.showErrorMessage("Please select the group you wish add to user.");
.showErrorMessage("Please select the group you " + "wish add to user.");
    public void addUser() {        try {            String selectedUser = view.getSelectedUser();            if (selectedUser == null) {                view.showErrorMessage("Please select a user to add.");                return;            }            if (!model.findUserByName(selectedUser)) {                return;            }            String groupSelected = view.getSelectedGroup();            if (groupSelected == null) {                view                        .showErrorMessage("Please select the group you wish add to user.");                return;            }            if (!model.findGroupByName(groupSelected)) {                return;            }            model.addGroupToUser(model.getCurrentGroupID());            view.setGroupDetails(model.getCurrentGroup());            // view.refresh();            view.refreshMembershipList();        } catch (Exception e) {            handleException(e, "add user to a group");        }    }