/*
 * T01n22.java -- A demonstration of an array of objects.  Here, we want to
 * have an array of books.
 *
 * We've created a Book class that has only three data members and 
 * the default constructor; no methods are defined.  This is unusual;
 * normally, you'd write a complete class with getters, setters, etc.
 * I'm doing this to show that you can use classes to create a simple
 * collection of data items that belong together.  (In other languages,
 * such collections of data items are called structures or records.)
 * Remember, this use of a class is NOT the norm!
 *
 * An I/O Note:  In this program we have to mix integer and string input.
 * Scanner's nextInt() will stop reading when it finds a character that
 * can't be used in a number, such as the newline (\n) character that you
 * have to type to end your input.  That will be read by the next
 * input method.  If that next input happens to be nextLine(), then
 * it sees \n first, and assumes that's all the input it's meant to accept.
 * To work around this behavior, this program reads everything as a string,
 * and converts to integers what were entered as integers.  Of course,
 * a more complete program would verify that the input is actually a
 * legal integer first, as we've seen in earlier examples.
 */

import java.util.*;


class Book
{
    public String title;     // The title of the book
    public String author;    // The name of the book's author
    public    int copyright; // The date the work was published (approx.)
}


public class T01n22
{
    public static void main (String [] args)
    {
        Book[]  volumes;      // our array of book objects
        char    answer;       // Y/N response from the user
        int     quantity = 0, // current number of books entered by the user
                limit = 0;    // user-specified quantity of books to be entered
        Scanner keyboard = new Scanner (System.in);  // source of user input

        System.out.print("How many books will you enter? : ");
        limit = Integer.parseInt(keyboard.nextLine());

        volumes = new Book[limit];

        while (quantity < limit) {
            volumes[quantity] = new Book();

            System.out.print("\nEnter book " + (quantity+1) + "'s title : ");
            volumes[quantity].title = keyboard.nextLine();

            System.out.print("Enter \"" + volumes[quantity].title 
                           + "\"'s author : ");
            volumes[quantity].author = keyboard.nextLine();

            System.out.print("Enter \"" + volumes[quantity].title 
                           + "\"'s copyright date : ");
            volumes[quantity].copyright = Integer.parseInt(keyboard.nextLine());

            quantity++;
        }

        if (quantity > 0) {
            System.out.println("\nHere are the volumes in your collection:");

            for (int i = 0; i < quantity; i++)
                System.out.println("\"" + volumes[i].title + "\", by " 
                                 + volumes[i].author
                                 + " (" + volumes[i].copyright + ")");
            System.out.println();
        }
    }

}