在javafx中向根添加一个Rectangle

Question

i try to create some shapes of javafx library..

So, in the 'start' method, when i create a new circle and i add it to the root, i don't have any problem :

@Override
    public void start(Stage primaryStage) {
        Group root = new Group();
        Scene scene = new Scene(root, 800, 600, Color.LIGHTBLUE);
        primaryStage.setScene(scene);

        Circle cercle = new Circle();
        cercle.setCenterX(300);
        cercle.setCenterY(200);
        cercle.setRadius(100);
        cercle.setFill(Color.YELLOW);
        cercle.setStroke(Color.ORANGE);
        cercle.setStrokeWidth(5);

        root.getChildren().add(cercle);
        primaryStage.show();
    }

but, when i try to do this with a rectangle, the compiler doesn't accept, and draw a red line under the 'add' method

@Override
    public void start(Stage primaryStage) {
        Group root = new Group();
        Scene scene = new Scene(root, 800, 600, Color.LIGHTBLUE);
        primaryStage.setScene(scene);

        Rectangle rectangle = new Rectangle();
        rectangle.setX(300);
        rectangle.setY(200);
        rectangle.setWidth(300);
        rectangle.setHeight(200);
        rectangle.setFill(Color.GREEN);
        rectangle.setStroke(Color.DARKGREEN);
        rectangle.setStrokeWidth(5);
        rectangle.setArcHeight(30);
        rectangle.setArcWidth(30);

        root.getChildren().add(rectangle);
        primaryStage.show();
    }

The compiler say :

The method add(Node) in the type List is not applicable for the arguments (Rectangle)

I see this in other programs, it work normally.

Note: I use eclipse luna and jdk 8

Answer 1

com.sun.javafx.geom.Rectangle is a JDK internal class and does NOT extend the Node class but you should not be using internal classes anyway. Remove this internal import and instead replace with:

import javafx.scene.shape.Rectangle

Answer 2

Use

import javafx.scene.shape.Rectangle;

instead of

import java.awt.Rectangle;