将数据添加到Access数据库时，显示以下错误

线程“ AWT-EventQueue-0”中的异常java.lang.ClassCastException：类net.ucanaccess.jdbc.UcanaccessPreparedStatement无法转换为com.mysql.jdbc.PreparedStatement类（net.ucanaccess.jdbc.UcanaccessPreparedStatement和com.mysql.jdbc .PreparedStatement在hamody.NewJFrame.jButton1ActionPerformed（NewJFrame.java:115）的hamody.NewJFrame $ 1.actionPerformed（NewJFrame.java:66）的加载程序'app'的未命名模块中。

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
   String   usernames  ;
   usernames = jTextField1.getText();

   try {
      Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");

      String dbURL = "jdbc:ucanaccess://E:/Database410.mdb" ;


      connection = DriverManager.getConnection(dbURL); 

        // Step 2.B: Creating JDBC Statement 
        statement = connection.createStatement();

     pst =  (PreparedStatement) connection.prepareStatement("insert into user ( username ,password ) values( ?,? )") ; 
     pst.setString(1,usernames);
     int b=Integer.parseInt(jTextField2.getText());


     pst.executeUpdate();

     JOptionPane.showMessageDialog(this,"تم الاضافة");


 } catch (ClassNotFoundException ex){
    Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
    JOptionPane.showMessageDialog(this,ex);
 }  catch (SQLException ex) {
        Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
        JOptionPane.showMessageDialog(this,ex);
    }

}