ChoiseBox JavaFX不显示数据

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.ChoiceBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class ChoiceBoxExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        ChoiceBox<String> choiceBox = new ChoiceBox<>();
        
        // 添加选项
        ObservableList<String> options = FXCollections.observableArrayList(
                "Option 1",
                "Option 2",
                "Option 3"
        );
        choiceBox.setItems(options);
        
        // 设置默认选项
        choiceBox.setValue("Option 1");
        
        VBox vbox = new VBox(choiceBox);
        Scene scene = new Scene(vbox, 200, 200);
        
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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