Toolkit.getDefaultToolkit and Dimension = getScreenSize() is too big

Question

So I normally use
Toolkit tk = Toolkit.getDefaultToolkit();
    Dimension dim = tk.getScreenSize();but in my application it was a little bit bigger than it should be, which in my case "1920x1600" isn't that big a deal.
However I made something for my mom, and when she used it on her tiny Dell 10" laptop it was REALLY cut off.
My Scene's size was set to dim.getWidth() and Height, so it should fill correctly right?
Should I NOT be using AWT's Toolkit? Is there something in FX I am missing?
Thanks all!!
~KZ

Answer 1

So the rectangle is just to get the bounds of my screen right?Yes.
It has nothing to do with actually creating it right?Right. Rectangle2D is similar to java.awt.Dimension.
Note that there is also javafx.scene.shape.Rectangle which is a shape.
Do I use the rectangle's Height/Width to set up my Scene's info? You can use it to set scene size. Let’s say you want to create a scene with a screen size:
javafx.stage.Screen screen = Screen.getPrimary();
javafx.geometry.Rectangle2D rectangle2D  = screen.getVisualBounds();
Scene scene = new Scene(root, rectangle2D.getWidth(), rectangle2D.getHeight());