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  • I was under the impression code that doesn't work = SO, code that works but needs review = CodeReview, general questions that may or may not need code = programmers. My code does actually work and is only there as an example. I'm not asking for a review, either, just asking about semantics. Commented Aug 24, 2014 at 17:30
  • ..asking about the semantics of something is not a conceptual question? Commented Aug 24, 2014 at 17:36
  • I think this is a conceptual question, not as conceptual as other good questions on this site but it is not about implementation. The code works, the question is not about the code. The question is asking "what is the difference between these two interfaces?" Commented Aug 24, 2014 at 18:14
  • Why would you want to switch from C# to Java! Commented Feb 3, 2016 at 19:24
  • 2
    There is one difference, namely that Callable.call() throws exceptions and Supplier.get() doesn't. That makes the latter much more attractive in lambda expressions. Commented Aug 23, 2016 at 8:02