"As if coffee" is not the phrase. Also java is just another word for coffee. There's no other substance called 'java' that's in coffee.
"As in" means something like "another way of putting it being ..." / "by which I mean ..."
"... high end java" (excellent coffee), as in "coffee that’s a cut above what you might find in your neighborhood diner" (excellent coffee)
"... high-end java, by which I mean coffee that’s a cut above what you might find in your neighborhood diner."
A: Do you like mice?
B: As in those computer input things?
A: No, as in those small furry animals.
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