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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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