Polygon() constructor from Polygon has the following syntax.
public Polygon()
In the following code shows how to use Polygon.Polygon() constructor.
import javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.shape.Polygon; import javafx.stage.Stage; //www . java 2s . co m public class Main extends Application { @Override public void start(Stage stage) { Group root = new Group(); Scene scene = new Scene(root, 260, 80); stage.setScene(scene); Group g = new Group(); Polygon polygon = new Polygon(); polygon.getPoints().addAll(new Double[]{ 0.0, 0.0, 20.0, 10.0, 10.0, 20.0 }); g.getChildren().add(polygon); scene.setRoot(g); stage.show(); } public static void main(String[] args) { launch(args); } }