Pouziti anotace pri implementaci metody z rozhrani je v rozporu se
specifikaci (JLS, str. 279):
"Note that if a method overrides a method from a superinterface but not
from a superclass, using @Override will cause a compile-time error."
Tj. pokud ji tam nejaky program vyzaduje, lze to povazovat za bug.
(Moje NetBeans 6.8 ji nevyzaduji.)
Z.T.
--
Zdenek Tronicek
FIT CTU in Prague
Jaroslav Hurdes napsal(a):
> Co se tyce toho, zda tuto anotaci pouzivat, tak jsem nekde cetl a
> souhlasim s tim, ze je dobre ji pouzivat. Tato anotace vam zajisti
> kontrolu nad tim, zda dana metoda opravdu prekryva metodu predka. U
> implementace rozhrani to neni az tak dulezite, jelikoz v pripade zmeny
> rozhrani vam kompilator vyhodi chybu tak jako tak, ze metoda neni
> implementovana. Jina situace je ale v pripade, ze prekryvame metodu od
> predka a pocitame s tim, ze se bude volat ta prekryta metoda. v pripade,
> ze dojde ke zmene v implementaci u potomka (prida se parametr, zmeni se
> typ parametru) tak se nemusi tato zmena projevit jako chyba v okoli
> daneho objektu, ktere jej vyuziva, ale fakticky to bude delat neco
> jineho, nez se puvodne predpokladalo (bude se volat metoda predka a ne
> ta prekryta). Tato anotace nam zajisti vyhozeni chyby, ze metoda jiz
> neni prepisem jine metody, ale ze mame dve samostatne metody.
>
> Jaroslav Hurdes
>
> Dne 8.3.2010 16:27, Marian Stevlik napsal(a):
>> Hi all,
>>
>> Chcel by som sa spytat, ci sa ma uvadzat anotacia @Override nad
>> implementaciou metody interfaceu?
>> Ide o Javu 1.6
>>
>> Priklad:
>>
>> public interface NejakyInterface {
>>
>> public void nejakaMetoda();
>>
>> }
>>
>> public class NejakyInterfaceImpl implements NejakyInterface {
>>
>> @Override // Anotacia ano ci nie?
>> public void nejakaMetoda() {
>> // nejaky kod
>> }
>>
>> }
>>
>> Pytam sa preto, bo NetBeans 6.8 mi davaju warning, ze by tam anotacia
>> mala byt, ale Eclipse Galileo mi tam potom hadzu chybu a odporucaju
>> anotaciu vymazat.
>>
>> Michal
>>
>>
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