public void listWhispers(){
		ChannelTree tmp;
		Channel chan;
		String str;
		for(long id : channelManager.getTree().keySet()){
			tmp = channelManager.getChannel(id);
			if(tmp instanceof Channel){
				str = "";
				if(((Channel) tmp).isWhisper()){
					chan = (Channel)tmp;
					str += " " + id + " - " + chan.getName() + " - owner : " + chan.getOwner().getUsername() +" - users : ";
					for(String username : chan.getUsers()){
						str += "\n" + getUser(username).getId()+ " - "+getUser(username);
					}
					System.out.println(str);
				}
			}
		}
	}