Dynamically change the color of a Rectangle in Javafx

Question

I am creating a two javafx.scene.shape.Rectangle objects in a GridPane and doing the following.

rectArray = new Rectangle[2];

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Answer 1

You are sleeping on the UI thread which blocks any further processing (including refreshing the screen).

If you need to delay some code you can use a PauseTransition to wait for two seconds and use its onFinished method to run the rest of your code after the wait.