Crear en una Clase JAVA FX que grafique una linea de tendencia

public class LineChartSample extends Application {

  @Override public void start(Stage stage) {
    //defining the axes
    final NumberAxis xAxis = new NumberAxis();
    final NumberAxis yAxis = new NumberAxis();
    xAxis.setLabel("Number of Month");
    //creating the chart
    final LineChart<Number,Number> lineChart = 
            new LineChart<Number,Number>(xAxis,yAxis);
            
    lineChart.setTitle("Stock Monitoring, 2010");
    //defining a series
    XYChart.Series series = new XYChart.Series();
    series.setName("My portfolio");
    //populating the series with data
    series.getData().add(new XYChart.Data(1, 23));
    series.getData().add(new XYChart.Data(2, 14));
    series.getData().add(new XYChart.Data(3, 15));
    series.getData().add(new XYChart.Data(4, 24));
    series.getData().add(