This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Why don't you post what have you got so far and we can help you figure out the rest?
Also look at this link:
http://faq.javaranch.com/java/TellTheDetails Also Googling will returns plenty of example for this particular problem .