Отрисовка графика

public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
    Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
    primaryStage.setTitle("JavaFX Chart (Series)");
    NumberAxis x = new NumberAxis();
    NumberAxis y = new NumberAxis();
    LineChart<Number, Number> numberLineChart = new LineChart<Number, Number>(x,y);
    numberLineChart.setTitle("Series");
    XYChart.Series series1 = new XYChart.Series();
    XYChart.Series series2 = new XYChart.Series();
    series2.setName("cos(x)");
    series1.setName("sin(x)");
    ObservableList<XYChart.Data> datas = FXCollections.observableArrayList();
    ObservableList<XYChart.Data> datas2 = FXCollections.observableArrayList();
    for(int i=0; i<20; i++){
        datas.add(new XYChart.Data(i,Math.sin(i)));
        datas2.add(new XYChart.Data(i,Math.cos(i)));
    }
    series1.setData(datas);
    series2.setData(datas2);
    Scene scene = new Scene(numberLineChart, 600,600);
    numberLineChart.getData().add(series1);
    numberLineChart.getData().add(series2);
    primaryStage.setScene(scene);
    primaryStage.show();
}
public static void main(String[] args) {
    launch(args);
}
}