javafx - Variables with multiple FXML files -

i have multi scene javafx fxml application based on angela caicedo code https://blogs.oracle.com/acaicedo/entry/managing_multiple_screens_in_javafx1

i have added textfield scene2.fxml , scene3.fxml files each scene has own controller class screenscontroller class loads hashmap id name, node screen defined in screensframework class (main class)

public void addscreen(string name, node screen) {     screens.put(name, screen); } 

so each time click button on screen (scene) fire actionevent , move screen

mycontroller.setscreen(screensframework.screen2id); 

what if possible use value in textfield on screen2 , transfer textfield on scene3. have discovered unless both fxml files loaded far not possible. desktop application. how create variable global , has life after 1 class unloaded or 1 fxml file unloaded? @ point not want database accomplish task. have developed in visual basic 6 declare global variable used through out application.

define model class:

public class model {      // define properties, example:      private stringproperty text = new simplestringproperty();      public stringproperty textproperty() {         return text ;     }      public final string gettext() {         return textproperty().get();     }      public final void settext(string text) {         textproperty().set(text);     }      // other properties...  } 

instantiate in screenscontroller class , expose it:

public class screenscontroller extends stackpane {      private final model model = new model() ;      public model getmodel() {         return model ;     }      // other code before... } 

now can bind things together:

public class screencontroller2 implements controlledscreen, initializable {      private screenscontroller mycontroller ;      @fxml     private textfield textfield ;      // other code...      @override      public void setscreenparent(screenscontroller parent) {         this.mycontroller = parent ;          // either:         mycontroller.getmodel().settext(textfield.gettext());         textfield.textproperty().addlistener((obs, oldtext, newtext) ->              mycontroller.getmodel().settext(newtext));          // or, depending on exact behavior want:         mycontroller.getmodel().textproperty()             .bindbidirectional(textfield.textproperty());     }      // ... } 

and

public class screencontroller3 implements controlledscreen, initializable {      private screenscontroller mycontroller ;      @fxml     private textfield textfield ;      // other code ...      @override     public void setscreenparent(screenscontroller parent) {         this.mycontroller = parent ;          // again, replace next 2 lines bidirectional         // binding if behavior want         textfield.settext(mycontroller.getmodel().gettext());         mycontroller.getmodel().textproperty().addlistener((obs, oldtext, newtext) ->              textfield.settext(newtext));     }      // ... }