import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

public class Test extends Application {

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

    @Override
    public void start(Stage stage) throws Exception {
        Scene scene = new Scene(new Pane());        
        scene.addEventFilter(KeyEvent.KEY_PRESSED, e -> {
            if (e.getCode() == KeyCode.ALT && e.isAltDown()) {
                System.out.println("CTRL+ALT");
            }
        });
        stage.setScene(scene);
        stage.show();
    }
}

 if (e.getCode() == KeyCode.ALT && e.isShiftDown()) {
        System.out.println("SHIFT+ALT");
 }