$ public void Conectar() {
    try {

        conexion = DriverManager.getConnection("jdbc:mysql://localhost/sistema_gmg", "root", "1405");

        st = conexion.createStatement();
        rs = st.executeQuery("Select * from ciclos");
        rs.next();


        this.jtf_id_ciclo.setText(rs.getString("id_ciclo"));

        this.jtf_ciclo.setText(rs.getString("ciclo"));

        this.jtf_finicio.setText(rs.getString("fecha_inicio"));

        this.jtf_ftermino.setText(rs.getString("fecha_termino"));

    } catch (SQLException err) {

        JOptionPane.showMessageDialog(null, "Error " + err.getMessage());

    }
}