TableColumn StudentIDColumn = new TableColumn("StudentID");
        StudentIDColumn.setMinWidth(100);
        StudentIDColumn.setCellValueFactory(
          new PropertyValueFactory<StudentCourse, String>("StudentID"));

        TableColumn CourseIDColumn = new TableColumn("CourseID");
        CourseIDColumn.setMinWidth(100);
        CourseIDColumn.setCellValueFactory(
          new PropertyValueFactory<StudentCourse, String>("CourseID"));

        TableColumn GradeColumn =
          new TableColumn("Grade");
        GradeColumn.setMinWidth(100);
        GradeColumn.setCellValueFactory(
          new PropertyValueFactory<StudentCourse, String>("Grade"));

        tableView.getColumns().addAll(StudentIDColumn, CourseIDColumn,
                GradeColumn);

import javafx.application.Application;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
import java.sql.*;

class StudentCourse {
    final SimpleStringProperty StudentID;
    final SimpleStringProperty CourseID;
    final SimpleStringProperty Grade;

   StudentCourse(String StudentID, String CourseID,
       String Grade) {
     this.StudentID = new SimpleStringProperty(StudentID);
     this.CourseID = new SimpleStringProperty(CourseID);
     this.Grade = new SimpleStringProperty(Grade);
   }

    String getStudentID() {
     return StudentID.get();
   }

    void setStudentID(String StudentID) {
     this.StudentID.set(StudentID);
   }

    String getCourseID() {
     return CourseID.get();
   }

    void setCourseID(String CourseID) {
     this.CourseID.set(CourseID);
   }

    String getGrade() {
     return Grade.get();
   }

    void setGrade(String Grade) {
     this.Grade.set(Grade);
   }
 }
class DataConn {
    //Interface to connect to the database
    private Connection con = null;
    String url = "jdbc:mysql://localhost:3306/Registration?useSSL=false";
    String uname = "root";
    String pass1 = "Root";
    public DataConn() {
    try {
    //step2: load and register the driver
    Class.forName("com.mysql.cj.jdbc.Driver");
    //step 3: establish connection
    con = DriverManager.getConnection(url, uname, pass1);
    } catch(Exception ex) {
    ex.printStackTrace();
    }
    }
    //load data from database
    ObservableList<StudentCourse> selectStatementGrade() {
        Statement st = null;
        ResultSet rs = null;
        String query = "SELECT * FROM Registration.StudentCourse";
        ObservableList<StudentCourse> data = FXCollections.observableArrayList();
        try {
        st = con.createStatement();
        rs = st.executeQuery(query);
        while(rs.next()) {
        String StudentID = rs.getString("StudentID");
        String CourseID = rs.getString("CourseID");
        String Grade = rs.getString("Grade");
        data.add(new StudentCourse(StudentID, CourseID, Grade));
            }
        } catch(Exception ex) {
        ex.printStackTrace();
        }
        System.out.println(data.get(0).getStudentID());
        return data;
    }
}

public class TableView extends Application{

    public static void main(String[] args) {
        launch(args);

    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        //some code //

        Stage temp = new Stage();
        TableView<StudentCourse> tableView = new TableView<>();
        //constructs connection object
        DataConn dbc = new DataConn();
        ObservableList<StudentCourse> data = dbc.selectStatementGrade();

        System.out.println(data.get(0).getCourseID());
        tableView.setItems(data);

        TableColumn StudentIDColumn = new TableColumn("StudentID");
        StudentIDColumn.setMinWidth(100);
        StudentIDColumn.setCellValueFactory(
          new PropertyValueFactory<StudentCourse, String>("StudentID"));

        TableColumn CourseIDColumn = new TableColumn("CourseID");
        CourseIDColumn.setMinWidth(100);
        CourseIDColumn.setCellValueFactory(
          new PropertyValueFactory<StudentCourse, String>("CourseID"));

        TableColumn GradeColumn =
          new TableColumn("Grade");
        GradeColumn.setMinWidth(100);
        GradeColumn.setCellValueFactory(
          new PropertyValueFactory<StudentCourse, String>("Grade"));

        tableView.getColumns().addAll(StudentIDColumn, CourseIDColumn,
                GradeColumn);

        Pane paneTemp = new Pane();
        paneTemp.getChildren().add(tableView);
        Scene sceneTemp = new Scene(paneTemp, 300, 250);
        temp.setTitle("TableViewDemo"); // Set the window title
        temp.setScene(sceneTemp); // Place the scene in the window
        temp.show(); // Display the window

    }
}