In order to use a dialog box to display an alert to the user, you must include the AlertType class.

Name: In order to use a dialog box to display an alert to the user, you must include the AlertType class.
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Quizplus · Accepted Answer

The AlertType class is used to specify the type of alert in JavaFX, but displaying a simple alert dialog box in various programming environments (like JavaScript) does not require explicitly including an AlertType class.

In Order to Use a Dialog Box to Display an Alert