JavaFX 30. Event Handler for a Line Chart

MainController.java

package application;
 
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.XYChart;
import javafx.scene.control.Label;
import javafx.scene.control.Tooltip;
import javafx.scene.input.MouseEvent;
 
public class MainController {
    @FXML LineChart<String, Number> lineChart;
    @FXML Label lbl;
    
    public void btn(ActionEvent event) {
        lineChart.getData().clear();
        XYChart.Series<String, Number> series = new XYChart.Series<String, Number>();
        series.getData().add(new XYChart.Data<String, Number>("Jan", 200));
        series.getData().add(new XYChart.Data<String, Number>("Feb", 500));
        series.getData().add(new XYChart.Data<String, Number>("Mar", 300));
        series.getData().add(new XYChart.Data<String, Number>("Apr", 600));
        series.setName("Month Pay");
        lineChart.getData().add(series);
        
        for (final XYChart.Data<String, Number> data : series.getData()){
            data.getNode().addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
 
                @Override
                public void handle(MouseEvent event) {
                    lbl.setText("X : "+data.getXValue()+"\nY : "+String.valueOf(data.getYValue()));
                    Tooltip.install(data.getNode(), new Tooltip("X : "+data.getXValue()+"\nY : "+String.valueOf(data.getYValue())));
                }
            });
        }
    }
}