I googled this question but didn't find any information about it. Can I use "I will have had something by 2016" when I want to say that I will own this when 2016 begin?
You can say it, but you will probably get an astonished reaction. Why use such a complicated tense as F2 (future perfect) when a short "I'll" would be sufficient
- I'll have my diploma by 2016.
F2 is used very seldom and if it is used it is not used as the Latin Futur II is used. Simply because jumping to a time point in the future and looking backwards to say what has been done then is a very complicated thing, not appropriate for normal language.
As to F2 you have to study when it is used. But that is no urgent problem for a learner.