Question 1

Explain what would happen if the ToggleGroup had not been set on the radio buttons used in the QuoteOptions program.

These are the classes from that example:

QuoteOptions.java

public class QuoteOptions extends Application {

    public void start(Stage primaryStage) {
        QuoteOptionsPane pane = new QuoteOptionsPane();
        pane.setAlignment(Pos.CENTER);
        pane.setStyle("-fx-background-color: lightgreen");

        Scene scene = new Scene(pane, 500, 150);

        primaryStage.setTitle("Quote Options");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

QuoteOptionsPane.java

public class QuoteOptionsPane extends HBox {

    private Text quote;
    private String philosophyQuote, carpentryQuote, comedyQuote;
    private RadioButton philosophyButton, carpentryButton, comedyButton;

    public QuoteOptionsPane() {
        // Quote strings
        philosophyQuote = "I think, therefore I am.";
        carpentryQuote = "Measure twice. Cut once.";
        comedyQuote = "Take my wife, please.";

        // Text element
        quote = new Text(philosophyQuote);
        quote.setFont(new Font("Helvetica", 24));

        StackPane quotePane = new StackPane(quote);
        quotePane.setPrefSize(300, 100);

        // Toggle group for radio buttons
        ToggleGroup group = new ToggleGroup();

        philosophyButton = new RadioButton("Philosophy");
        philosophyButton.setSelected(true);
        philosophyButton.setToggleGroup(group);
        philosophyButton.setOnAction(this::processRadioButtonAction);

        carpentryButton = new RadioButton("Carpentry");
        carpentryButton.setToggleGroup(group);
        carpentryButton.setOnAction(this::processRadioButtonAction);

        comedyButton = new RadioButton("Comedy");
        comedyButton.setToggleGroup(group);
        comedyButton.setOnAction(this::processRadioButtonAction);

        // Layout the radio buttons vertically
        VBox options = new VBox(philosophyButton, carpentryButton, comedyButton);
        options.setAlignment(Pos.CENTER_LEFT);
        options.setSpacing(10);

        setSpacing(20);
        getChildren().addAll(options, quotePane);
    }

    public void processRadioButtonAction(ActionEvent event) {
        if (philosophyButton.isSelected()) {
            quote.setText(philosophyQuote);
        } else if (carpentryButton.isSelected()) {
            quote.setText(carpentryQuote);
        } else {
            quote.setText(comedyQuote);
        }
    }
}