https://openjdk.java.net/projects/openjfx/javafx-graphics/: OpenJFX JavaFX
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public interface javafx.application.Preloader$PreloaderNotification
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javafx.application.Preloader$PreloaderNotification
  super_class: java.lang.Object
{
}
SourceFile: "Preloader.java"
NestHost: javafx.application.Preloader
InnerClasses:
  public abstract PreloaderNotification = javafx.application.Preloader$PreloaderNotification of javafx.application.Preloader