import java.util.ArrayList; import java.util.HashMap;

// Book class class Book { private String title; private String author; private boolean isIssued;

public Book(String title, String author) {
    this.title = title;
    this.author = author;
    this.isIssued = false;
}

public String getTitle() {
    return title;
}

public String getAuthor() {
    return author;
}

public boolean isIssued() {
    return isIssued;
}

public void issueBook() {
    this.isIssued = true;
}

public void returnBook() {
    this.isIssued = false;
}

}

// Member class class Member { private String name; private int memberId;

public Member(String name, int memberId) {
    this.name = name;
    this.memberId = memberId;
}

public String getName() {
    return name;
}

public int getMemberId() {
    return memberId;
}

}

// Library class class Library { private ArrayList books; private HashMap<Book, Member> issuedBooks;

public Library() {
    this.books = new ArrayList<>();
    this.issuedBooks = new HashMap<>();
}

// Add a new book to the library
public void addBook(String title, String author) {
    Book newBook = new Book(title, author);
    books.add(newBook);
    System.out.println("Book added: " + title + " by " + author);
}

// Issue a book to a member
public void issueBook(String title, Member member) {
    for (Book book : books) {
        if (book.getTitle().equalsIgnoreCase(title)) {
            if (!book.isIssued()) {
                book.issueBook();
                issuedBooks.put(book, member);
                System.out.println("Book issued: " + title + " to " + member.getName());
                return;
            } else {
                System.out.println("Book is already issued to someone else.");
                return;
            }
        }
    }
    System.out.println("Book not found in the library.");
}

// Return a book from a member
public void returnBook(String title) {
    for (Book book : books) {
        if (book.getTitle().equalsIgnoreCase(title)) {
            if (book.isIssued()) {
                book.returnBook();
                Member member = issuedBooks.remove(book);
                System.out.println("Book returned: " + title + " by " + member.getName());
                return;
            } else {
                System.out.println("This book was not issued.");
                return;
            }
        }
    }
    System.out.println("Book not found in the library.");
}

// Show issued books and their respective members
public void showIssuedBooks() {
    if (issuedBooks.isEmpty()) {
        System.out.println("No books are currently issued.");
    } else {
        for (HashMap.Entry<Book, Member> entry : issuedBooks.entrySet()) {
            System.out.println("Book: " + entry.getKey().getTitle() + " is issued to " + entry.getValue().getName());
        }
    }
}

}

// Main class for testing public class Main { public static void main(String[] args) { Library library = new Library();

    // Adding books to the library
    library.addBook("To Kill a Mockingbird", "Harper Lee");
    library.addBook("1984", "George Orwell");
    
    // Creating members
    Member member1 = new Member("Alice", 1);
    Member member2 = new Member("Bob", 2);
    
    // Issue books to members
    library.issueBook("1984", member1);
    library.issueBook("To Kill a Mockingbird", member2);
    
    // Try to issue an already issued book
    library.issueBook("1984", member2);
    
    // Show issued books
    library.showIssuedBooks();
    
    // Return a book
    library.returnBook("1984");
    
    // Show issued books after return
    library.showIssuedBooks();
}

}