If you look at companies they're all quite different though. Apple uses a lot of languages. Google uses a lot of C++. Facebook is a combination of things, but AFAIK their main platform is still written in Hack. Netflix is probably still mostly Java. Uber is Python + Go.
I honestly think Java is going to come back in fashion at some point after all the recent updates, along with all the newer JVM languages ala Scala, Clojure, and Kotlin.
If you're asking this for "what language should I learn?" I think knowing anything typed + Python is an extremely strong combo.