If, instead of Swing, you use JavaFx (which comes included with Java) your UI will look nicer. It even has an embedded Webkit browser that can easily interact w

If, instead of Swing, you use JavaFx (which comes included with Java) your UI will look nicer. It even has an embedded Webkit browser that can easily interact with JVM code. This means you can program your UI in any HTML/CSS/JS framework you want, and any other logic in any JVM language (Java, Scala, Groovy, Clojure, Kotlin, Ceylon, Frege, etc.)