ConexionBD MySQL

public class ConexionBD implements Serializable {

    public static String user = "root";
    public static String password = "S1GdMySqL123";
    public static String url = "jdbc:mysql://localhost:3306/sigd";
    public static String className = "com.mysql.jdbc.Driver";

    public Connection conn = null;

    public ConexionBD() {
        try {
            Class.forName(className);
            conn = DriverManager.getConnection(url, user, password);
            if (conn != null) {
                System.out.println("Si se pudo conectar a la BD");
            }
        } catch (SQLException | ClassNotFoundException ex) {
            System.err.println("No se pudo conectar a la BD, error: " + ex.toString());
        }
    }

    public Connection getConexion() {
        return conn;
    }

    public void desconectar() throws SQLException {
        System.out.println("Se desconectó de la BD");
        conn.close();
        conn = null;
    }
}