Оцените первый большой код. Для вас может и не большой)))

public class Runner {

    public static void main(String[] args) {
        Book book = new Book("Clean code", "Robert Martin", 1000, false);
        BookHelper.printLinesCount(book);
        BookHelper.printDescription(book);
    }

    public static class BookHelper {

        private final static int AVG_LINES_PER_PAGE = 40;
        private final static String LINE_COUNT_PATTERN = "\"%s\" by Author %s has approximately %d lines\n";
        private final static String DESCRIPTION_PATTERN = "\"%s\" by Author %s %s and has %d pages\n";

        public static void printLinesCount(Book book) {
            System.out.printf(LINE_COUNT_PATTERN,
                    book.name(),
                    book.author(),
                    BookHelper.countLines(book));
        }

        public static void printDescription(Book book) {
            System.out.printf(DESCRIPTION_PATTERN,
                    book.name(),
                    book.author(),
                    book.isFictional() ? "is fictional" : "is not fictional",
                    book.pagesCount()
            );
        }

        private static int countLines(Book book) {
            return AVG_LINES_PER_PAGE * book.pagesCount;
        }
    }

    public record Book(String name, String author, int pagesCount, boolean isFictional) {
        @Override
        public boolean equals(Object o) {
            if (!(o instanceof Book book)) return false;
            return pagesCount() == book.pagesCount() &&
                    isFictional() == book.isFictional() &&
                    Objects.equals(name(), book.name()) &&
                    Objects.equals(author(), book.author());
        }

        @Override
        public int hashCode() {
            return Objects.hash(name(), author(), pagesCount(), isFictional());
        }
    }
}