import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.scene.layout.VBox;
 
public class App extends Application {
 
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage primaryStage) {
        TabPane tabPane = new TabPane();
        Tab tab1 = new Tab("Nevek");
        Tab tab2 = new Tab("Csoportok");
        Tab tab3 = new Tab("Tárgyak");

        tabPane.getTabs().add(tab1);
        tabPane.getTabs().add(tab2);
        tabPane.getTabs().add(tab3);

        VBox vbox = new VBox(tabPane);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.setSpacing(10);

        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.setTitle("Valami");
        primaryStage.show();
    }
}