public class UserDAO extends DBConnection {
    public int flag;
    public PreparedStatement ps;
    public Connection conn;
    public ResultSet rs;
public boolean refer(UserDTO dto) {
        conn = getConnection();
        String sql = "select * from tb_user where user_id=?";
        try {
            ps = conn.prepareStatement(sql);
            ps.setInt(1, dto.getUser_id());
            rs = ps.executeQuery();
            if (rs.next()) {
                int id = rs.getInt("user_id");
                 String name = rs.getString("user_name");
                String pass = rs.getString("user_pass");
                return true;
            }
        } catch (SQLException e) {

            e.printStackTrace();
        } finally {
            close(conn, ps, rs);
        }
        return false;
    }

}

问题:怎么样在main函数中输出id,name,pass?