I\'m creating a Library simulation in Java. My current code has a Book class tha

ID: 3811498 • Letter: I

Question

I'm creating a Library simulation in Java. My current code has a Book class that stores the book information, BookCopy class that handles copies of the book, LibraryCard class that handles the checkout, list of books checked out, due dates, etc. I need to make the following changes to the program.

Create a LibraryMaterial class. Each LibraryMaterial consists of a title and an ISBN.* LibraryMaterialCopy has a library card and due date, they DO NOT contain a LibraryMaterial. Instead, declare LibraryMaterialCopy an abstract class.

What sort of LibraryMaterials does the library have?

* Books. These have the same basics as a LibraryMaterial, plus an author.

* DVDs are NOT Books (for starters, they don't have authors). They areLibraryMaterials, and they have a "main actor" .

For each type of LibraryMaterial, there is also a copy class -- Book and BookCopy, DVD and DVDCopy.

LibraryMaterialCopy is an abstract class. The reason behind this is because there's no such thing as a LibraryMaterialCopy; it must be either a Book or a DVD. So LibraryMaterial is in charge of all basic functionality for checking in and out, but is not associated with a specific LibraryMaterial at the superclass level.

The abstract LibraryMaterialCopy class should have an abstract method, getLibraryMaterial() which will return either a Book or a DVD, depending on the subclass. You may also have abstract getTitle() and getISBN().

In addition to all of the standard methods needed for accessing data and checking out / checking in / renewing / etc., each class should have a print method.

LibraryMaterials (and all superclasses) should print all of the basic information: ISBN, title and (if any): author, main actor.

LibraryMaterialCopy should print LibraryCard checked out to and dueDate.
BookCopy and DVDCopy should print all of the details of the Book/DVD plus the LibraryCard and dueDate.
Print to standard output. The only time that you should do that in a class is within a print() method.

To make matters more complicated, the library has set the following rules for checking out materials:

1. Overdue fines for books are $.10 per day, $1.00 per day for DVDs. An abstract getFinePerDay() method.

2. Books are checked out for three weeks. DVDs are checked out for only two weeks. An abstract getBorrowingPeriod() method.

3. Books are renewable for two weeks. DVDs may not be renewed.

The LibraryCard class should not have any additional functionalities, but will need to be changed to accommodate the changes to the library materials. Please think carefully about the inheritance hierarchy and polymorphism .

My Code

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

//Book class stores the title, author and ISBN of the book
public class Book {

private String Title;
private String Author;

//Using String for ISBN instead of a int because it is 13 digits long
private String Isbn;

//Constructor
public Book(String title, String author, String isbn)
{
Title = title;
Author = author;
Isbn = isbn;
}

//No need for setters because a book's title, author and ISBN will never change

//Getters
public String getTitle()
{
return Title;
}

public String getAuthor()
{
return Author;
}

public String getIsbn()
{
return Isbn;
}
}

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

import java.time.LocalDate;

//BookCopy class stores the current copy of the book that is being checked in or out and the current library card that is being used.
public class BookCopy {

private Book Book;
private LibraryCard LibraryCard;
private LocalDate dueDate;
//Constructor
//If book is not checked out, pass null for library card
public BookCopy(Book book, LibraryCard libraryCard)
{
Book = book;
LibraryCard = libraryCard;
dueDate = null;
}

//Getters and setters
public Book getBook()
{
return Book;
}

public LibraryCard getLibraryCard()
{
return LibraryCard;
}

public LocalDate getDueDate()
{
return dueDate;
}

public void setDueDate(LocalDate dueDate)
{
this.dueDate = dueDate;
}

//We don't need setter for Book as a book's copy won't change
//But we need setter for LibraryCard, as multiple people can borrow
//a single book copy
public void setLibraryCard(LibraryCard libraryCard)
{
LibraryCard = libraryCard;
}
}

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

//LibraryCard class stores the library card holder's ID, name and a list of the books that are currently checked out on the card
//Prints the user and checkout information onto the console
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.util.*;

public class LibraryCard {

private int ID;
private String CardHolderName;
private double charges;

//List that stores the books that are checked out on the card
private ArrayList<BookCopy> BookCopyList = new ArrayList<>();

//Constructor
public LibraryCard(int id, String cardHolderName, BookCopy bookCopy, double charges)
{
ID = id;
CardHolderName = cardHolderName;
BookCopyList.add(bookCopy);
this.charges = charges;
}

//Getters and Setters
//We don't need setter for id as it wont change
public int getId()
{
return ID;
}

public String getCardHolderName()
{
return CardHolderName;
}

public void setCardHolderName(String cardHolderName)
{
CardHolderName = cardHolderName;
}

public double getCharges()
{
return charges;
}

public void addBookCopy(BookCopy bookCopy)
{
addBookCopy(bookCopy, LocalDate.now());
}

//Methods to Add and remove bookcopies to LibraryCard
public void addBookCopy(BookCopy bookCopy, LocalDate checkoutDate)
{
BookCopyList.add(bookCopy);
//Adding libraryCard to bookcopy
bookCopy.setLibraryCard(this);

//Set due date for 3 weeks later
bookCopy.setDueDate(checkoutDate.plusWeeks(3));

//Printing on screen that the book has been checked out
System.out.println("CheckOut Information: ");
System.out.println("Borrower Name: "+this.CardHolderName);
System.out.println("Book Title: "+bookCopy.getBook().getTitle());
System.out.println("Author Name: "+bookCopy.getBook().getAuthor());
System.out.println("ISBN No.: "+bookCopy.getBook().getIsbn());
System.out.println("Due date: " + bookCopy.getDueDate());
System.out.println("");
}

public boolean removeBookCopy(BookCopy bookCopy)
{
return removeBookCopy(bookCopy, LocalDate.now());
}

//Method returns true if bookCopy was successfully removed from LibraryCard
public boolean removeBookCopy(BookCopy bookCopy, LocalDate returnDate)
{
if(BookCopyList.contains(bookCopy))
{
BookCopyList.remove(bookCopy);

//Checking if due date is of later time, and we need to subtract
//charges
if (bookCopy.getDueDate().isBefore(returnDate))
{
long noOfDays = ChronoUnit.DAYS.between(bookCopy.getDueDate(), returnDate);
System.out.println("Deduting balance for " + noOfDays + " Days.");
charges -= noOfDays * .10; //Have not figured out the right formatting for the output when displaying charges.
}

//Resetting librarycard to null as its checked in now
bookCopy.setLibraryCard(null);

//Resetting the due date
bookCopy.setDueDate(null);

System.out.println("Book Checkd In Successfully:");
System.out.println("Book Title: "+bookCopy.getBook().getTitle());
System.out.println("Charges: " + "$" + charges);
System.out.println("");
return true;
}

System.out.println("This book is not borrowed by "+this.CardHolderName);
System.out.println("");
return false;
}

//Renews books due date for 2 weeks more.
public void renewal(BookCopy bookCopy)
{
bookCopy.setDueDate(bookCopy.getDueDate().plusDays(14));
System.out.println("Renewal successful.");

// Printing on screen that the book has been checked out
System.out.println("Borrower Name: " + this.CardHolderName);
System.out.println("Book Title: " + bookCopy.getBook().getTitle());
System.out.println("Due date: " + bookCopy.getDueDate());
System.out.println("");
}

//Get the books which are overdue on a particular date
public void getListOfBooksDue(LocalDate date)
{
ArrayList<BookCopy> dueBooks = new ArrayList<>();
for (BookCopy b : BookCopyList) {
if (!b.getDueDate().isAfter(date)) {
dueBooks.add(b);
System.out.println("Book Title: " + b.getBook().getTitle());
}
}
}

//Return the books overdue on the calling date
public void getOverdueBooks()
{
getListOfBooksDue(LocalDate.now());
}

//For testing the above method
public void getOverdueBooks(LocalDate d) {
getListOfBooksDue(d);
}

//For testing the above method
public void getCheckedOutBooks()
{
ArrayList<BookCopy> CheckedOutList = new ArrayList<>(BookCopyList);

Collections.sort(CheckedOutList, new Comparator<BookCopy>() {
public int compare(BookCopy b1, BookCopy b2) {
return b1.getDueDate().compareTo(b2.getDueDate());
}
});
for (BookCopy b : CheckedOutList) {
System.out.println("Book Title: " + b.getBook().getTitle());
}

//Return CheckedOutList;
}
}

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

import java.time.LocalDate;

//Test program for the Book class, Library class and BookCopy class
public class Main {
public static void main (String[] args) throws java.lang.Exception
{
//List of Books and their bookCopies
Book Book1 = new Book("Diary of a Wimpy Kid # 11: Double Down", "Jeff Kinney", "9781419723445");
BookCopy BookCopy1a = new BookCopy(Book1, null);
BookCopy BookCopy1b = new BookCopy(Book1, null);

Book Book2 = new Book("A Man Called Ove: A Novel", "Fredrik Backman", "9781476738024");
BookCopy BookCopy2a = new BookCopy(Book2, null);
BookCopy BookCopy2b = new BookCopy(Book2, null);

Book Book3 = new Book("To Kill a Mockingbird", "Harper Lee", "9780446310789");
BookCopy BookCopy3a = new BookCopy(Book3, null);
BookCopy BookCopy3b = new BookCopy(Book3, null);

Book Book4 = new Book("A Dance with Dragons", "George R. R. Martin", "9780553801477");
BookCopy BookCopy4a = new BookCopy(Book4, null);
BookCopy BookCopy4b = new BookCopy(Book4, null);

Book Book5 = new Book("One Flew Over the Cuckoo's Nest", "Ken Kesey", "9780451163967");
BookCopy BookCopy5a = new BookCopy(Book5, null);
BookCopy BookCopy5b = new BookCopy(Book5, null);

Book Book6 = new Book("The Amber Spyglass: His Dark Materials", "Philip Pullman", "9780440418566");
BookCopy BookCopy6a = new BookCopy(Book6, null);
BookCopy BookCopy6b = new BookCopy(Book6, null);

Book Book7 = new Book("The Help", "Kathryn Stockett", "9780399155345");
BookCopy BookCopy7a = new BookCopy(Book7, null);
BookCopy BookCopy7b = new BookCopy(Book7, null);

Book Book8 = new Book("Of Mice and Men", "John Steinbeck", "9780140177398");
BookCopy BookCopy8a = new BookCopy(Book8, null);
BookCopy BookCopy8b = new BookCopy(Book8, null);

Book Book9 = new Book("Harry Potter and the Deathly Hallows", "J. K. Rowling", "9780545010221");
BookCopy BookCopy9a = new BookCopy(Book9, null);
BookCopy BookCopy9b = new BookCopy(Book9, null);

Book Book10 = new Book("A Thousand Splendid Suns", "Khaled Hosseini", "9781594489501");
BookCopy BookCopy10a = new BookCopy(Book10, null);
BookCopy BookCopy10b = new BookCopy(Book10, null);

//Library Cards
LibraryCard libraryCard1 = new LibraryCard(1, "Tony Stark", null, 0);
LibraryCard libraryCard2 = new LibraryCard(2, "Bruce Wayne", null, 0);
LibraryCard libraryCard3 = new LibraryCard(3, "Jon Snow", null, 0);

libraryCard1.addBookCopy(BookCopy10a, LocalDate.of(2017, 01, 15));
libraryCard1.addBookCopy(BookCopy6b, LocalDate.of(2017,01, 15));
libraryCard1.addBookCopy(BookCopy5a);

// Renew due date of book 6b
libraryCard1.renewal(BookCopy6b);

//This book has been borrowed by libraryCard1.
//It is returned after the due date, so the charges is added
libraryCard1.removeBookCopy(BookCopy10a);

//This book is returned before the due date, so the charges stay the same
libraryCard1.removeBookCopy(BookCopy5a);

libraryCard2.addBookCopy(BookCopy3b, LocalDate.of(2017, 05, 18));
libraryCard2.addBookCopy(BookCopy4a, LocalDate.of(2017, 05, 18));

//This book hasn't been borrowed by libraryCard3Holder
libraryCard3.removeBookCopy(BookCopy9b);

}
}

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

Output:

CheckOut Information:
Borrower Name: Tony Stark
Book Title: A Thousand Splendid Suns
Author Name: Khaled Hosseini
ISBN No.: 9781594489501
Due date: 2017-02-05

CheckOut Information:
Borrower Name: Tony Stark
Book Title: The Amber Spyglass: His Dark Materials
Author Name: Philip Pullman
ISBN No.: 9780440418566
Due date: 2017-02-05

CheckOut Information:
Borrower Name: Tony Stark
Book Title: One Flew Over the Cuckoo's Nest
Author Name: Ken Kesey
ISBN No.: 9780451163967
Due date: 2017-03-22

Renewal successful.
Borrower Name: Tony Stark
Book Title: The Amber Spyglass: His Dark Materials
Due date: 2017-02-19

Deduting balance for 24 Days.
Book Checkd In Successfully:
Book Title: A Thousand Splendid Suns
Charges: $-2.4000000000000004

Book Checkd In Successfully:
Book Title: One Flew Over the Cuckoo's Nest
Charges: $-2.4000000000000004

CheckOut Information:
Borrower Name: Bruce Wayne
Book Title: To Kill a Mockingbird
Author Name: Harper Lee
ISBN No.: 9780446310789
Due date: 2017-06-08

CheckOut Information:
Borrower Name: Bruce Wayne
Book Title: A Dance with Dragons
Author Name: George R. R. Martin
ISBN No.: 9780553801477
Due date: 2017-06-08

This book is not borrowed by Jon Snow

Explanation / Answer