JavaFX 22. RadioButton

1. Main.java

package application;
    
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.fxml.FXMLLoader;
 
 
public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("Main.fxml"));
            Scene scene = new Scene(root);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}
 

2. Main.fxml

<?xml version="1.0" encoding="UTF-8"?>
 
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.RadioButton?>
<?import javafx.scene.control.ToggleGroup?>
<?import javafx.scene.layout.AnchorPane?>
 
 
<AnchorPane prefHeight="500.0" prefWidth="500.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.60" fx:controller="application.MainController">
   <children>
      <RadioButton fx:id="rb1" layoutX="70.0" layoutY="75.0" mnemonicParsing="false" onAction="#radioSelect" selected="true" text="Male">
         <toggleGroup>
            <ToggleGroup fx:id="gender" />
         </toggleGroup>
      </RadioButton>
      <RadioButton fx:id="rb2" layoutX="70.0" layoutY="157.0" mnemonicParsing="false" onAction="#radioSelect" text="Female" toggleGroup="$gender" />
      <Label fx:id="lbl" layoutX="109.0" layoutY="263.0" prefHeight="19.0" prefWidth="294.0" />
   </children>
</AnchorPane>
 

3. MainController.java

package application;
 
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Label;
import javafx.scene.control.RadioButton;
 
public class MainController {
    
    @FXML private RadioButton rb1;
    @FXML private RadioButton rb2;
    @FXML private Label lbl;
    
    public void radioSelect(ActionEvent event){
        String message ="";
        if(rb1.isSelected()){
            message += rb1.getText() + "\n"; 
        }
        if(rb2.isSelected()){
            message += rb2.getText() + "\n"; 
        }
        lbl.setText(message);
    }
}