JavaFX -获取实际计算的HBOX大小

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class HBoxSizeExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        HBox hbox = new HBox();
        hbox.getChildren().addAll(/* 添加子节点 */);

        hbox.layout(); // 强制重新计算布局

        double width = hbox.getWidth();
        double height = hbox.getHeight();

        System.out.println("HBox的实际宽度：" + width);
        System.out.println("HBox的实际高度：" + height);

        primaryStage.setScene(new Scene(hbox, width, height));
        primaryStage.show();
    }

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