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";
    }
}