Listing 6: UnixModemConfigurator.java

public class UnixModemConfigurator 
   implements ModemVisitor
{
   public void visit(HayesModem m)
   {
      m.configurationString = "&s1=4&D=3";
   }

   public void visit(ZoomModem m)
   {
      m.configurationValue = 42;
   }

   public void visit(ErnieModem m)
   {
      m.internalPattern = "C is too slow";
   }
}
— End of Listing —