如何在javaFX中识别具有相同变量名的对象？

Question

我们想要创建一个应用程序，用户可以在场景中制作不同的多边形，然后程序允许用户通过单击它们来识别这些多边形。多边形是在代码的这一部分中制作的：

private boolean draw = true;
private Polugon polygon;
private Group root;
private List<Double> coordinates = new ArrayList<>();
int polygonId = 0;
private EventHandler<MouseEvent> polygonDrawer = new EventHandler<MouseEvent>() {
        @Override
        public void handle(MouseEvent mouseEvent) {
        if (mouseEvent.getClickCount() == 2 && draw) { //if the user clicks on the scene twice the polygon-drawing is finished
            draw = false;
            polygonId ++; //every polygon has its own ID
            coordinates = new ArrayList<>();

        } else if (mouseEvent.getEventType() == MouseEvent.MOUSE_PRESSED) {
            draw = true;
            coordinates.add(mouseEvent.getX());
            coordinates.add(mouseEvent.getY());
            polygon = new Polugon(polygonId);
            polygon.getPoints().addAll(coordinates);
            root.getChildren().add(polygon);
        }
    }
};

Class Polugon：

public class Polugon extends Polygon{
    private int id;

    public Polugon(int id) {
        this.id = id;
    }

    public String toString() {
        return "Polygon ID " + id;
    }
//there are other methods
}

我们尝试制作一个EventHandler，它会在单击多边形时打印出多边形的ID，但它总是返回已绘制的最后一个多边形的ID。有关详细信息：我们有ToggleButtons用于绘制多边形并获取场景中多边形的ID。

如果这些多边形具有相同的变量名称，如何识别这些多边形？