JavaFX example: communication between windows

This example demonstrate how to communication between JavaFX windows.

JavaFX example: communication between windows

package javafx_windowcomm;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_WindowComm extends Application {
    
    SubWindow subWindow;
    Label mainMsg;
    
    @Override
    public void start(Stage primaryStage) {
        
        StackPane root = new StackPane();
        
        mainMsg = new Label();
        
        final TextField mainTextField = new TextField();
        Button mainSendButton = new Button("Send to sub-Window");
        mainSendButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                subWindow.setMsg(mainTextField.getText());
            }
        });
        
        VBox mainVBox = new VBox();
        mainVBox.getChildren().addAll(mainMsg, mainTextField, mainSendButton);
        root.getChildren().add(mainVBox);
        
        Scene scene = new Scene(root, 300, 250);
        
        primaryStage.setTitle("java-buddy");
        primaryStage.setScene(scene);
        primaryStage.show();
        
        subWindow = new SubWindow(this);
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    public void setMainMsg(String msg){
        mainMsg.setText(msg);
    }
    
    class SubWindow extends Stage{
        JavaFX_WindowComm parent;
        Label labelID;
        Label messageIn;
        TextField subTextField;
        Button subSendButton;
        Stage subStage;

        private SubWindow(JavaFX_WindowComm aThis) {
            parent = aThis;
            
            subStage = new Stage();
            Group subRoot = new Group();
            Scene scene = new Scene(subRoot, 300, 200);
            subStage.setScene(scene);
            subStage.show();
        
            VBox vBox = new VBox();
        
            labelID = new Label();
            labelID.setText(subStage.toString());
            
            messageIn = new Label();
            subTextField = new TextField();
            
            subSendButton = new Button("Send to main Window");
            subSendButton.setOnAction(new EventHandler<ActionEvent>() {

                @Override
                public void handle(ActionEvent t) {
                    setMainMsg(subTextField.getText());
                }

            });
                 
            vBox.getChildren().addAll(labelID, messageIn, subTextField, subSendButton);
            subRoot.getChildren().add(vBox);
        }
        
        public void setMsg(String msg){
            messageIn.setText(msg);
        }
        
    }
}