public void loadUserData (String fileName) {
		try {
			JsonReader reader = new JsonReader(new FileReader(fileName));
			JsonParser parser = new JsonParser();
			JsonArray array = parser.parse(reader).getAsJsonArray();

			for (JsonElement elem : array) {
				UserData info = gson.fromJson(elem, UserData.class);
				User user = new User(info);
				UserManager.userMap.put(info.getLocalName(), user);
				UserManager.networkMap.put(user, Network.createNetwork(user));
			}
		} catch (IOException ioe) {
			System.err.println("Could not find or use file " + fileName + " !");
		}
	}