public class Book {
	//Data
	int bookID;
	String title,author;
	int quantity;

	//Constructor
	public Book(int id,String t,String a,int q) {
		bookID = id;
		title = t;
		author = a;
		quantity = q;
	}

	//Methods
	public int compareTo(Book b) { return this.bookID - b.bookID; }
	
	public String toString() {
		return "(" + bookID + "," + title + "," + author + "," + quantity + ")";
	}
}