Question

In java

Implement the class Book. It has the following instance variables: name, subject, year, maximumLoanPeriod, and loanPeoriod. The following methods should be included:
• Constructor(s), Accessors and Mutators as needed.
• public double computeFine() => calculates the fine due on this item
The fine is calculated as follows:
• If the loanPeriod <= maximumLoanPeriod, there is no fine on the book.
• If loanPeriod > maximumLoanPeriod
o If the subject of the book is "CS" the fine is 10.00 per day.
o If the subject of the book is any other subject area, the fine is SR 5.00
per day.
o If the year of the book is < 2015, there is a 20% reduction in the fine. o If the year of the book is > 2015, the fine is increased by 20%
• toString() method that show description of the object.
Read the information of the attached file books.txt. The first line is the number of books and followed be a book on each line. The book details is separated by “-” Save the file content into array then Print the following.
• the number of books whose subject area is "CS".
• the total fine on all books
• the book with the highest fine.
• the total number of books with no fine.

Notes:
- Use the given books.txt.

——-——————————-

the text is

4

Introduction to Programming - CS - 2016 - 5 - 10

Introduction to Databases - CS - 2012 - 6 - 3

Thermodynamics - Physics - 1999 - 10 - 15

Linear Algebra - Math - 2015 - 12 - 10

Answer 1

// Book.java : Java program to create and implement the class Book

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

public class Book {

       // data members

       private String name;

       private String subject;

       private int year;

       private int maximumLoanPeriod;

       private int loanPeriod;

      

       // default constructor

       public Book()

       {

             this("","",0,0,0);

       }

      

       // parameterized constructor

       public Book(String name, String subject, int year, int loanPeriod, int maximumLoanPeriod)

       {

             this.name = name;

             this.subject = subject;

             this.year = year;

             this.maximumLoanPeriod = maximumLoanPeriod;

             this.loanPeriod = loanPeriod;

       }

      

       // setters

       public void setName(String name)

       {

             this.name = name;

       }

      

       public void setSubject(String subject)

       {

             this.subject = subject;

       }

      

       public void setYear(int year)

       {

             this.year = year;

       }

      

       public void setMaximumLoanPeriod(int maximumLoanPeriod)

       {

             this.maximumLoanPeriod = maximumLoanPeriod;

       }

      

       public void setLoanPeriod(int loanPeriod)

       {

             this.loanPeriod = loanPeriod;

       }

      

       // getters

       public String getName()

       {

             return name;

       }

      

       public String getSubject()

       {

             return subject;

       }

      

       public int getYear()

       {

             return year;

       }

      

       public int getMaximumLoanPeriod()

       {

             return maximumLoanPeriod;

       }

      

       public int getLoanPeriod()

       {

             return loanPeriod;

       }

      

       // method to compute and return the fine

       public double computeFine()

       {

             double fine = 0;

             if(loanPeriod > maximumLoanPeriod)

             {

                    if(subject.equalsIgnoreCase("CS"))

                           fine = (loanPeriod-maximumLoanPeriod)*10;

                    else

                           fine = (loanPeriod-maximumLoanPeriod)*5;

                   

                    if(year < 2015)

                    {

                           fine -= 0.2*fine;

                    }else if(year > 2015)

                    {

                           fine += 0.2*fine;

                    }

             }

                   

             return fine;

       }

      

       // toString method

       public String toString()

       {

             return("Name : "+name+" Subject : "+subject+" Year : "+year+" Loan Period : "+loanPeriod+" Maximum LoanPeriod : "+maximumLoanPeriod);

       }

      

      

       public static void main(String[] args) throws FileNotFoundException {

      

             Scanner fileScan = new Scanner(new File("books.txt")); // open the file, provide full path to file

             int numBooks;

             Book books[];

             String line;

            

             numBooks = fileScan.nextInt(); // read the number of books

             fileScan.nextLine(); // ignore the '\n' at the end

             books = new Book[numBooks];

             int i=0;

             // loop to read till the end of file

             while(fileScan.hasNextLine())

             {

                    line = fileScan.nextLine(); // read the line

                    // The format of the record : name-subject-year-loanPeriod-maximumLoanPeriod

                    String fields[] = line.split("-");// split the read line using "-" as the delimiter

                    // store the book read in the array

                    books[i] = new Book(fields[0],fields[1],Integer.parseInt(fields[2]),Integer.parseInt(fields[3]),Integer.parseInt(fields[4]));

                    i++;

             }

            

             fileScan.close(); // close the file

            

             int csBooks = 0;

             double totalFine = 0;

             int highestFineBook = -1;

             double highestFine = 0;

             int noFineBooks = 0;

            

             // loop to calculate the statistics

             for(i=0;i<numBooks;i++)

             {

                    if(books[i].getSubject().equalsIgnoreCase("CS"))

                           csBooks++;

                    double fine = books[i].computeFine();

                    if(fine == 0)

                           noFineBooks++;

                    else

                    {

                           if(fine > highestFine)

                           {

                                 highestFine = fine;

                                 highestFineBook = i;

                           }

                    }

                   

                    totalFine += fine;

             }

            

             // output the statistics

             System.out.println("The number of books whose subject area is CS : "+csBooks);

             System.out.printf("Total fine on all books : SR %.2f",totalFine);

             if(highestFineBook != -1)

             {

                    System.out.printf("\nBook with the highest fine of SR : %.2f\n",highestFine);

                    System.out.println(books[highestFineBook]);

             }else

                    System.out.println("No books with fine");

            

             System.out.println("Total number of books with no fine : "+noFineBooks);

            

       }

}

//end of program

Output:

Input file:

Output: