[FIXED] What is the purpose of using .getChildren().addAll() in JavaFX?

Issue

Sample code:

   HBox pane = new HBox(10); //new HBox pane
   pane.getChildren().addAll(lbl, btnAdd, btnSubtract);

I know how to implement and get this code to do what I want, but I'm not sure what each piece does. It would make more sense if I did not have to specify the lbl,btnadd,btnsubtract objects. If it executes addAll why do I have to specify all the buttons I already have?

Solution

If your button is already in the list of children that the HBox has, then you should not add it in. On the other hand, if your HBox does not have that child (e.g. Button btnAdd), then it wouldn't appear at all if you don't add it in.

If you are imagining that the HBox would magically make lbl, btnAdd and btnSubtract into its children because you have simply created those objects with codes, then you are wrong.

Answered By - Jai
Answer Checked By - Clifford M. (JavaFixing Volunteer)