Main.java

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {

        // Create a library object
        Library library = new Library();

        // Create customers using constructors
        Customer customer1 =
                new Customer("C001", "Anja", "Asceric");

        Customer customer2 =
                new Customer("C002", "John", "Smith");

        // Add customers to the library
        library.addCustomer(customer1);
        library.addCustomer(customer2);

        // Create books
        Book book1 =
                new Book("B001", "Harry Potter", "J.K. Rowling");

        Book book2 =
                new Book("B002", "The Hobbit", "J.R.R. Tolkien");

        // Add books to the library collection
        library.addBook(book1);
        library.addBook(book2);

        // Check the initial availability of a book
        System.out.println("*Book Availability*");
        System.out.println(book1.getTitle() + ": "
                + book1.isAvailable());

        // Borrow the book and update its status
        book1.borrowBook();

        System.out.println("After borrowing:");
        System.out.println(book1.getTitle() + ": "
                + book1.isAvailable());

        // Return the book and make it available again
        book1.returnBook();

        System.out.println("After returning:");
        System.out.println(book1.getTitle() + ": "
                + book1.isAvailable());

        // Create memberships with different benefits
        StandardMembership standardMembership =
                new StandardMembership(
                        "S001",
                        customer1,
                        "2025-06-01");

        PremiumMembership premiumMembership =
                new PremiumMembership(
                        "P001",
                        customer2,
                        "2025-06-01");

        FamilyMembership familyMembership =
                new FamilyMembership(
                        "F001",
                        customer1,
                        "2025-06-01");

        // Add authorized family members
        familyMembership.addFamilyMember("Mark Smith");
        familyMembership.addFamilyMember("Sarah Smith");

        // Verify whether a person is authorized under the family membership
        System.out.println(
                familyMembership.checkAuthorization("Sarah Smith"));


        // Store different membership types in one collection
        ArrayList<Membership> memberships =
                new ArrayList<>();

        memberships.add(standardMembership);
        memberships.add(premiumMembership);
        memberships.add(familyMembership);

        // Demonstrate polymorphism by calling the same methods on different membership objects
        System.out.println();
        System.out.println("*Membership Information*");

        for (Membership membership : memberships) {

            System.out.println(
                    membership.getClass().getSimpleName());

            System.out.println(
                    "Borrow Limit: "
                            + membership.getBorrowLimit());

            System.out.println(
                    "Membership Fee: $"
                            + membership.getMembershipFee());

            System.out.println();
        }
    }
}