Adding a Warning Label

Before we add the sound behavior, let’s add the final visible component: the warning label at the bottom of the window.

This label will always be visible and should clearly tell the user not to click anywhere else in the window. It will be written in red text, centered, and shown at the bottom of the app. Here’s the message we’ll display:

Select the radio buttons or the slider only.
You'll hear a warning sound if the mouse is clicked elsewhere!

Create the Warning Label

We’ll create a new Label and give it two lines of text using \n. We’ll also:

• Set the text color to red using setTextFill(...)

• Make it bold and readable with a smaller font size than the main instruction label

• Center the lines within the label using setTextAlignment(...)

Label warningLabel = new Label(
    "Select the radio buttons or the slider only.\n" +
    "You'll hear a warning sound if the mouse is clicked elsewhere!"
);
warningLabel.setTextFill(Color.RED);
warningLabel.setFont(Font.font("System", FontWeight.BOLD, 14));
warningLabel.setTextAlignment(TextAlignment.CENTER);