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.
You can do that using a bitmask. Basically you do a bitwise AND with a mask, designed to pick out the one or more bits you're looking for. You can easily add numbers into Strings using the appropriate String constructor. --Mark