package application;


import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("Layout_play.fxml"));
        primaryStage.setTitle("Test");
        primaryStage.setFullScreen(true);
        primaryStage.setScene(new Scene(root, 1280, 720));
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch(args);
    }
}

public class PlayController {

    @FXML
    private Label label;
    @FXML
    private TextField textfield;

    @FXML
    private BackgroundImage myBI= new BackgroundImage(new Image("/Background.png",1280,720,false,true),
            BackgroundRepeat.REPEAT, BackgroundRepeat.NO_REPEAT, BackgroundPosition.DEFAULT,
              BackgroundSize.DEFAULT);



    @FXML
    private void handleButtonAction(ActionEvent event) {
        System.out.println("You clicked me!");
        label.setText("Hello  " + textfield.getText());
    }
}

<BorderPane fx:controller="application.PlayController" xmlns:fx="http://javafx.com/fxml"
    prefHeight="200" prefWidth="320" >

    <top>
        <Text text="java-Buddy"/>
    </top>
    <left>
        <Label text="Who are you?"/>
    </left>
    <center>
        <TextField id="textfield" fx:id="textfield"/>
    </center>
    <right>
        <Button id="button"  text="Click Me!"
            onAction="#handleButtonAction" fx:id="button"/>
    </right>
    <bottom>
        <Label id="label" fx:id="label"/>
    </bottom>

</BorderPane>