如何在JavaFX中逐个展示StrokeTransition的ArrayList？

import javafx.animation.StrokeTransition;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;

import java.util.ArrayList;

public class StrokeTransitionExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        Pane root = new Pane();
        Scene scene = new Scene(root, 400, 400);

        ArrayList<StrokeTransition> transitions = new ArrayList<>();

        Rectangle rectangle1 = new Rectangle(50, 50, 100, 100);
        rectangle1.setStroke(Color.RED);
        rectangle1.setFill(null);
        root.getChildren().add(rectangle1);

        Rectangle rectangle2 = new Rectangle(250, 250, 100, 100);
        rectangle2.setStroke(Color.BLUE);
        rectangle2.setFill(null);
        root.getChildren().add(rectangle2);

        StrokeTransition transition1 = new StrokeTransition(Duration.seconds(2), rectangle1);
        transition1.setFromValue(Color.RED);
        transition1.setToValue(Color.YELLOW);
        transitions.add(transition1);

        StrokeTransition transition2 = new StrokeTransition(Duration.seconds(2), rectangle2);
        transition2.setFromValue(Color.BLUE);
        transition2.setToValue(Color.GREEN);
        transitions.add(transition2);

        Timeline timeline = new Timeline();
        transitions.forEach(timeline::getKeyFrames);

        timeline.setCycleCount(Timeline.INDEFINITE);
        timeline.setAutoReverse(true);
        timeline.play();

        primaryStage.setScene(scene);
        primaryStage.show();
    }

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