Library.java

import java.util.ArrayList;
import java.util.List;

public class Library {
    private List<Book> books;
    private List<Member> members;

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

    public void addBook(Book book) {
        books.add(book);
    }

    public void addMember(Member member) {
        members.add(member);
    }

    public Book findBookByIsbn(String isbn) {
        for (Book book : books) {
            if (book.getIsbn().equals(isbn)) {
                return book;
            }
        }
        return null;
    }

    public Member findMemberById(String memberId) {
        for (Member member : members) {
            if (member.getMemberId().equals(memberId)) {
                return member;
            }
        }
        return null;
    }

    public void displayAvailableBooks() {
        System.out.println("Available Books:");
        for (Book book : books) {
            if (book.isAvailable()) {
                System.out.println(book);
            }
        }
    }

    public void displayMembers() {
        System.out.println("Library Members:");
        for (Member member : members) {
            System.out.println(member);
        }
    }
}