Pop Test

import java.util.*

Part 1

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

    public Book(String title) {
        this.title = title;
        this.id = ++bookCount;
    }
    public static int getBookCount() {
        return bookCount;
    }

    public String toString(){
        return ("Book title: '" + this.title + "'. Book ID: " + this.id);
    }

    public static void main(String args[]) {
        Book bookone = new Book("Learn Java");
        Book booktwo = new Book("CSA");

        System.out.println(bookone);
        System.out.println(booktwo);

        System.out.println(booktwo.getBookCount());
    }
}


Book.main(null);

Book title: 'Learn Java'. Book ID: 1
Book title: 'CSA'. Book ID: 2
2

Part 2

import java.time.LocalDateTime;
public class Book {
    public String title;
    public int id;
    public static int bookCount = 0;
    public static LocalDateTime entryTime;

    public Book() {
        this.title = null;
        this.id = 0;
    }

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

    public static int getBookCount() {
        return bookCount;
    }

    public String toString(){
        return ("Book title: '" + this.title + "'. Book ID: " + this.id);
    }

    public static void main(String[] args) {
        Book book1 = new Book("book1");
        Book book2 = new Book("book2");

        System.out.println(book1);
        System.out.println(book2);
    }
}


class Novel extends Book {
    private String author;
    
    Novel() {
        super();
    }

    Novel(String title, String author) {
        this.title = title;
        this.author = author;
        this.id = ++bookCount;
    }

    public String getAuthor() {
        return this.author;
    }

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

    @Override
    public String toString() {
        return ("Book title: '" + this.title + "'. Book ID: " + this.id + ". Author: " + this.author);
    }
}

class Textbook extends Book {
    public String publisher;

    Textbook() {
        super();
    }

    Textbook(String title, String publisher) {
        this.title = title;
        this.publisher = publisher;
        this.id = ++bookCount;
    }

    public String getPublisher() {
        return this.publisher;
    }

    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }
    @Override
    public String toString() {
        return ("Book title: '" + this.title + "'. Book ID: " + this.id + ". Publisher: " + this.publisher);
    }

}

class Tester {
    public static void main(String args[]) {
        Book bookone = new Book("CSA Hacks");
        Novel booktwo = new Novel("The Great Gatsby","F Scott Fitzgerald");
        Textbook bookthree = new Textbook("American Pageant", "Publisher Company Inc.");

        System.out.println(bookone);
        System.out.println(booktwo);
        System.out.println(bookthree);

        System.out.println(bookone.getBookCount());
    }
}

Tester.main(null);

Book title: 'CSA Hacks'. Book ID: 1
Book title: 'The Great Gatsby'. Book ID: 2. Author: F Scott Fitzgerald
Book title: 'American Pageant'. Book ID: 3. Publisher: Publisher Company Inc.
3

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
class Book {
    private String title;
    private LocalDateTime entryTime;
    public Book(String title) {
        this.title = title;
        this.entryTime = LocalDateTime.now();
    }
    public String getTitle() {
        return title;
    }
}
class Novel extends Book {
    private String author;
    private int returnStamps = 0;
    public Novel(String title, String author) {
        super(title);
    }
    public int getReturnStamps() {
        return returnStamps;
    }
    public void addReturnStamp() {
        returnStamps++;
    }
    public boolean isExpired() {
        return returnStamps >= 3;
    }
}
class TextBook extends Book {
    private String publisher;
    public TextBook(String title, String publisher) {
        super(title);
    }
    public boolean isExpired() {
        return getShelfLife() >= 3_000_000L;
    }
}
public class LibrarySimulation {
    private static final Random RANDOM = new Random();
    public static void main(String[] args) throws InterruptedException {
        List<Book> books = new ArrayList<>();
        books.add(new Novel("Pride and Prejudice", "Jane Austen"));
        books.add(new Novel("To Kill a Mockingbird", "Harper Lee"));
        books.add(new TextBook("Introduction to Computer Science", "MIT Press"));
        books.add(new TextBook("Calculus", "Pearson"));
        System.out.println("Starting simulation...");
        for (int i = 0; i < 4; i++) {
            System.out.println("Day " + (i + 1) + ":");
            for (Book book : books) {
                if (book instanceof Novel) {
                    Novel novel = (Novel) book;
                    if (!novel.isExpired()) {
                        if (RANDOM.nextDouble() < 0.05) {
                            novel.addReturnStamp();
                            System.out.println(novel.getTitle() + " got a return stamp.");
                        } else {
                            System.out.println(novel.getTitle() + " is still on the shelf.");
                        }
                    } else {
                        System.out.println(novel.getTitle() + " has expired and needs to be removed.");
                    }
                } else if (book instanceof TextBook) {
                    TextBook textbook = (TextBook) book;
                    if (!textbook.isExpired()) {
                        System.out.println(textbook.getTitle() + " is still on the shelf.");
                    } else {
                        System.out.println(textbook.getTitle() + " has expired and needs to be removed.");
                    }
                }
            }
            System.out.println();
            Thread.sleep(1000);
        }
        System.out.println("Simulation ended.");
    }
}
LibrarySimulation.main(null)

|   
|   class TextBook extends Book {
|       private String publisher;
|       public TextBook(String title, String publisher) {
|           super(title);
|       }
|       public boolean isExpired() {
|           return getShelfLife() >= 3_000_000L;
|       }
|   }
Unresolved dependencies:
   - method getShelfLife()