Javafx fetching data from database to a table.

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.layout.BorderPane;
import java.sql.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;

public class ValuesFromDatabaseToTable extends Application
{
    PreparedStatement ps;
    Connection conn;
    ResultSet rs;
     String usernameSession;
     private final TableView<Contacts> table = new TableView<>();
      private final ObservableList<Contacts>data = FXCollections.observableArrayList();
    public static void main(String[]args)
    {
        Application.launch(args);
    } 
    @Override
    public void start(Stage primaryStage)
    {
        BorderPane tablebp = new BorderPane();
        Scene scene = new Scene(tablebp,1200,500);
        
        //creating the tablecolumn
        TableColumn fnameC = new TableColumn("FirstName");//column for firstname
        fnameC.setMinWidth(200);
        fnameC.setCellValueFactory(new PropertyValueFactory<>("FirstName"));
        
        
        TableColumn lnameC = new TableColumn("LastName");//column for lastname
        lnameC.setMinWidth(200);
        lnameC.setCellValueFactory(new PropertyValueFactory<>("LastName"));
        
        TableColumn surnameC = new TableColumn("SurName");//column for surname
        surnameC.setMinWidth(200);
        surnameC.setCellValueFactory(new PropertyValueFactory<>("SurName"));
        
        
        TableColumn phonenumberC = new TableColumn("PhoneNumber");//column for phonenumber
        phonenumberC .setMinWidth(200);
        phonenumberC .setCellValueFactory(new PropertyValueFactory<>("PhoneNumber"));
        
        TableColumn emailC = new TableColumn("Email");//column for surname
        emailC.setMinWidth(200);
        emailC.setCellValueFactory(new PropertyValueFactory<>("Email"));
        
        table.getColumns().addAll(fnameC,lnameC,surnameC,phonenumberC,emailC);
        table.setItems(data);
        tablebp.setCenter(table);//setting table on the center of the table
        
        //creating button for querying data from database to table
        Button loadB = new Button("load");
        tablebp.setPadding(new Insets(10,0,10,0));
        tablebp.setBottom(loadB);//setting the button at the bottom of the borderpane
        //setting action to query data from table
        loadB.setOnAction((ActionEvent t) -> {
            try {
                Class.forName("com.mysql.jdbc.Driver");
                conn = DriverManager.getConnection("jdbc:mysql://localhost/address","root","kevo");//my database connection string my database name is address username is root and password is kevo
                PreparedStatement ps = conn.prepareStatement("SELECT * FROM contacts");
                rs = ps.executeQuery();
                                while(rs.next())
                {
                     data.add(new Contacts(rs.getString("fname"),rs.getString("lname"),rs.getString("surname"),rs.getString("pnumber"),rs.getString("email")));
                }
                 conn.close();
            } catch (ClassNotFoundException ex) {
                Logger.getLogger(ValuesFromDatabaseToTable.class.getName()).log(Level.SEVERE, null, ex);
            } catch (SQLException ex) {
                Logger.getLogger(ValuesFromDatabaseToTable.class.getName()).log(Level.SEVERE, null, ex);
            }
        });
        
        primaryStage.setTitle("Database Values To Table");
        primaryStage.setScene(scene);
        primaryStage.show();
        
        
    }
     public static class Contacts
    {
        private final SimpleStringProperty FirstName;
        private final SimpleStringProperty LastName;
        private final SimpleStringProperty SurName;
        private final SimpleStringProperty PhoneNumber;
        private final SimpleStringProperty Email;
      
       private Contacts(String fname,String lname,String surname,String pnumber,String email)
       {
           this.FirstName = new SimpleStringProperty(fname);
           this.LastName = new SimpleStringProperty(lname);
           this.SurName = new SimpleStringProperty(surname);
           this.PhoneNumber = new SimpleStringProperty(pnumber);
           this.Email = new SimpleStringProperty(email);
       }
       public String getFirstName()
       {
           return FirstName.get();
       }
       public void setFirstName(String fname)
       {
           FirstName.set(fname);
       }
       public String getLastName()
       {
           return LastName.get();
       }
       public void setLastName(String lname)
       {
           LastName.set(lname);
       }
       public String getSurName()
       {
           return SurName.get();
       }
       public void setSurName(String surname)
       {
           SurName.set(surname);
       }
       public String getPhoneNumber()
       {
           return PhoneNumber.get();
       }
       public void setPhoneNumber(String pnumber)
       {
           PhoneNumber.set(pnumber);
       }
       public String getEmail()
       {
           return Email.get();
       }
       public void setEmail(String email)
       {
           Email.set(email);
       }
}

}
The code above produces the following result: