javafx中带渐变颜色的矩形

import javafx.application.Application;
import import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        Rectangle rectangle = new Rectangle(200, 200);
        rectangle.setFill(Color.RED);
        rectangle.setStroke(Color.BLACK);

        rectangle.setFill(new LinearGradient(0, 0, 1, 1, true, CycleMethod.NO_CYCLE,
                new Stop(0, Color.RED), new Stop(1, Color.YELLOW)));

        StackPane root = new StackPane();
        root.getChildren().add(rectangle);

        Scene scene = new Scene(root, 400, 400);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}