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This post doesn't claim to teach you about programming language. It actually contains exactly what it says on the tin: Hello World in every programming language.

When you pick up a dictionary, do you groan about it teaching you nearly nothing about human languages?

This IMHO is better https://learnxinyminutes.com/[0] if you want to see how the language looks like, because indeed "hello world" usually tells absolutely nothing.

[0] https://github.com/adambard/learnxinyminutes-docs

I like http://rosettacode.org

Java 9 will have 'interactive shell' functionality, 1:40 of the video (on the linked page) they show hello world.

https://blogs.oracle.com/java/entry/jshell_and_relp_in_java

Not really, when learning the language, most people will see it just as "stuff you do to make a main function". It's just as you don't have to look inside stdio.h to be able to #include it for a hello world program.