I am reading the book Java Concurrency in Practice and getting a little bit confused with these terms:
Can someone please explain me them (with an example, if it's possible)?
You'll have a lot of problems writing Java, especially multi-threaded code, if you can't understand these simple ideas:
They're all part of an idea called "programming by contract". It was invented by a guy named C.A.R. Hoare. Bertrand Meyer built an object oriented language called Eiffel around it. No one uses it much, but he had a day in the sun because of it.
Eiffel isn't very popular. There are over four million questions on SO as I write this, but only 32 of them are tagged "eiffel".
Update: There were 11,966,392 question on SO on 29-Jun-2016. Only 92 of them were tagged "eiffel". The percentage of Eiffel questions is staying roughly constant at ~0.00077%.
I stand corrected - thank you, flamingpenguin. I've updated my answer.
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