1.Library

import java.util.ArrayList;

public class Library {
    public Library(String name) {
        this.name = name;
        this.Books = new ArrayList<Book>();
    }

    String name;
    ArrayList<Book> Books;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public ArrayList<Book> getBooks() {
        return Books;
    }

    public void setBooks(ArrayList<Book> Books) {
        this.Books = Books;
    }

    public void AddBook(Book book){
        this.Books.add(book);
    }

    public Book FindBookByAuthor(String author){
        return Books.stream()
                .filter((Book) -> Book.getAuthor().equals(author))
                .findFirst()
                .orElse(null);
    }

    public String BookInfo(Book book){
        return "Title: " + book.getTitle() + "\n" + "Author: "
        + book.getAuthor() + "\n" + "Publishing House: " + book.getPublishingHouse() + "\n"
                + "Date: " + book.getDate() + "\n" + "ISBN: " + book.getIsbn();
    }

    public void RemoveBook(Book book){
        if(!Books.contains(book)){
            return;
        }

        Books.remove(book);
    }
}