I'm completing this Java program assignment and I'm confused on how to start it. Book.java class is completed and I have provided that below. I really need some sort of assistance to start Patron.Java and Library.Java. Thank you.

______________________________________________________

Book.Java Class

public class Book { public static final int AVAILABLE = 1; public static final int UNAVAILABLE = 2; private String title; private String author; private String isbn; private int pages; private int year; private int status; private Patron patron; private Date due; /** * Constructs a book from the given values. * * @param title the book's title * @param author the book's author (or authors) * @param isbn international standard book number * @param year the book's year of publication * @param pages number of pages in the book */ public Book(String title, String author, String isbn, int year, int pages) { this.title = title; this.author = author; this.isbn = isbn; this.year = year; this.pages = pages; this.status = AVAILABLE; this.patron = null; this.due = null; } /** * @return the title */ public String getTitle() { return title; } /** * @return the author */ public String getAuthor() { return author; } /** * @return the isbn */ public String getIsbn() { return isbn; } /** * @return the pages */ public int getPages() { return pages; } /** * @return the year */ public int getYear() { return year; } /** * @return the status */ public int getStatus() { return status; } /** * @return the due date */ public Date getDue() { return due; } /** * @return the patron */ public Patron getPatron() { return patron; } /** * Checks the book in. */ public void checkin() { this.status = AVAILABLE; this.patron = null; this.due = null; } /** * Checks the book out. * * @param patron the patron checking the book out * @param due when the book is due for return */ public void checkout(Patron patron, Date due) { this.status = UNAVAILABLE; this.patron = patron; this.due = due; } /** * Compares this book to the specified object. * * @param other the object to compare this book against * @return true if the books have the same isbn */ public boolean equals(Object other) { boolean result = false; if (other instanceof Book) { Book book = (Book) other; result = this.isbn.equals(book.isbn); } else if (other instanceof String) { String str = (String) other; result = this.isbn.equals(str); } return result; } /** * @return the basic info of the Book as a String */ public String toString() { String s = "Title: " + title + ", " + "Author: " + author + ", " + "ISBN: " + isbn + ", " + "Year: " + year + ", " + "Pages: " + pages + "."; return s; } }