条形图上标签的刷新值javafx

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class BarChartWithRefreshValue extends Application {

    @Override
    public void start(Stage primaryStage) {
        // 创建X轴和Y轴
        CategoryAxis xAxis = new CategoryAxis();
        NumberAxis yAxis = new NumberAxis();

        // 创建条形图
        BarChart<String, Number> barChart = new BarChart<>(xAxis, yAxis);

        // 创建数据系列
        XYChart.Series<String, Number> series = new XYChart.Series<>();
        series.setName("Data");

        // 添加数据点
        ObservableList<XYChart.Data<String, Number>> data = FXCollections.observableArrayList(
                new XYChart.Data<>("Category 1", 10),
                new XYChart.Data<>("Category 2", 20),
                new XYChart.Data<>("Category 3", 30)
        );
        series.setData(data);

        // 添加数据系列到条形图
        barChart.getData().add(series);

        // 创建数值标签
        for (XYChart.Data<String, Number> d : data) {
            Label label = new Label();
            d.setNode(label);

            // 监听数据变化事件，更新数值标签的文本内容
            d.YValueProperty().addListener((observable, oldValue, newValue) -> {
                label.setText(newValue.toString());
            });
        }

        // 创建布局并添加条形图
        StackPane root = new StackPane();
        root.getChildren().add(barChart);

        // 创建场景并显示
        Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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