enum SQLGroup{
        INSERT("INSERT INTO groups (group_id, group_name) VALUES(DEFAULT, (?)) RETURNING group_id"),
        UPDATE("UPDATE groups SET group_name = (?) WHERE group_id = (?) RETURNING group_id");
        String QUERY;

        SQLGroup(String QUERY) {
            this.QUERY = QUERY;
        }
    }

    @Override
    public Optional<Group> update(Group group) {
        try(PreparedStatement statement = connection.prepareStatement(SQLGroup.UPDATE.QUERY)){
            statement.setString(1,group.getName());
            statement.setInt(2, group.getId());
            try (ResultSet resultSet = statement.executeQuery()) {
                if (resultSet.next()) {
                    group.setId(resultSet.getInt(1));
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return Optional.of(group);
    }
code below is in the main method
 groupDAO.update(new Group(1,"FK-22")).ifPresent(group -> System.out.println(group.getName()));