public Bank (List<Client> a){

        class PrintClientListener implements ClientRegistrationListener{

            @Override
            public void onClientAdded(Client c) {
                System.out.printf("New Client added.\nClient Info:\n%s",c.toString());
                }
            }
        class EmailNotificationListener implements ClientRegistrationListener{

            @Override
            public void onClientAdded(Client c) {
                System.out.printf("Notification email for client %s to be sent", c.getSalutation());
                }

            }
        class DebugListener {

        }

    }