Why should a Java developer learn an additional JVM language? [closed]

Question

I am a java developer and I want to know, what is the main benefit from learning a language such as Scala or Groovy?

Answer 1

You can get the same benefit from learning another JVM language as learning any new language. It increases your understanding of programming in general and more importantly, it adds another tool to your toolbox.

So the next time you have to solve a problem, you may reach for a nail gun instead of a hammer.

To be more specific, Groovy is a good language for mocking up code quickly, and Scala, while I've never used it, is suppose to great for writing concurrent applications due to it's functional approach. As others have mentioned, the JVM languages can interact with Java code. Which can be useful for adding onto legacy systems or for mocking up pieces of a application quickly.