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). TheyareLibraryMaterials, 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 LibraryMaterialat 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. Theonlytime 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 maynotbe 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

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//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; } }

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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; } }

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//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 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 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 CheckedOutList = new ArrayList<>(BookCopyList);

Collections.sort(CheckedOutList, new Comparator() { 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; } }

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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);

} }

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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