// Defines a class called "Book" that represents a book with a title and an ID
public class Book {
private String title;
private int id;
private static int bookCount = 0;
// One-argument constructor for title
// The ID is automatically assigned when a new book object is created, and it is incremented for each new book created
public Book(String title) {
this.title = title;
this.id = ++Book.bookCount;
}
// Getter for BookCount
//static variable called "bookCount", which keeps track of the total number of books created
public static int getBookCount() {
return Book.bookCount;
}
// Override toString() method to return title
@Override
public String toString() {
return this.title;
}
// Tester Method
// tester method called "main()" which creates two book objects, prints out their IDs and titles, also prints out the total book in library as well
public static void main(String[] args) {
Book book1 = new Book("Boy With The Striped Pajamas");
Book book2 = new Book("Refugee");
System.out.println("Book 1 ID: " + book1.id);
System.out.println("Book 1 Title: " + book1.toString());
System.out.println("Book 2 ID: " + book2.id);
System.out.println("Book 2 Title: " + book2.toString());
System.out.println("Total books in library: " + Book.getBookCount());
}
}
//Executes all code within book class to work
Book.main(null);
// Part 2
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
public class Book {
//These are where the instance variables are created, fulfilling part 2
private String title;
private LocalDate publicationDate;
private int shelfLife;
public Book(String title, LocalDate publicationDate) {
this.title = title;
this.publicationDate = publicationDate;
this.shelfLife = calculateShelfLife();
}
//This is where we calculate the shelf Life of a book
private int calculateShelfLife() {
LocalDate today = LocalDate.now();
long daysSincePublication = ChronoUnit.DAYS.between(publicationDate, today);
return (int)daysSincePublication;
}
public int getShelfLife() {
return shelfLife;
}
//This is where a boolean method (true/false) is created to determine whether or not the book should come off the shelf and in this situation it comes off the shelf if the shelfLife is greater than or equal to 365
public boolean shouldRemoveFromShelf() {
return shelfLife >= 365;
}
}
//This is where part 1 is fulfilled, as the novel and textbook class extend from Book and are created here
public class Novel extends Book {
private String author;
public Novel(String title, LocalDate publicationDate, String author) {
super(title, publicationDate);
this.author = author;
}
public String getAuthor() {
return author;
}
}
//This is where part 1 is fulfilled, as the novel and textbook class extend from Book and are created here
public class Textbook extends Book {
private String publishingCompany;
public Textbook(String title, LocalDate publicationDate, String publishingCompany) {
super(title, publicationDate);
this.publishingCompany = publishingCompany;
}
public String getPublishingCompany() {
return publishingCompany;
}
}
//This is where the Book Tester is (part 5, tests everything in parts 1-3)
public class BookTester {
public static void main(String[] args) {
LocalDate publicationDate = LocalDate.of(2010, 1, 1);
Novel novel = new Novel("Refugee", publicationDate, "Alan Gratz");
System.out.println(novel.getAuthor());
System.out.println(novel.getShelfLife());
System.out.println(novel.shouldRemoveFromShelf());
Textbook textbook = new Textbook("Integrated 3A", publicationDate, "Pearson");
System.out.println(textbook.getPublishingCompany());
System.out.println(textbook.getShelfLife());
System.out.println(textbook.shouldRemoveFromShelf());
}
}
BookTester.main(null);
import java.util.ArrayList;
// Tester Method
public class BookShelf {
public static void main(String[] args) throws InterruptedException {
// Construct some books and add them to a library
ArrayList<Book> library = new ArrayList<>();
library.add(new TextBook("Diary Of A Wimpy Kid"));
library.add(new Novel("Refugee"));
library.add(new Novel("Boy With The Striped Pajamas"));
// Sleep in java stops
Thread.sleep(5000);
// Check which books need to be removed from the shelf
for (Book book : library) {
if (book.isExpired()) {
System.out.println(book.getTitle() + " - Expired");
} else {
System.out.println(book.getTitle() + " - Available");
}
}
}
}
public abstract class Book {
private String title;
private long constructionTime;
public Book(String title) {
this.title = title;
this.constructionTime = System.nanoTime();
}
public String getTitle() {
return title;
}
public long getConstructionTime() {
return constructionTime;
}
// Returns Current Shelf Life
public long getShelfLife() {
long currentTime = System.nanoTime();
long shelfLife = currentTime - constructionTime;
return shelfLife;
}
public abstract boolean isExpired();
}
// Expireation date for shelf life is 3000 nanoseconds or 3 yrs
public class TextBook extends Book {
private static final long SHELF_LIFE = 3000;
public TextBook(String title) {
super(title);
}
public boolean isExpired() {
long shelfLife = getShelfLife();
return shelfLife > SHELF_LIFE;
}
}
// Computed Shelf Life extends main
public class Novel extends Book {
public Novel(String title) {
super(title);
}
public void addReturnStamp() {
returnStamps++;
}
// This method detrmiens when the book needs to come off the shelf or not
public boolean isExpired() {
long shelfLife = getShelfLife();
long shelfLifeLeft = SHELF_LIFE - shelfLife;
if (shelfLifeLeft <= 0) {
return true;
} else {
long renewalThreshold = 3 * 365 * 24 * 60 * 60 * 1000000000L; // 3 years in nanoseconds
}
}
}
BookShelf.main(null);