JavaFX FlowPane在ScrollPane中，动态调整滚动窗格的内容和大小

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class ScrollPaneExample extends Application {
    @Override
    public void start(Stage primaryStage) {
        FlowPane flowPane = new FlowPane();
        for (int i = 1; i <= 20; i++) {
            Label label = new Label("Label " + i);
            flowPane.getChildren().add(label);
        }

        ScrollPane scrollPane = new ScrollPane(flowPane);
        scrollPane.setFitToWidth(true);
        scrollPane.setFitToHeight(true);

        Scene scene = new Scene(scrollPane, 400, 200);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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