我完全卡住了。我尝试用表视图创建stage，但只有在单击按钮后数据才需要存在。当我把所有代码放在initialize方法中时，一切都是正确的，tableview也实现了，但是当我尝试分离代码时（在initialize setcellvaluefactory中，但我方法点击按钮后填充可观察列表）我总不能这样做-方法正在工作我正在连接数据库（我看到hibernate输出），但在表视图上没有任何更改：（我没有任何错误。

package org.example;

import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.MapChangeListener;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.MapValueFactory;
import javafx.stage.Stage;
import org.example.DAO.CoursesInfoDAO;
import org.example.entity.CoursesInfo;

import java.net.URL;
import java.util.*;

public class StudentViewController  {  

    @FXML
    TableView<Map<String, Object>> studentTable;

    @FXML
    TableColumn<Map, String> language;

    @FXML
    TableColumn<Map, String> level;

    @FXML
    TableColumn<Map, String> surname;

    @FXML
    TableColumn<Map, Integer> price;

    @FXML
    TableColumn<Map, String> startDate;

    @FXML
    TableColumn<Map, String> endDate;

    @FXML
    TableColumn<Map, String> seats;

    @FXML
    TableColumn<Map, String> occupied;

    @FXML
    Button allCourses;

    public TableView getStudentTable() {
        return studentTable;
    }

    public StudentViewController() {

    }

    public ObservableList<Map<String, Object>> items;

    @FXML
   public void initialize(URL location, ResourceBundle resources) {
        language.setCellValueFactory(new MapValueFactory("language"));
        //level = new TableColumn<>("Poziom");
        level.setCellValueFactory(new MapValueFactory("level"));
        //surname = new TableColumn<>("Nazwisko nauczyciela");
        surname.setCellValueFactory(new MapValueFactory("surname"));
        //price = new TableColumn<>("Cena");
        price.setCellValueFactory(new MapValueFactory("price"));
        //startDate = new TableColumn<>("Początek");
        startDate.setCellValueFactory(new MapValueFactory("startDate"));
        //endDate = new TableColumn<>("Koniec");
        endDate.setCellValueFactory(new MapValueFactory("endDate"));
        //seats = new TableColumn<>("Miejsca");
        seats.setCellValueFactory(new MapValueFactory("seats"));
        //occupied = new TableColumn<>("Zajęte");
        occupied.setCellValueFactory(new MapValueFactory("occupied"));

    }

    private Stage loginStage;

    public void setLoginStage(Stage loginStage) {
        this.loginStage = loginStage;

    }

    @FXML
    private void displayAllcourses() {

        items = FXCollections.observableArrayList();
        //ObservableList<Map<String,Object>> temp = FXCollections.observableArrayList();
        //studentTable.setItems(temp);
        CoursesInfoDAO coursesInfoDAO = new CoursesInfoDAO();
        List<CoursesInfo> allCourses = coursesInfoDAO.getListOfCourses();
        for (CoursesInfo i : allCourses) {
            Map<String, Object> item = new HashMap<>();
            item.put("language", "ola");
            item.put("level", "ola");
            item.put("surname", "ola");
            item.put("price", "ola");
            item.put("startDate", "ola");
            item.put("endDate", "ola");
            item.put("seats", i.allSeats);
            item.put("occupied", "ola");
            //studentTable.getItems().add(item);
            //studentTable.refresh();
            items.add(item);
            //temp.add(item);
        }
        studentTable.setItems(items);

    }

}