This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
I agree with Anupam. Either make your CTVo class implement the Comparable interface, or make a custom Comparator which you will pass to sort(List list, Comparator c). Look for documentation about those classes, and try to figure out yourself how it works. Ask more if you still don't understand how Comparator/Comparable work Here is a place you could start with : http://java.sun.com/docs/books/tutorial/collections/interfaces/order.html