JavaFX 警报不会在新窗口中打开，而是在新选项卡中打开

Question

我正在使用带有场景构建器的 JavaFX 8，我正在尝试创建一个警报弹出窗口。请参阅下面的代码：

更新：包括我拥有的所有代码（不包括一些个人标识符）。

public class MainViewController {

    @FXML
    private void handleQuitButtonAction(ActionEvent event) {
        System.exit(0);
    }

    @FXML
    private void handleImportButtonAction(ActionEvent event) {
        FileChooser fileChooser = new FileChooser();
        fileChooser.setTitle("Select the file to import");
        File file = fileChooser.showOpenDialog(new Stage());
        Alert alert;
        if (FileAccess.importFile(file)) {
            alert = new Alert(AlertType.INFORMATION);
            alert.setTitle("Success!");
            alert.setHeaderText("Congrats!");
            alert.setContentText("Successfully imported data from the chosen file!");
        } else {
            alert = new Alert(AlertType.ERROR);
            alert.setTitle("Error!");
            alert.setHeaderText("Sorry...");
            alert.setContentText("Something wrong with the import, please try again.");
        }
        alert.showAndWait();

        // Refresh Scroll List
    }

    @FXML
    private void handleExportButtonAction(ActionEvent event) {
    }
}

---

public class MainApp extends Application {

    private Stage primaryStage;
    private BorderPane mainView;

    @Override
    public void start(Stage primaryStage) {
        this.primaryStage = primaryStage;
        this.primaryStage.setTitle("Main System");
        showMainView();
    }

    private void showMainView() {
        try {
            // Load Main View from FXML file.
            FXMLLoader loader = new FXMLLoader();
            loader.setLocation(MainApp.class.getResource("view/MainView.fxml"));
            mainView = (BorderPane) loader.load();

            // Show the scene containing the root layout.
            Scene scene = new Scene(mainView);
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public Stage getPrimaryStage() {
        return primaryStage;
    }

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

---

public class FileAccess {

    public static boolean importFile(File file) {
        return false;
    }
}

public class MainViewController {

    @FXML
    private void handleQuitButtonAction(ActionEvent event) {
        System.exit(0);
    }

    @FXML
    private void handleImportButtonAction(ActionEvent event) {
        FileChooser fileChooser = new FileChooser();
        fileChooser.setTitle("Select the file to import");
        File file = fileChooser.showOpenDialog(new Stage());
        Alert alert;
        if (FileAccess.importFile(file)) {
            alert = new Alert(AlertType.INFORMATION);
            alert.setTitle("Success!");
            alert.setHeaderText("Congrats!");
            alert.setContentText("Successfully imported data from the chosen file!");
        } else {
            alert = new Alert(AlertType.ERROR);
            alert.setTitle("Error!");
            alert.setHeaderText("Sorry...");
            alert.setContentText("Something wrong with the import, please try again.");
        }
        alert.showAndWait();

        // Refresh Scroll List
    }

    @FXML
    private void handleExportButtonAction(ActionEvent event) {
    }
}

但是，它没有打开新窗口，而是在新选项卡中打开警报（我没有与选项卡设置相关的任何内容），请参见下面的屏幕截图：

它甚至没有正确大小...

我正在使用 macOS Mojave。

谢谢！

Answer 1

解决了：

这是操作系统设置问题。在Dock of System Preferences 中，我在打开文档时将Prefer 选项卡设置为Always，将其设置为Manually 后，它可以正常工作。

感谢大家的帮助。