Accepting radio button input from a form into a servlet

Please give me the code to get a value from a radio button when a form is posted to a servlet.
In my servlet I have:

cases=req.getParameter("case");

case is the radio button and cases is a boolean to store the value of it, true or false. This doesn't work as getParameter is looking for a String return from case not a boolean. What does a radio button return and how do I code for it.

Thanks
Mel