radio button lambda javafx

radioButton.selectedProperty().addListener(new ChangeListener<Boolean>() {
    @Override
    public void changed(ObservableValue<? extends Boolean> obs, Boolean wasPreviouslySelected, Boolean isNowSelected) {
        if (isNowSelected) { 
            // ...
        } else {
            // ...
        }
    }
});

// Java Program to create RadioButton and add it to a ToggleGroup 
import javafx.application.Application; 
import javafx.scene.Scene; 
import javafx.scene.control.*; 
import javafx.scene.layout.*; 
import javafx.event.ActionEvent; 
import javafx.event.EventHandler; 
import javafx.collections.*; 
import javafx.stage.Stage; 
import javafx.scene.text.Text.*; 
import javafx.scene.text.*; 
public class radiobutton_1 extends Application { 
    // labels 
    Label l; 
  
    // launch the application 
    public void start(Stage s) 
    { 
        // set title for the stage 
        s.setTitle("creating RadioButton"); 
  
        // create a tile pane 
        TilePane r = new TilePane(); 
  
        // create a label 
        l = new Label("This is a Radiobutton example "); 
  
        // create a toggle group 
        ToggleGroup tg = new ToggleGroup(); 
  
        // create radiobuttons 
        RadioButton r1 = new RadioButton("male"); 
        RadioButton r2 = new RadioButton("female"); 
        RadioButton r3 = new RadioButton("others"); 
  
        // add radiobuttons to toggle group 
        r1.setToggleGroup(tg); 
        r2.setToggleGroup(tg); 
        r3.setToggleGroup(tg); 
  
        // add label 
        r.getChildren().add(l); 
        r.getChildren().add(r1); 
        r.getChildren().add(r2); 
        r.getChildren().add(r3); 
  
        // create a scene 
        Scene sc = new Scene(r, 200, 200); 
  
        // set the scene 
        s.setScene(sc); 
  
        s.show(); 
    } 
  
    public static void main(String args[]) 
    { 
        // launch the application 
        launch(args); 
    } 
}