import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.VBox;
 
public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage primaryStage) throws Exception {
        final ToggleGroup group1 = new ToggleGroup();        
        RadioButton radio1 = new RadioButton("Emese");
        RadioButton radio2 = new RadioButton("Béla");
        Button button1 = new Button("Választ");
        
        radio1.setToggleGroup(group1);
        radio2.setToggleGroup(group1);        
        
        button1.setOnAction(e -> {
            String valasztott = "";
            if(radio1.isSelected()) {
                valasztott = "Emese";
            }else {
                valasztott = "Béla";
            }
            System.out.println("Választott: " + valasztott);
        });
 
        VBox vbox = new VBox(10);
        vbox.setPadding(new Insets(10, 10, 10, 10));
        vbox.getChildren().addAll(radio1, radio2, button1);
 
        Scene scene = new Scene(vbox, 300, 250);
        primaryStage.setScene(scene);
 
        primaryStage.show();
    }
 
}