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

class Member {
    private final String id;
    private final String name;
    private final List<Borrowing> borrowings = new ArrayList<>();

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

    public List<Borrowing> getBorrowings() {
        return borrowings;
    }
}

class Book {
    private final String isbn;
    private final String title;
    private final List<Borrowing> borrowings = new ArrayList<>();

    public Book(String isbn, String title) {
        this.isbn = isbn;
        this.title = title;
    }

    public List<Borrowing> getBorrowings() {
        return borrowings;
    }
}

class Borrowing {
    private Member member;
    private Book book;

    private Date borrowDate;
    private Date returnDate;

    public Borrowing(Member member, Book book, Date borrowDate, Date returnDate) {
        this.member = member;
        this.book = book;
        this.borrowDate = borrowDate;
        this.returnDate = returnDate;
    }

    public Member getMember() {
        return member;
    }

    public Book getBook() {
        return book;
    }

    public Date getBorrowDate() {
        return borrowDate;
    }

    public Date getReturnDate() {
        return returnDate;
    }
}

public class Example01 {
	public static void main(String args[]){
	}
}