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    +1 for mentioning Design by Contract. If you can't completely prohibit behavior (and that's hard to do) at least you make clear that there are no guarantees on bad behavior. I also like throwing an IllegalStateException or an UnsupportedOperationException. Commented Dec 4, 2013 at 22:03
  • @user949300 Sure. I like to believe such exceptions were introduced with a meaningful purpose. Honoring contracts seems to fit such role. Commented Dec 4, 2013 at 22:34