Anotacia Override pri implementacii metody interfaceu

[Jaroslav Hurdes]

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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