I'd been doing Java since '97 (even taught it), and I know so little about it now that I don't even try do it anymore. Same with C++ (since '93, on & off after starting Java). Now it's almost(?) easier to pick up a new language than to keep up-to-date with the old.
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Oh yeah. Especially C++. I can learn 5 new languages pretty well in the time it takes to refresh my c++ chops.
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I am always amazed how the promise of "do not worry about memory management" turns every seasoned Java perf engineer into an expert on GC tuning. I can so relate to that feeling.
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That's called "Dunning-Kruger effect"



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In some cases it's helpful, because it keeps you from getting discouraged until you gain some real knowledge and depth on a subject.
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hahah, right? When people ask me if I know Java, I tell them: I do, but you don't want me to write your Java code lol
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We once had an interviewee rating himself as 9/10... It didn't end well
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