Placing buttons on opposite sides of an adjustable window in JavaFX - javafx

Question

I have two buttons that I'd like to use in my display screen: a reset button, and a settings button.
The problem is, I want them on opposite sides of the window (reset in the top right corner and settings in the top left) while being the same height. When I expand the window, however, the buttons stay in the same place, but I want them to move with the window walls.
I first tried using setAlignment of my reset button to Pos.*TOP_RIGHT* and the settings button to top left, but it comes out with the settings button being on top of the reset button.
resetButton = new Button("Reset Gameboard");this.setTop(resetButton);
resetBox = new HBox(resetButton);
resetBox.setAlignment(Pos.TOP_RIGHT);
backButton = new Button("Back to Settings");
this.setTop(backButton);
backBox = new HBox(backButton);
backBox.setAlignment(Pos.TOP_LEFT);
resetbackBox = new HBox(backButton, resetButton);
this.setTop(resetbackBox);`
I currently am using (below) which during the initial window appears to be working and correctly spaced, but as soon as you expand the window the reset button doesn't follow it, although the settings button does.
`resetButton = new Button("Reset Gameboard");
this.setTop(resetButton);
resetBox = new HBox(resetButton);
resetBox.setAlignment(Pos.TOP_RIGHT);
backButton = new Button("Back to Settings");
this.setTop(backButton);
backBox = new HBox(backButton);
backBox.setAlignment(Pos.TOP_LEFT);
resetbackBox = new HBox(backButton, resetButton);
resetbackBox.setSpacing(380);
this.setTop(resetbackBox);`

Answer 1

The problem start from this line:
resetbackBox.setSpacing(380);
You have setted a fixed spacing value. To fix that you can easily add a component to HBox called Region, this component allow to set a grow area between two buttons:
Button resetButton = new Button("Reset Gameboard");
Button backButton = new Button("Back to Settings");
Region region = new Region();
HBox.setHgrow(region, Priority.ALWAYS);
HBox topHBox = new HBox(backButton, region, resetButton);
this.setTop(resetbackBox);