Sometimes, you want to find the number of arguments that a Servlet got and then want to proceed accordingly. Review the code below:

Java Code:
int i = req.getParameterMap().size();
if (i = 0) {
   // no arguments
   }
else  {
    Enumeration paramNames = req.getParameterNames();
    while(paramNames.hasMoreElements()) {
      String parm = (String)paramNames.nextElement();
      // do something with this parm
      }
}