Swing covers almost every use case (JavaFX as well and has a more modern feel). While people like to complain about Java, it is easy to follow and gets the job

Swing covers almost every use case (JavaFX as well and has a more modern feel). While people like to complain about Java, it is easy to follow and gets the job done. Other languages are available on the JVM that could also leverage Swing/JavaFX, like Clojure.