Can Kotlin create something like Java GUI / SWING?

Sure can: #tornadofx

Ian, why I can't find any relevant video via Google Search? 😞

Several here: https://www.youtube.com/user/MrEdvinsyse/videos

Thank you!

TornadoFX wraps JavaFX, so see tutorials on that as well. E.g.: https://www.youtube.com/playlist?list=PL6gx4Cwl9DGBzfXLWLSYVy8EbTdpGbUIG

And a more general point: everything you can do in Java is possible in Kotlin as well, eg. in this case you could just use JavaFX but #tornadofx makes it even easier.