Let’s start with the 800lb gorilla in the room, Java. Why Java? Well, let’s start off with the fact that it’s got a ton of community support and documentation everywhere. If you Google a programming problem, chances are within the first three results you will see an example using Java. There is also a plethora of amazing editors available. A good editor is not a replacement for knowing the tools available in a language, but it can help you in learning.
Why should any developer learn more than one programming language?
This is an interesting question. Let’s think of it this way: Does a carpenter only use one type of saw? Does a mechanic only have one type of wrench? No. In short the answer is, as craftsmen of code, we are only as good as the tools that we know how to use; and programming languages are those tools. When it comes down to deciding on what language it is that you want to learn, the question you need to ask yourself is this. What type of developer do I want to be?