How to return value from a stage before closing it?

Question

First of all, sorry for the bad english.

Here is the case:

I have a \"main stage\" where i press a button to open a \"second stage\" where i have a table, th

Answer 1

There is some error in 4baad4's example. If the method in the controller is iCanGetDataBeforeClose, then that's what should be called:

String someValue = controller.iCanGetDataBeforeClose();

But even that didn't work right for me. I actually got this to work without using setOnCloseRequest at all. In the form controller, I had a method like this:

public boolean getCompleted() {
    return this.finished;
}

Then in the form calling it:

FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("myView.fxml"));
AnchorPane pane = (AnchorPane) loader.load();
myViewController controller = loader.getController();
Scene scene = new Scene(pane);
Stage stage = new Stage();
stage.setScene(scene);
stage.showAndWait();
if (controller.getCompleted()){
    doStuff();
}

One might think that since the stage had exited that the controller would throw a null reference exception, but it didn't, and it returned the correct response.

This solution works and is simplest proposed IMHO.