Sadly, Java (and C#) runs serious company software, not smartphone/tablet toys as dumb remote clients.

Also, Android dominates the world. Call it weird Java, because it's actually that.

I'd love everyone shifted to Go, but that won't happen soon.

Java it's a bit like Cobol, surviving because of legacy needs; but contrary to Cobol everyone can get a JDK and start programming in no time in any OS and with tons of documentation and support.

And I don't actually like Java, but things in real life work like that. If some serious company needs a middleware or management software, your bets will be either on Java or the weird cousing, C# where a programmer can get in no time from the former.

Go shines on (micro)services and everything concurrent.