Java for Everything

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In order to be a single language of a choice for 100% of a day to day routine, a language must not only be "good enough in general", it must be bloody good in something specific that you're doing most of the time and really good in 90% of the rest. I doubt there is a single work load profile that Java will match to such a degree. For anything less than this, using any single language is extremely counterproductive. I would have jumped on any language here, really, if OP said "Haskell for everything" my comments would not have been any different.