JavaFX: event handling for radio buttons

By adding a ChangeListener to 'toggleGroup' we can receive the events on change in radio button selection.

Ex

toggleGroup.selectedToggleProperty()

.addListener((ObservableValue<? extends Toggle> ov, Toggle old_toggle, Toggle new_toggle) -> {

         if (toggleGroup.getSelectedToggle() != null) {

                  RadioButton radioButton = (RadioButton) toggleGroup.getSelectedToggle();

                  System.out.println("User selected : " + radioButton.getText());

         }

});

Find the below working application.

RadioButtonApp.java

package com.sample.demos;

import java.io.FileNotFoundException;
import java.net.MalformedURLException;

import javafx.application.Application;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.RadioButton;
import javafx.scene.control.Toggle;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class RadioButtonApp extends Application {

 @Override
 public void start(Stage primaryStage) throws FileNotFoundException, MalformedURLException {
  ToggleGroup toggleGroup = new ToggleGroup();

  RadioButton radioButton1 = new RadioButton("Java");
  radioButton1.setToggleGroup(toggleGroup);
  radioButton1.setSelected(true);

  RadioButton radioButton2 = new RadioButton("Python");
  radioButton2.setToggleGroup(toggleGroup);

  RadioButton radioButton3 = new RadioButton("Haskell");
  radioButton3.setToggleGroup(toggleGroup);

  VBox vBox = new VBox(10, radioButton1, radioButton2, radioButton3);
  vBox.setAlignment(Pos.CENTER);

  toggleGroup.selectedToggleProperty()
    .addListener((ObservableValue<? extends Toggle> ov, Toggle old_toggle, Toggle new_toggle) -> {
     if (toggleGroup.getSelectedToggle() != null) {
      RadioButton radioButton = (RadioButton) toggleGroup.getSelectedToggle();

      System.out.println("User selected : " + radioButton.getText());
     }
    });

  Scene scene = new Scene(vBox, 400, 400);

  /* Set the scene to primaryStage, and call the show method */
  primaryStage.setTitle("JavaFX Radio Button Example");
  primaryStage.setScene(scene);
  primaryStage.show();
 }

}

TestFX.java

package com.sample.demos;

import javafx.application.Application;

public class TestFX {
 public static void main(String args[]) {
  Application.launch(RadioButtonApp.class, args);
 }
}

When you ran the application, it opens below window.

Change the radio button selection, you can able to see the selected radio button text in console.

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