private DatabaseConnection() {
        // Eigenschaften
  
        String password = "4xd3";
      String user = "j81";
//        String password = "";
 //       String user = "root";
        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection("jdbc:mysql://localhost/j81", user, password);
            statement = connection.createStatement();
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(DatabaseConnection.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SQLException ex) {
            Logger.getLogger(DatabaseConnection.class.getName()).log(Level.SEVERE, null, ex);
        }
    }