package application;


import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.input.KeyEvent;



public class Main extends Application {
@Override
public void start(Stage stage) {
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("Scene.fxml"));
Parent root = loader.load();
Controller controller = loader.getController();
Scene scene = new Scene(root);

scene.setOnKeyPressed(new EventHandler<KeyEvent>() {



@Override
public void handle(KeyEvent event) {
//System.out.println(event.getCode());
//if I write -> if(controller != null) it doesn't work
switch(event.getCode()) {
case UP:
controller.moveUp();
break;
case DOWN:
controller.moveDown();
break;
case LEFT:
controller.moveLeft();
break;
case RIGHT:
controller.moveRight();
break;
default:
break;

}
}

});

stage.setScene(scene);
stage.show();

} catch(Exception e) {
e.printStackTrace();
}

}

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

package application;


public class Controller {

public void moveUp() {
System.out.println("UP");
}

public void moveDown() {
System.out.println("DOWN");
}

public void moveLeft() {
System.out.println("LEFT");
}

public void moveRight() {
System.out.println("RIGHT");
}

}