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restaurantorderapp's Issues
IkinciYemekAlimActivity newInstance -> newIntent
newInstance fragment yaratirken kullaniliyor. Fragmentin instance' ini yaratiyorsun.
Activity de Intent yaratiyorsun o yuzden method adinin "newIntent" olmasi gerekiyor.
IkinciYemekAlimActivity private SIPARIS
public static final String SIPARIS = "siparis";
Guzel haraket. Tek eksik public
olmasi. ilk issue daki "access modifier" konusu burada da var. private olmasi gerekiyor.
IkinciYemekAlimActivity
startActivity(UcuncuYemekAlimActivity.newInstance(this, new ArrayList<Siparis>(siparisList)));
Burada siparisList dogrudan methoda verilebilir. Her new
dediginde memoryden yiyosun. Objelerin ozellikle farkli olmalari gerekmedikce new kullanmamak gerek.
BirinciYemekAlimActivity List<Siparis> siparisList;
Classlar icinde degisken (variable) tanimlarken, o variable'a nerelerden ulasilabilecegini de tanimlamak faydali bir kodlama pratigidir. Ne kadar az yerden ulasilabilinirse o kadar iyi. (encapsulation)
Bunun icin javada "access modifier"lar var.
1- public
2- protected
3- private
4- "hicbirsey yazmadigin durum" (package private)
Bunlari arastir. Aklinda hep "Eger baska yerde kullanilmiyorsa 'private' yapmam gerekiyor." olsun.
Kisacasi; private List<Siparis> siparisList;
olarak tanimlaman gerekiyor.
Dip not: Access modifier'lari sadece classlarin icerisindeki variable'larda kullanabilirsin. Methodlarin icinde tanimladigin variable'larda kullanamazsin.
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