[Dsol-java] Question StockApplication Example

[Fu C. <col...@ho...>]

Hi Peter
I have two questions about StockApplication Example.First, what does 
"interator()" exactly mean? I'm confused about that. In this example, is it 
used to search the list object? The second question is also about that 
"for" loop. why you changed type of "next" to ValueChangListenerInterface 
type. I don't understand this. can you explain it. wait for your 
reply.Thanks. 
for (Iterator i = this.listeners.iterator(); i.hasNext();)
		{
			ValueChangeListenerInterface next = (ValueChangeListenerInterface) 
i.next();

			//Let's inform the guy!
			next.notify(stock);

Kind regards
Colitas