// Part 1

public class Book {
    private String title;
    private int id;
    private static int nextId = 1;
    public static int bookCount = 0;

    public Book(String title) {
        this.title = title;
        this.id = nextId;
        nextId++;
        bookCount++;
    }

    // Getter and setter for title and id
    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String toString() {
        return this.id + " " + this.title;
    }

    public static void setNextId(int id) {
        Book.nextId = id;
    }

    // Other fields, constructors, and methods for the Book class
}

public class Novel extends Book {
    // fields, constructors, and methods for the Novel class
    public Novel(String title) {
        super(title);
    }
}

public class Textbook extends Book {
    // fields, constructors, and methods for the Textbook class
    public Textbook(String title) {
        super(title);
    }
}

public class BookTester {
    public static void main(String[] args) {
        Book.bookCount = 0;
        Book.setNextId(1);
        // Test the Book class
        Book book1 = new Book("White Fang");
        Book book2 = new Book("Uncle Tom's Cabin");
        Book book3 = new Book("Percy Jackson");
        Book book4 = new Book("Harry Potter");
        Book book5 = new Book("To Kill a Mockingbird");

        // Test the getTitle method
        String title1 = book1.getTitle();
        String title2 = book2.getTitle();
        String title3 = book3.getTitle();
        String title4 = book4.getTitle();
        String title5 = book5.getTitle();
        System.out.println(book1.toString());
        System.out.println(book2.toString());
        System.out.println(book3.toString());
        System.out.println(book4.toString());
        System.out.println(book5.toString());

        // Test the bookCount field
        System.out.println("Book count: " + book1.bookCount);
    }
}

BookTester.main(null);

1 White Fang
2 Uncle Tom's Cabin
3 Percy Jackson
4 Harry Potter
5 To Kill a Mockingbird
Book count: 5

// Part 2

import java.time.LocalDate;
import java.util.HashMap;
import java.util.Map;

class Book {
    private String title;
    private String id;
    private LocalDate date;
    private int checkoutCount;

    public static int bookCount = 0;

    public Book(String title) {
        this.title = title;
        this.id = generateUniqueId();
        this.date = LocalDate.now();
        bookCount++;
    }

    public String getTitle() {
        return title;
    }

    public String getId() {
        return id;
    }

    public LocalDate getDate() {
        return date;
    }

    public int getCheckoutCount() {
        return checkoutCount;
    }

    public void checkout() {
        checkoutCount++;
    }

    public boolean shouldBeRemoved() {
        return checkoutCount >= 3;
    }

    public static String generateUniqueId() {
        return String.valueOf(System.currentTimeMillis());
    }

    public int getShelfLife() {
        return LocalDate.now().compareTo(date);
    }
}

class Novel extends Book {
    private String author;
    private int numCheckouts = 0;
    private Map<Integer, Integer> checkoutHistory = new HashMap<>();
    private int numCheckoutsToExpire = 5;

    public Novel(String title, String author) {
        super(title);
        this.author = author;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public void checkout() {
        super.checkout();
        numCheckouts++;
        checkoutHistory.put(numCheckouts, getShelfLife());
    }

    public boolean shouldBeRemoved() {
        int sum = 0;
        int count = 0;
        for (int i = 1; i <= numCheckouts; i++) {
            if (checkoutHistory.containsKey(i)) {
                sum += checkoutHistory.get(i);
                count++;
            }
        }
        int averageShelfLife = sum / count;
        return numCheckouts >= numCheckoutsToExpire && averageShelfLife < 30;
    }
}

class Textbook extends Book {
    private String publisher;
    private int shelfLife = 365;

    public Textbook(String title, String publisher) {
        super(title);
        this.publisher = publisher;
    }

    public String getPublisher() {
        return publisher;
    }

    public void SetPublisher(String publisher) {
        this.publisher = publisher;
    }

    public int getShelfLife() {
        return shelfLife;
    }
}

public class BookTester {
    public static void main(String[] args) {
        Novel novel = new Novel("The Great Gatsby", "F. Scott Fitzgerald");
        Textbook textbook = new Textbook("Introduction to Java", "Pearson");

        System.out.println("Novel title: " + novel.getTitle());
        System.out.println("Novel author: " + novel.getAuthor());
        System.out.println("Textbook title: " + textbook.getTitle());
        System.out.println("Textbook publisher: " + textbook.getPublisher());

        novel.checkout();
        novel.checkout();
        novel.checkout();
        textbook.checkout();
        textbook.checkout();

        System.out.println("Novel shelf life: " + novel.getShelfLife());
        System.out.println("Textbook shelf life: " + textbook.getShelfLife());

        System.out.println("Novel should be removed: " + novel.shouldBeRemoved());
        System.out.println("Textbook should be removed: " + textbook.shouldBeRemoved());
    }
}

BookTester.main(null);

Novel title: The Great Gatsby
Novel author: F. Scott Fitzgerald
Textbook title: Introduction to Java
Textbook publisher: Pearson
Novel shelf life: 0
Textbook shelf life: 365
Novel should be removed: false
Textbook should be removed: false