Creating default group

[geethanjali alaguraj]

Hello,
is this possible to create a new default group called user1group like Administrator and Anonymous through backend.
i have tried to in Group.java class

 @Transient
    public static final String ANONYMOUS = "Anonymous";

    @Transient
    public static final String ADMIN = "Administrator";

    @Transient

    public static final String USER = "User";

like this and also i have add in groupserviceimpl

 @Override
    public void initDefaultGroupNames(Context context) throws SQLException, AuthorizeException {
        GroupService groupService = EPersonServiceFactory.getInstance().getGroupService();
        // Check for Anonymous group. If not found, create it
        Group anonymousGroup = groupService.findByName(context, Group.ANONYMOUS);
        if (anonymousGroup == null) {
            anonymousGroup = groupService.create(context);
            anonymousGroup.setName(Group.ANONYMOUS);
            anonymousGroup.setPermanent(true);
            groupService.update(context, anonymousGroup);
        }


        // Check for Administrator group. If not found, create it
        Group adminGroup = groupService.findByName(context, Group.ADMIN);
        if (adminGroup == null) {
            adminGroup = groupService.create(context);
            adminGroup.setName(Group.ADMIN);
            adminGroup.setPermanent(true);
            groupService.update(context, adminGroup);
        }

        Group userGroup = groupService.findByName(context, Group.USER);
        if (userGroup == null) {
            userGroup = groupService.create(context);
            userGroup.setName(Group.USER);
            userGroup.setPermanent(true);
            groupService.update(context, userGroup);
        }
    }like this
but it does not create the default group