private static List<Book> library = new ArrayList<>();
	
	static {
		library.add(new Book("0261102303", "Lord of the Rings"));
        library.add(new Book("0007441428", "Game of Thrones"));
        library.add(new Book("0747581088", "Harry Potter and the Half-Blood Prince"));
        library.add(new Book("1401248195", "Watchmen"));
        library.add(new Book("030788743X", "Ready player one"));
        library.add(new Book("843760494X", "Cien Años de Soledad"));
        library.add(new Book("0553804367", "A Briefer History of Time"));
	}