With JavaFX, you can build a really nice graphics-based UI more quickly and easily than using Swing, for example.
Another recent
post referenced this Swing demo program:
Launch TransformerDemo
With JavaFX, you can easily implement the 3 transformer sliders by binding properties of any objects to the slider values. So, to hook up a rectangle to 3 sliders that control angle, scale, and shear you use the transforms property:
Any Node (including UI controls) can be transformed.
You can also provide effects, animation, and manipulate a 2D graphics space.
You can still leverage your Java knowledge, since calling Java APIs is totally transparent.
JavaFX is easy to learn and its declarative style makes code concise and easy to read, as the above example hopefully shows.
I would urge you to check out JavaFX and see if you like it!