Java with Blue J Programming Help

I have a problem in java coding: Please could you have a look at it, the problem is with addcopyofbook to produce a stock number. For example if you get the list of books it produces a unique stock code for every book, even if they are teh same book, also when you call it up in teh objects bench its hould give a differnt stock number for each book, taht u had to teh list.
if you can help I would appreciate this. Please could you please look at this attachment enclosed, which will give you a better idea.

Also any ideas of how to do a hashmap within a hashmap.

Thanks





public class Library
{
private String name;
private String address;
private HashMap books;
private int stockNumber;
private ArrayList stock;
private Random randomGenerator = new Random();

public Library()
{
name = "London Library";
address = "74 College Lane, AL10 9AB";
books = new HashMap();
stock = new ArrayList();
}
public void addBookCatalogue (Book book)
{
String title = book.getTitle();
books.put(title, book);
}
public void addcopyOfbook (Book book, int stock,int x)
{
String title = book.getTitle();
books.put(title, book);
stockNumber = 0;
for (int i = 1; i <= stock; i++)
{
stockNumber++;x++;
System.out.println(stockNumber);
}
}
public void addBookStock (Book book,int sN)
{
for (int i = 1; i <=sN; i++)
{
Book bk = new Book (book.getTitle(), book.getAuthor(), book.getIsbn());
stock.add (bk);
stockNumber = randomGenerator.nextInt();
}
}
public void addBookCatalogue2 (Book book)
{
if (books.containsKey(book))
{
System.out.println ("This book is already in the catalogue");
}
else
{
String tit = book.getTitle();
books.put(tit, book);
}
}
public void showCatalogue()
{
Collection<Book> theValues = books.values();
for (Book bk : theValues)
{
System.out.println (bk.toString());
}
}
public String toString()
{
return name + ": " + address + "
Catalogue:
" + books + "

Stock List: " + stock + stockNumber;
}
}

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