the department (for example, ENG)
• id (int) - the course number (for example, 101)
• credits (double) - the credits (for example, 3)
• price (double) - the fee for the course (for example, $360).

All of the fields are required as arguments to the constructor, except for the fee, which is calculated at $120 per credit hour. Include a display() method that displays the course data. For example, if dept is 'SE', id is 225, and credits is 3, the output from display() should be:

SE225
Non-lab course
3.0 credits
Total fee is $360.0

Create a subclass named LabCourse that adds $50 to the course fee. Override the parent class display() method to indicate that the course is a lab course and to display all the data. For example, if dept is 'BIO', id is 201, and credits is 4, the output from display() should be:

BIO201
Lab course
4.0 credits
Lab fee is $50
Total fee is $530.0

Write an application named UseCourse that prompts the user for course information. If the user enters a class in any of the following departments, create a LabCourse: BIO, CHM, CIS, or PHY. If the user enters any other department, create a CollegeCourse that does not include the lab fee. Then display the course data.

GIven code:

// CollegeCourse.java
import java.util.*;
public class CollegeCourse
{
// attributes

// constructor

// display()

}

//LabCourse.java
import java.util.*;
public class LabCourse
{
// attributes

// constructor

// override display()
  
}

//UseCourse.java
import java.util.*;
public class UseCourse
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
String dept, inStr;
String[] labCourses = {"BIO", "CHM", "CIS", "PHY"};
int id, credits;
int found = 0;
int x;
  
// your code here

  
}
}

Answer 1

CollegeCourse.java :

// CollegeCourse.java
import java.util.*;//import package
//Java class

public class CollegeCourse {
// attributes
   protected String dept;
   protected int id;
   protected double credits;
   protected double price;

// constructor
   public CollegeCourse(String d, int i, double c) {
       this.dept = d;
       this.id = i;
       this.credits = c;
       this.price = this.credits * 120;
   }

// display()
   public void display() {
       System.out.println(this.dept + "" + this.id);
       System.out.println("Non-lab course");
       System.out.println(this.credits + " credits");
       System.out.println("Total fee is $" + this.price);
   }

}

*****************************

LabCourse.java :

//LabCourse.java
import java.util.*;

public class LabCourse extends CollegeCourse {
// attributes
   private int labfee;

// constructor
   public LabCourse(String d, int i, double c, int lf) {
       // calling base class constructor
       super(d, i, c);
       this.labfee = lf;// set lab fee
   }

// override display()
   @Override
   public void display() {
       System.out.println(this.dept + "" + this.id);
       System.out.println("Lab course");
       System.out.println(this.credits + " credits");
       System.out.println("Lab fee is $" + this.labfee);
       System.out.println("Total fee is $" + (this.price + this.labfee));
   }

}

***************************

UseCourse.java :

//UseCourse.java
import java.util.*;

//java class
public class UseCourse {
   // main method
   public static void main(String[] args) {
       // creating object of Scanner class
       Scanner input = new Scanner(System.in);
       String dept, inStr;
       String[] labCourses = { "BIO", "CHM", "CIS", "PHY" };
       int id, credits;
       int found = 0;
       int x;
       // asking user course
       System.out.print("Enter course : ");
       dept = input.nextLine();// reading input
       // asking user course id
       System.out.print("Enter course id : ");
       id = input.nextInt();// reading course id
       // asking user credits
       System.out.print("Enter course credits : ");
       credits = input.nextInt();// reading course credits
       // checking course in labCourses
       for (x = 0; x < labCourses.length; x++) {
           // checking course is whether lab course or not
           if (labCourses[x].equals(dept)) {
               // if course is lab course then
               found = 1;// set found
           }
       }
       // checking value of found
       if (found == 1) {
           // if value of found is 1 then
           // this means course is lab course
           // create object of LabCourse
           LabCourse lc = new LabCourse(dept, id, credits, 50);
           // call method to display object details
           lc.display();
       } else {
           // if not a lab course then create a object of CollegeCourse
           CollegeCourse cc = new CollegeCourse(dept, id, credits);
           // call method to display object details
           cc.display();
       }

   }
}
==============================

Screen 1 :For non lab course

Debug Shell Console <terminated> UseCourse [Java Application] C:\Program FilesJava\jdk1.8.0_181\bin\javaw.exe (19-Oct-2019, 9:17:1 Enter course BIO Enter course id 201 Enter course credits: 4 BI0201 Lab course 4.0 credits Lab fee is $50 Total fee is $530.0

Screen 2 :For lab course

Console Debug Shell <terminated> UseCourse [Java Application] C:\Program FilesJava\jdk1.8.0_181\bin\javaw.exe (19-Oct-2019, 9:19:3 Enter course SE Enter course id 225 Enter course credits 3 SE225 Non-lab course 3.0 credits Total fee is $360.0