如何使用scatterchart JavaFX将符号变成圆？

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.ScatterChart;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;

public class ScatterChartExample extends Application {
    @Override
    public void start(Stage stage) {
        // 创建横轴和纵轴
        final NumberAxis xAxis = new NumberAxis();
        final NumberAxis yAxis = new NumberAxis();
        // 设置横轴和纵轴的标签
        xAxis.setLabel("X");
        yAxis.setLabel("Y");

        // 创建scatterchart对象
        final ScatterChart<Number, Number> scatterChart =
                new ScatterChart<>(xAxis, yAxis);
        scatterChart.setTitle("Scatter Chart Example");

        // 添加数据到scatterchart
        XYChart.Series series = new XYChart.Series();
        series.getData().add(new XYChart.Data(1, 1));
        series.getData().add(new XYChart.Data(2, 4));
        series.getData().add(new XYChart.Data(3, 8));
        series.getData().add(new XYChart.Data(4, 5));
        series.getData().add(new XYChart.Data(5, 2));
        scatterChart.getData().add(series);

        // 创建场景并将scatterchart添加到场景中
        Scene scene = new Scene(scatterChart, 600, 400);
        stage.setScene(scene);
        stage.show();
    }

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