Trying to create a Library in Java 8 using the Date API.

BookCopy has an associated DueDate (which is null if the book is not checked out)

and LibraryCard has a non-negative balance, which is incurred if books are checked in past their due dates. The library charges $.10 per day per book.

Modify your checkOut method ( which I named removeBookCopy() ) to give the BookCopy a due date that is equal to three weeks from the day that the books are checked out.

Modify your checkIn method ( which I named addBookCopy() )to check if the book is overdue; if so, update the balance accordingly.

Note: although a real library application would use only the real date, for ease of testing and debugging, ALSO create an additional checkIn and checkOut method that takes a date as a parameter, so that you don't have to wait three weeks to test your code.

Also create the following LibraryCard methods:

- a renewal method which allows the cardholder to get a new due date for that book. Renewal periods are in two-week increments.

- a method which takes a date as a parameter and returns a list of books that are due on or before that date.

- a method that checks if any books are overdue. (Note: although in a real-world application, this would check for overdue books using today's date, ALSO create an additional method that takes a date as a parameter for ease of testing.)

- a method that returns a list of all the books checked out, sorted by due date. (You may use an array or an ArrayList -- we're not focusing on the specific data structures yet.)

This is my code so far.

//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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//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; //Constructor //If book is not checked out, pass null for library card public BookCopy(Book book, LibraryCard libraryCard) { Book = book; LibraryCard = libraryCard; } //Getters and setters public Book getBook() { return Book; } public LibraryCard getLibraryCard() { return LibraryCard; } //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.util.*;

public class LibraryCard {

private int ID; private String CardHolderName; //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) { ID = id; CardHolderName = cardHolderName; BookCopyList.add(bookCopy); } //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; } //Methods to Add and remove bookcopies to LibraryCard public void addBookCopy(BookCopy bookCopy) { BookCopyList.add(bookCopy); //Adding libraryCard to bookcopy bookCopy.setLibraryCard(this); //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(""); } //Method returns true if bookCopy was successfully removed from LibraryCard public boolean removeBookCopy(BookCopy bookCopy) { if(BookCopyList.contains(bookCopy)) { BookCopyList.remove(bookCopy); //resetting librarycard to null as its checked in now bookCopy.setLibraryCard(null); System.out.println("Book Checkd In Successfully:"); System.out.println("Book Title: "+bookCopy.getBook().getTitle()); System.out.println(""); return true; } System.out.println("This book is not borrowed by "+this.CardHolderName); System.out.println(""); return false; } }

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//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); LibraryCard libraryCard2 = new LibraryCard(2, "Bruce Wayne", null); LibraryCard libraryCard3 = new LibraryCard(3, "Jon Snow", null); libraryCard1.addBookCopy(BookCopy6a); libraryCard1.addBookCopy(BookCopy6b); libraryCard1.addBookCopy(BookCopy5a); libraryCard2.addBookCopy(BookCopy3b); libraryCard3.addBookCopy(BookCopy4a); //This book has been borrowed by libraryCard1Holder libraryCard1.removeBookCopy(BookCopy6a); //This book hasn't been borrowed by libraryCard3Holder libraryCard3.removeBookCopy(BookCopy9b); } }

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Output:

CheckOut Information: Borrower Name: Tony Stark Book Title: The Amber Spyglass: His Dark Materials Author Name: Philip Pullman ISBN No.: 9780440418566

CheckOut Information: Borrower Name: Tony Stark Book Title: The Amber Spyglass: His Dark Materials Author Name: Philip Pullman ISBN No.: 9780440418566

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

CheckOut Information: Borrower Name: Bruce Wayne Book Title: To Kill a Mockingbird Author Name: Harper Lee ISBN No.: 9780446310789

CheckOut Information: Borrower Name: Jon Snow Book Title: A Dance with Dragons Author Name: George R. R. Martin ISBN No.: 9780553801477

Book Checkd In Successfully: Book Title: The Amber Spyglass: His Dark Materials

This book is not borrowed by Jon Snow