public class EffectTest extends Application {

@Override

    public void start(Stage primaryStage) {

        Group root = new Group();

        Scene scene = new Scene(root, , );

        scene.setOnDragOver((DragEvent event) -> {

            Dragboard db = event.getDragboard();

            if (db.hasFiles()) {

                event.acceptTransferModes(TransferMode.COPY);

            } else {

                event.consume();

            }

        });

        // Dropping over surface

        scene.setOnDragDropped((DragEvent event) -> {

            Dragboard db = event.getDragboard();

            boolean success = false;

            if (db.hasFiles()) {

                success = true;

                String filePath = null;

                for (File file:db.getFiles()) {

                    filePath = file.getAbsolutePath();

                    System.out.println(filePath);

                }

            }

            event.setDropCompleted(success);

            event.consume();

        });

        primaryStage.setScene(scene);

        primaryStage.show();

    }

}