This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
There's nothing special about a single-value select statement. You code a getter and setter for a property of type String, just as you would with any other ActionForm property. In this case, getSelectedCounty, and setSelectedCounty.