public String getNextRDV(String msg) {
        String answer = "";

        boolean next = false;
        int nearestDate = 0;
        for (int i = 0; i < listCal.size(); i++) {
            if (listCal.get(i).getDebut().compareTo(Calendar.getInstance()) > 0) {
                nearestDate = i;
                next = true;
                break;
            }
        }

        if (!next) {
            answer = "Vous n'avez pas de rendez-vous !";
        } else {

            for (int i = 1; i < listCal.size(); i++) {
                if (listCal.get(i).getDebut().before(listCal.get(nearestDate).getDebut())
                        && listCal.get(i).getDebut().after(Calendar.getInstance())) {
                    nearestDate = i;
                }
            }

            answer = "Votre prochain rendez vous aura lieu le ";
            answer += listCal.get(nearestDate).getDate();
            answer += " de " + listCal.get(nearestDate).getHeureDeb() + " à " + listCal.get(nearestDate).getHeureFin();
        }

        return answer;
    }