How to access TextArea from another window?

Question

JavaFX

There is a main window with TextArea, there is a second Filter window. How do I access the first window to pass text?

Answer 1

Let's have a link to the desired controller. Pass to the controller of the current window and manipulate the data of the parent window controller there.
How to get a link is up to you. Some make a static link and work through it. Some, when calling a child window, pass a reference to themselves.