Listing 4: ZoomModem.java

public class ZoomModem implements Modem
{
    public void dial(String pno){}
    public void hangup(){}
    public void send(char c){}    
    public char recv() {return 0;}
    public void accept(ModemVisitor v) {v.visit(this);}
    
    int configurationValue = 0;
}