使用FXML将JavaFX FlowPane放入BorderPane中

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.FlowPane?>

<BorderPane xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
    <center>
        <FlowPane fx:id="flowPane" alignment="CENTER" hgap="10" vgap="10">
            <!-- 添加子节点 -->
            <Button text="Button 1" />
            <Button text="Button 2" />
            <Button text="Button 3" />
        </FlowPane>
    </center>
</BorderPane>

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        FXMLLoader loader = new FXMLLoader(getClass().getResource("sample.fxml"));
        Parent root = loader.load();

        // 获取FXML文件中定义的FlowPane实例
        FlowPane flowPane = loader.getController().flowPane;

        // 创建BorderPane实例
        BorderPane borderPane = new BorderPane();
        // 将FlowPane放入BorderPane的中心
        borderPane.setCenter(flowPane);

        // 创建场景
        Scene scene = new Scene(borderPane, 400, 300);

        primaryStage.setTitle("JavaFX Application");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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