That's true! But now we'll get into what is possible vs what is idiomatic, common, and supported by the language/stdlib/tooling/libraries/community. If I remember correctly, Rich Hickey did actually do some development for the US census, programming sort of in a Clojure way but in C#, before creating Clojure. But it just looked so alien and was so high-friction that he ended up just creating Clojure. As the article I linked to points out, "at some point, you're just re-implementing Clojure". That being said, it's definitely possible, I just have almost never seen anyone program like that in Java/Scala.