Hammers and Monoculture

I get nervous when I ask someone what they do and they say "I am a Java programmer". Because that's kind of like asking a builder what they do and they say "Hammers". They are all tools and we should as professionals use the appropriate tools for the job. The real danger I see right now with programming languages and developers is this idea of monocultures [...] I strongly encourage developers to diversify. -- Pragmatic Dave, InfoQ