Copy DayNightToggleButton.java and style.css in your Java FX Project. Be sure that you have a Java JDK installed which includes JavaFX.

TestFX 4 requires Java version of 8 (1.8), or higher, and has only legacy support. A fluent and clean API. Flexible setup and cleanup of JavaFX test fixtures. Simple ...

The key difference between Swing vs. JavaFX is that JavaFX is an actively maintained Java project that supports the development of modern, feature-rich GUI applications, while Swing is an older ...

There are several places within the JavaFX 2 documentation that the sample application Ensemble is referenced. Ensemble is the largest JavaFX sample application provided in the JavaFX 2.0 samples.