public void logParticipants(String[] userList) {
		if (participants.length == 0) {
			Arrays.sort(userList);
			participants = userList;
		} else {
			String[] tmp = new String[participants.length + userList.length];
			System.arraycopy(participants, 0, tmp, 0, participants.length);
			System.arraycopy(userList, 0, tmp, participants.length, userList.length);
			Arrays.sort(tmp);
			int k = 0;
			for (int i = 0; i < tmp.length; i++) {
				if (i > 0 && tmp[i].equals(tmp[i - 1])) {
					continue;
				}
				tmp[k++] = tmp[i];
			}
			participants = new String[k];
			System.arraycopy(tmp, 0, participants, 0, k);
		}
	}