public class Book { static int totalNoOfBook; String title; String author; String isbn; boolean isBorrowed; static { totalNoOfBook = 0; } { // Object Init totalNoOfBook++; } Book(String isbn, String author, String title) { this.isbn = isbn; this.author = author; this.title = title; } Book(String isbn) { this(isbn, "Unknown", "Unknown"); } static int getTotalNoOfBooks() { return totalNoOfBook; } void borrowBook() { if (isBorrowed) { System.out.println("Book is already borrowed"); } else { this.isBorrowed = true; System.out.println("Enjoy " + this.title); } } void returnBook() { if (isBorrowed) { this.isBorrowed = false; System.out.println("Hope you enjoyed the book"); } else { System.out.println("This book is already in library"); } } public static void main(String[] args) { Book designOfThings = new Book("1", "Author", "Design"); Book myBook = new Book("2"); System.out.println(Book.getTotalNoOfBooks()); designOfThings.borrowBook(); myBook.borrowBook(); designOfThings.borrowBook(); designOfThings.returnBook(); designOfThings.returnBook(); } }