Swing is swing, it's as good as it's always been (eye of the beholder). As I understand it, it hasn't completely rotted on the shelf, they've made updates to the rendering to better leverage modern hardware, but it's not a modern toolkit by any means. But it is maintained, it still works.
JavaFX is good (I really like FX), and maintained, and portable. They just came out with 25 I think. But it's a completely different model than Swing.
