DegreeModificationController.java

package com.example.grademanager_gui;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.ButtonBar;
import javafx.scene.control.ButtonType;
import javafx.scene.control.TextField;
import javafx.stage.Stage;

import java.io.IOException;
import java.util.Optional;

public class DegreeModificationController extends MainController {
    @FXML
    protected TextField name;
    @FXML
    protected TextField bachelorDegree;
    @FXML
    protected TextField duration;
    @FXML
    protected TextField fees;
    @FXML
    protected TextField courses;
    @FXML
    protected TextField fieldOfStudy;
    @FXML
    protected TextField warning;



    private Stage stage;
    private Scene scene;
    private FXMLLoader root;

    @FXML
    protected void onSaveButtonClick(ActionEvent event) throws IOException {
        if(!name.getText().isBlank() && !bachelorDegree.getText().isBlank() &&
                !duration.getText().isBlank() && !fees.getText().isBlank() &&
                !courses.getText().isBlank() && !fieldOfStudy.getText().isBlank())
        {
            //studentList.add((String) name);
            switchToMain(event);
        }
        else {
            warning.setText("Bitte alle Felder ausfüllen");
        }
    }

    @FXML
    protected void switchToMain(ActionEvent event) throws IOException {
        root = new FXMLLoader(Main.class.getResource("main.fxml"));
        stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
        scene = new Scene(root.load(), 960, 540);
        stage.setTitle("Main");
        stage.setScene(scene);
        stage.show();
    }

    @FXML
    protected void abortAndSwitchToMain(ActionEvent event) throws IOException {
        Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
        alert.setTitle("Bestätigung erforderlich");
        alert.setHeaderText("Daten wurden nicht gespeichert. Änderungen verwerfen?");

        ButtonType buttonTypeOne = new ButtonType("Ja");
        ButtonType buttonTypeCancel = new ButtonType("Abbrechen", ButtonBar.ButtonData.CANCEL_CLOSE);

        alert.getButtonTypes().setAll(buttonTypeOne, buttonTypeCancel);

        Optional<ButtonType> result = alert.showAndWait();
        if (result.get() == buttonTypeOne){
            switchToMain(event);
        }
    }
}