Passing Parameters between screens in JavaFX/FXML/SceneBuilder -

i'm attempting build simple proof of concept program using scenebuilder , fxml, consisting of 2 screens. first screen text field , button takes second screen, , second screen has label that, ideally, display whatever inside of text field when button hit. each screen has own fxml file , it's own controller. i've read up, down, , sideways fxmlloader, research points being ideal way done, still cant seem discern how use it. i'd implement in sort of "character creation" pre-game screen role playing game, players stat rolls/inventory choices moved initial screen either model calculating/processing, or second screens controller display.

okay, answer of sorts, bear me, found video 1 sahil huseynzade think made click me. thinking use fxmlloader import of sorts, somehow use during creation of controller in order access other controllers @ will. i've copied below code got working fxmlloader, comments pertaining how think fxmlloader working. sorry if explanations obtuse or poorly worded technical standpoint, or if i've been general novice/dunce throughout of this. did have further question though, expect it's bad form ask within answer, there way make information updated dynamically across windows? have 1 window have dice rolling button, who's results appear on window automatically?

package twoscreentest;  import java.io.ioexception; import java.net.url; import java.util.resourcebundle; import javafx.event.actionevent; import javafx.fxml.fxml; import javafx.fxml.fxmlloader; import javafx.fxml.initializable; import javafx.scene.node; import javafx.scene.parent; import javafx.scene.scene; import javafx.scene.control.button; import javafx.scene.control.label; import javafx.scene.control.textfield; import javafx.stage.stage;  public class screen1controller implements initializable {      @fxml     public label label;     @fxml     public button button;     @fxml     private textfield textcharname;      public string testtext;      @override     public void initialize(url url, resourcebundle rb) {         label.settext(byte.tostring((byte) (math.floor(math.random()*6)+1)));     }          @fxml     private void btnsend(actionevent event) throws ioexception {         playerinfo player = new playerinfo(textcharname.gettext(), double.parsedouble(label.gettext()));  // creating temporary container.         //((node)event.getsource()).getscene().getwindow().hide(); close previous window, testing easier disable it.         fxmlloader loader = new fxmlloader(); // creating fxmlloader         loader.setlocation(getclass().getresource("screen2.fxml")); // telling proper fxml file.         loader.load(); // loading said fxml.         parent p = loader.getroot(); // setting window, think how works,         //probably...         stage stage = new stage();         stage.setscene(new scene(p));         screen2controller screen2controller = loader.getcontroller(); // right here          //don't entirely get, know i'm using loader controller,         //what's "nameofcontrollerclass variablename"?         screen2controller.setcurrentinfo(player); // setting empty container in         // second class' variables ones in the temporary container         // created earlier.         screen2controller.testlabel.settext(testtext); // additional test, setting label         // on second screen variable set in controller separate button.         stage.show(); // create second screen.      }      @fxml     private void btnsend2(actionevent event) {          testtext = "hello world";     }  }