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In this JavaFX example, we will see how to use the JavaFX RadioButton control with an example.

RadioButton is usually used to create a mutually exclusive series of items. Only one RadioButton can be selected when placed in a ToggleGroup. When a RadioButton is selected an ActionEvent is sent.

The JavaFX RadioButton is represented by the class javafx.scene.control.RadioButton. 

JavaFX RadioButton Example

The example has three radio buttons. By placing them in a toggle group, only one of them can be selected at a time.

package sample;

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

public class Main extends Application {

    private final double BORDER = 10d;
    private Label lbl2;

    @Override
    public void start(Stage stage) {

        initUI(stage);
    }

    private void initUI(Stage stage) {

        var root = new AnchorPane();

        var vbox = new VBox(10);
        vbox.setPadding(new Insets(10));

        var lbl1 = new Label("Difficulty");

        lbl2 = new Label("");
        lbl2.setStyle("-fx-background-color:wheat; -fx-padding: 0 0 0 5");
        lbl2.prefWidthProperty().bind(stage.widthProperty().subtract(2 * BORDER));

        var tg = new ToggleGroup();
        tg.selectedToggleProperty().addListener(new MyToggleListener());

        var rb1 = new RadioButton("Easy");
        rb1.setToggleGroup(tg);
        rb1.setSelected(true);

        var rb2 = new RadioButton("Medium");
        rb2.setToggleGroup(tg);

        var rb3 = new RadioButton("Hard");
        rb3.setToggleGroup(tg);

        vbox.getChildren().addAll(lbl1, rb1, rb2, rb3);
        root.getChildren().addAll(vbox, lbl2);

        AnchorPane.setTopAnchor(vbox, BORDER);
        AnchorPane.setBottomAnchor(lbl2, BORDER);
        AnchorPane.setLeftAnchor(lbl2, BORDER);

        var scene = new Scene(root, 300, 250);

        stage.setTitle("RadioButton");
        stage.setScene(scene);
        stage.show();
    }

    private class MyToggleListener implements ChangeListener<Toggle> {

        @Override
        public void changed(ObservableValue<? extends Toggle> observable,
                            Toggle oldValue, Toggle newValue) {

            var rb = (RadioButton) newValue;
            String txt = rb.getText();
            lbl2.setText(txt);
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

Output:

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2. JavaFX ColorPicker Example
3. JavaFX DatePicker Example
4. JavaFX MenuBar Example
5. JavaFX Radio Button Example
6. JavaFX TabPane Example
7. JavaFX Accordion Example
8. JavaFX Login Form Validation Example
9. JavaFX Form Validation - Registration Form Validation Example
10. JavaFX Line Chart Example
11. JavaFX Area Chart Example
12. JavaFX Scatter Chart Example
13. JavaFX Bar Chart Example
14. JavaFX Pie Chart Example
15. JavaFX Select and Multi-Select Example
16. JavaFX Check Box Example
17. Java Calculator Project