{"id":37869,"date":"2026-01-17T14:40:41","date_gmt":"2026-01-17T11:40:41","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=37869"},"modified":"2026-01-17T14:40:41","modified_gmt":"2026-01-17T11:40:41","slug":"javada-public-static-void-mainstring-args-yapisini-anlamak","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javada-public-static-void-mainstring-args-yapisini-anlamak\/","title":{"rendered":"Java’da public static void main(String[] args) Yap\u0131s\u0131n\u0131 Anlamak"},"content":{"rendered":"

<\/p>\n

Java’da public static void main(String[] args) Yap\u0131s\u0131n\u0131 Anlamak<\/h2>\n

Giri\u015f<\/h2>\n

Java programlama d\u00fcnyas\u0131na ad\u0131m atan herkesin ilk kar\u015f\u0131la\u015ft\u0131\u011f\u0131 ve belki de en temel ama bir o kadar da kritik yap\u0131 ta\u015flar\u0131ndan biri, \u015f\u00fcphesiz public static void main(String[] args)<\/code> metodudur. Bu metot, her Java uygulamas\u0131n\u0131n ba\u015flang\u0131\u00e7 noktas\u0131, kalbi ve beynidir. Bir Java program\u0131n\u0131n nas\u0131l \u00e7al\u0131\u015fmaya ba\u015flad\u0131\u011f\u0131n\u0131, hangi kod blo\u011funun ilk olarak y\u00fcr\u00fct\u00fcld\u00fc\u011f\u00fcn\u00fc ve Java Sanal Makinesi’nin (JVM) bir uygulamay\u0131 nas\u0131l ba\u015flatt\u0131\u011f\u0131n\u0131 anlamak i\u00e7in bu metodun her bir bile\u015fenini derinlemesine kavramak \u015fartt\u0131r. Ba\u015flang\u0131\u00e7ta ezberlenmesi gereken bir kal\u0131p gibi g\u00f6r\u00fcnse de, her anahtar kelimenin ve parametrenin ard\u0131nda yatan mant\u0131k, Java’n\u0131n mimarisini ve \u00e7al\u0131\u015fma prensiplerini anlamak i\u00e7in temel bir anahtard\u0131r. Bu makalede, public static void main(String[] args)<\/code> yap\u0131s\u0131n\u0131n her bir par\u00e7as\u0131n\u0131 ayr\u0131 ayr\u0131 ele alacak, neden bu \u015fekilde tasarland\u0131\u011f\u0131n\u0131 a\u00e7\u0131klayacak ve Java programlar\u0131n\u0131n nas\u0131l hayat buldu\u011funu detayl\u0131 bir \u015fekilde inceleyece\u011fiz.<\/p>\n

public static void main(String[] args) Yap\u0131s\u0131n\u0131n Detayl\u0131 Analizi<\/h2>\n

Java’da bir program\u0131n \u00e7al\u0131\u015fmaya ba\u015flamas\u0131 i\u00e7in JVM’in belirli bir giri\u015f noktas\u0131na ihtiyac\u0131 vard\u0131r. Bu giri\u015f noktas\u0131, standart olarak main<\/code> ad\u0131n\u0131 ta\u015f\u0131yan ve belirli bir imzaya sahip olan bir metottur. Bu imza, public static void main(String[] args)<\/code> \u015feklindedir. \u015eimdi bu imzan\u0131n her bir bile\u015fenini tek tek inceleyelim.<\/p>\n

public Anahtar Kelimesi<\/h3>\n

public<\/code> anahtar kelimesi, Java’daki bir eri\u015fim belirleyicisidir (access modifier). Bir metodun public<\/code> olarak i\u015faretlenmesi, o metoda projenin herhangi bir yerinden, yani ba\u015fka bir paketten, s\u0131n\u0131ftan veya alt s\u0131n\u0131ftan eri\u015filebilece\u011fi anlam\u0131na gelir. main<\/code> metodunun public<\/code> olmas\u0131 zorunludur \u00e7\u00fcnk\u00fc Java Sanal Makinesi (JVM), uygulamay\u0131 ba\u015flat\u0131rken bu metoda d\u0131\u015far\u0131dan eri\u015febilmelidir. E\u011fer main<\/code> metodu public<\/code> olmasayd\u0131 (\u00f6rne\u011fin private<\/code> veya protected<\/code> olsayd\u0131), JVM bu metoda eri\u015femez ve program\u0131 ba\u015flatamazd\u0131.<\/p>\n

Eri\u015fim belirleyicileri, Java’da kaps\u00fclleme (encapsulation) prensibinin temelini olu\u015fturur ve kodun g\u00fcvenli\u011fini, bak\u0131m\u0131n\u0131 ve yeniden kullan\u0131labilirli\u011fini art\u0131r\u0131r. public<\/code>, en geni\u015f eri\u015fim seviyesini sunar. Di\u011fer eri\u015fim belirleyicileri ise \u015funlard\u0131r:
\n* private<\/code>: Yaln\u0131zca tan\u0131mland\u0131\u011f\u0131 s\u0131n\u0131f i\u00e7erisinden eri\u015filebilir.
\n* protected<\/code>: Tan\u0131mland\u0131\u011f\u0131 s\u0131n\u0131f, ayn\u0131 paketteki di\u011fer s\u0131n\u0131flar ve farkl\u0131 paketteki alt s\u0131n\u0131flar taraf\u0131ndan eri\u015filebilir.
\n* default<\/code> (belirtilmedi\u011finde): Yaln\u0131zca ayn\u0131 paket i\u00e7erisindeki s\u0131n\u0131flar taraf\u0131ndan eri\u015filebilir.
\nmain<\/code> metodunun public<\/code> olmas\u0131, JVM’in onu bir “kap\u0131” gibi kullanarak uygulamaya giri\u015f yapmas\u0131n\u0131 sa\u011flar. Bu, Java’n\u0131n platform ba\u011f\u0131ms\u0131zl\u0131\u011f\u0131 ve g\u00fcvenlik mimarisinin bir par\u00e7as\u0131d\u0131r.<\/p>\n

static Anahtar Kelimesi<\/h3>\n

static<\/code> anahtar kelimesi, Java’da bir metodun veya de\u011fi\u015fkenin bir s\u0131n\u0131fa ait oldu\u011funu, belirli bir nesneye ait olmad\u0131\u011f\u0131n\u0131 belirtir. main<\/code> metodunun static<\/code> olmas\u0131, onu \u00e7a\u011f\u0131rmak i\u00e7in s\u0131n\u0131f\u0131n bir \u00f6rne\u011finin (nesnesinin) olu\u015fturulmas\u0131na gerek olmad\u0131\u011f\u0131 anlam\u0131na gelir. Java program\u0131 ba\u015flad\u0131\u011f\u0131nda, JVM hen\u00fcz hi\u00e7bir s\u0131n\u0131f\u0131n nesnesini olu\u015fturmam\u0131\u015ft\u0131r. E\u011fer main<\/code> metodu static<\/code> olmasayd\u0131, JVM \u00f6ncelikle s\u0131n\u0131f\u0131n bir nesnesini olu\u015fturmak zorunda kalacak, sonra bu nesne \u00fczerinden main<\/code> metodunu \u00e7a\u011f\u0131racakt\u0131. Bu durum, bir “tavuk mu yumurtadan, yumurta m\u0131 tavuktan” ikilemine yol a\u00e7ard\u0131.<\/p>\n

static<\/code> bir metot do\u011frudan s\u0131n\u0131f ad\u0131 \u00fczerinden \u00e7a\u011fr\u0131labilir. \u00d6rne\u011fin, MyClass.main(args)<\/code> \u015feklinde. JVM de tam olarak bu \u015fekilde hareket eder. S\u0131n\u0131f\u0131 belle\u011fe y\u00fckledikten sonra, do\u011frudan s\u0131n\u0131f ad\u0131 \u00fczerinden main<\/code> metodunu \u00e7a\u011f\u0131r\u0131r. static<\/code> metodlar\u0131n bir di\u011fer \u00f6nemli \u00f6zelli\u011fi, this<\/code> anahtar kelimesini kullanamamalar\u0131d\u0131r, \u00e7\u00fcnk\u00fc this<\/code> anahtar kelimesi o anki nesneyi temsil eder ve static<\/code> metodlar herhangi bir nesneye ba\u011fl\u0131 de\u011fildir. Ayr\u0131ca, static<\/code> metodlar yaln\u0131zca static<\/code> de\u011fi\u015fkenlere ve di\u011fer static<\/code> metodlara do\u011frudan eri\u015febilirler. Non-static (\u00f6rnek) \u00fcyelere eri\u015fmek i\u00e7in s\u0131n\u0131f\u0131n bir nesnesini olu\u015fturmak zorundad\u0131rlar. main<\/code> metodunun static<\/code> olmas\u0131, JVM’in program\u0131 ba\u015flat\u0131rken basit ve do\u011frudan bir mekanizma kullanmas\u0131n\u0131 sa\u011flar.<\/p>\n

void Anahtar Kelimesi<\/h3>\n

void<\/code> anahtar kelimesi, bir metodun herhangi bir de\u011fer d\u00f6nd\u00fcrmedi\u011fini belirtir. main<\/code> metodunun void<\/code> olmas\u0131, JVM’e program\u0131n ba\u015far\u0131yla tamamland\u0131\u011f\u0131n\u0131 veya bir hata ile sonland\u0131\u011f\u0131n\u0131 do\u011frudan bir d\u00f6n\u00fc\u015f de\u011feriyle bildirmesine gerek olmad\u0131\u011f\u0131n\u0131 ifade eder. Program\u0131n y\u00fcr\u00fct\u00fclmesi tamamland\u0131\u011f\u0131nda, JVM kontrol\u00fc i\u015fletim sistemine geri verir. \u0130\u015fletim sistemi, Java s\u00fcrecinin (process) \u00e7\u0131k\u0131\u015f kodunu kontrol ederek program\u0131n ba\u015far\u0131 durumunu anlayabilir.<\/p>\n

Geleneksel olarak, bir\u00e7ok programlama dilinde main<\/code> fonksiyonlar\u0131 bir tam say\u0131 (integer) de\u011feri d\u00f6nd\u00fcr\u00fcr. \u00d6rne\u011fin, C\/C++’ta int main()<\/code> genellikle 0 d\u00f6nd\u00fcrerek ba\u015far\u0131l\u0131 tamamlanmay\u0131, di\u011fer de\u011ferleri ise hata durumlar\u0131n\u0131 belirtir. Java’da ise bu sorumluluk System.exit(int status)<\/code> metoduna b\u0131rak\u0131lm\u0131\u015ft\u0131r. Geli\u015ftiriciler, program\u0131n belirli bir durumla sonlanmas\u0131n\u0131 istediklerinde bu metodu kullanarak i\u015fletim sistemine bir \u00e7\u0131k\u0131\u015f kodu (status code) bildirebilirler. \u00d6rne\u011fin, System.exit(0)<\/code> ba\u015far\u0131l\u0131 bir sonlanmay\u0131, System.exit(1)<\/code> veya di\u011fer pozitif de\u011ferler ise bir hata durumunu g\u00f6sterir. main<\/code> metodunun void<\/code> olmas\u0131, Java’n\u0131n daha y\u00fcksek seviyeli ve nesne odakl\u0131 bir dil olmas\u0131ndan kaynaklanan bir tasar\u0131m tercihidir; program\u0131n ya\u015fam d\u00f6ng\u00fcs\u00fc ve \u00e7\u0131k\u0131\u015f y\u00f6netimi i\u00e7in ayr\u0131 bir mekanizma sunulmu\u015ftur.<\/p>\n

main Metot Ad\u0131<\/h3>\n

main<\/code> kelimesi, Java Sanal Makinesi (JVM) taraf\u0131ndan bir Java uygulamas\u0131n\u0131n ba\u015flang\u0131\u00e7 noktas\u0131 olarak tan\u0131nan \u00f6zel bir metot ad\u0131d\u0131r. Bu isim, bir kural (convention) olmaktan \u00f6te, JVM’in program\u0131 ba\u015flatmak i\u00e7in arad\u0131\u011f\u0131 kesin bir tan\u0131mlay\u0131c\u0131d\u0131r. JVM, bir s\u0131n\u0131f\u0131 y\u00fckledi\u011finde, public static void<\/code> imzas\u0131na sahip ve ad\u0131 main<\/code> olan bir metodu arar. E\u011fer bu metot bulunamazsa, JVM bir hata (\u00f6rne\u011fin NoSuchMethodError<\/code> veya benzeri) verir ve program\u0131 ba\u015flatamaz.<\/p>\n

main<\/code> metodu, Java’da overload edilebilir (a\u015f\u0131r\u0131 y\u00fcklenebilir). Yani, ayn\u0131 s\u0131n\u0131fta farkl\u0131 parametre listelerine sahip birden fazla main<\/code> metodu tan\u0131mlayabilirsiniz. \u00d6rne\u011fin:<\/p>\n

class MyClass {\n    public static void main(String[] args) {\n        System.out.println(\"Ana main metodu \u00e7al\u0131\u015ft\u0131.\");\n    }\n\n    public static void main(int arg) {\n        System.out.println(\"Overload edilmi\u015f main metodu (int): \" + arg);\n    }\n\n    public static void main(String arg1, String arg2) {\n        System.out.println(\"Overload edilmi\u015f main metodu (String, String): \" + arg1 + \", \" + arg2);\n    }\n}<\/code><\/pre>\n
Ancak, JVM program\u0131 ba\u015flat\u0131rken her zaman ve yaln\u0131zca public static void main(String[] args)<\/code> imzas\u0131na sahip metodu \u00e7a\u011f\u0131r\u0131r. Di\u011fer main<\/code> metodlar\u0131, s\u0131n\u0131f i\u00e7erisindeki di\u011fer metodlar gibi normal bir \u015fekilde \u00e7a\u011fr\u0131labilir, ancak bir uygulaman\u0131n giri\u015f noktas\u0131 olarak kullan\u0131lamazlar. Bu durum, JVM’in program ba\u015flatma s\u00fcrecindeki kesinlik ve \u00f6ng\u00f6r\u00fclebilirlik ihtiyac\u0131ndan kaynaklan\u0131r.<\/p>\n
(String[] args) Parametresi<\/h3>\n
(String[] args)<\/code> k\u0131sm\u0131, main<\/code> metodunun ald\u0131\u011f\u0131 tek parametredir. Bu parametre, komut sat\u0131r\u0131ndan programa ge\u00e7irilen arg\u00fcmanlar\u0131 (ba\u011f\u0131ms\u0131z de\u011fi\u015fkenleri) tutan bir String<\/code> dizisidir. Kullan\u0131c\u0131lar, Java programlar\u0131n\u0131 \u00e7al\u0131\u015ft\u0131r\u0131rken programa ek bilgiler veya yap\u0131land\u0131rma parametreleri sa\u011flayabilirler. Bu arg\u00fcmanlar, main<\/code> metodunun args<\/code> dizisi arac\u0131l\u0131\u011f\u0131yla programa iletilir.<\/p>\n
\u00d6rne\u011fin, MyProgram<\/code> ad\u0131nda bir Java s\u0131n\u0131f\u0131n\u0131z oldu\u011funu varsayal\u0131m:<\/p>\n
class MyProgram {\n    public static void main(String[] args) {\n        System.out.println(\"Ge\u00e7irilen arg\u00fcman say\u0131s\u0131: \" + args.length);\n        for (int i = 0; i < args.length; i++) {\n            System.out.println(\"Arg\u00fcman \" + (i + 1) + \": \" + args[i]);\n        }\n    }\n}<\/code><\/pre>\n
Bu program\u0131 komut sat\u0131r\u0131ndan a\u015fa\u011f\u0131daki gibi \u00e7al\u0131\u015ft\u0131r\u0131rsan\u0131z:
\njava MyProgram ilkArguman ikinciArguman \"\u00fc\u00e7\u00fcnc\u00fc arg\u00fcman\"<\/code><\/p>\n
Program\u0131n \u00e7\u0131kt\u0131s\u0131 \u015f\u00f6yle olacakt\u0131r:<\/p>\n
Ge\u00e7irilen arg\u00fcman say\u0131s\u0131: 3\nArg\u00fcman 1: ilkArguman\nArg\u00fcman 2: ikinciArguman\nArg\u00fcman 3: \u00fc\u00e7\u00fcnc\u00fc arg\u00fcman<\/code><\/pre>\n
Burada, args<\/code> dizisi s\u0131ras\u0131yla \"ilkArguman\"<\/code>, \"ikinciArguman\"<\/code> ve \"\u00fc\u00e7\u00fcnc\u00fc arg\u00fcman\"<\/code> de\u011ferlerini i\u00e7erir. Komut sat\u0131r\u0131ndaki bo\u015fluklar arg\u00fcmanlar\u0131 ay\u0131r\u0131r; e\u011fer bir arg\u00fcman bo\u015fluk i\u00e7eriyorsa, t\u0131rnak i\u015faretleri i\u00e7ine al\u0131nmal\u0131d\u0131r.<\/p>\n
Bu parametre, programlara dinamik davran\u0131\u015f kazand\u0131rmak i\u00e7in \u00e7ok \u00f6nemlidir. \u00d6rne\u011fin, bir dosya yolunu, bir veritaban\u0131 ba\u011flant\u0131 dizesini, bir konfig\u00fcrasyon parametresini veya bir i\u015flem modunu komut sat\u0131r\u0131ndan ge\u00e7irmek i\u00e7in kullan\u0131labilir. Bu sayede, ayn\u0131 program farkl\u0131 senaryolar veya ortamlar i\u00e7in farkl\u0131 \u015fekillerde \u00e7al\u0131\u015ft\u0131r\u0131labilir, yeniden derlemeye gerek kalmadan esneklik sa\u011flan\u0131r.<\/p>\n
Java 5 ve sonraki s\u00fcr\u00fcmlerden itibaren, String[] args<\/code> yerine String... args<\/code> (varargs) da kullan\u0131labilir. Bu iki g\u00f6sterim semantik olarak ayn\u0131d\u0131r ve derleyici taraf\u0131ndan String[] args<\/code> olarak ele al\u0131n\u0131r. Varargs, metoda de\u011fi\u015fken say\u0131da arg\u00fcman ge\u00e7irilmesine olanak tan\u0131r ve bu durumda arg\u00fcmanlar otomatik olarak bir diziye d\u00f6n\u00fc\u015ft\u00fcr\u00fcl\u00fcr. Ancak main<\/code> metodu i\u00e7in genellikle String[] args<\/code> g\u00f6sterimi tercih edilir, zira bu, komut sat\u0131r\u0131 arg\u00fcmanlar\u0131n\u0131n bir dizi olarak gelece\u011fi beklentisini daha net ifade eder.<\/p>\n
JVM ve main Metodunun \u00c7al\u0131\u015fma Mekanizmas\u0131<\/h2>\n
Bir Java program\u0131n\u0131n derlenmesinden \u00e7al\u0131\u015ft\u0131r\u0131lmas\u0131na kadar olan s\u00fcre\u00e7 ve main<\/code> metodunun bu s\u00fcre\u00e7teki rol\u00fc, Java'n\u0131n temel i\u015fleyi\u015fini anlamak i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n
1.  Derleme A\u015famas\u0131:<\/strong> Java kaynak kodu (.java<\/code> uzant\u0131l\u0131 dosyalar), javac<\/code> derleyicisi taraf\u0131ndan derlenir. Bu i\u015flem sonucunda, Java bytecode'u i\u00e7eren .class<\/code> uzant\u0131l\u0131 dosyalar olu\u015fur. Bu bytecode, platformdan ba\u011f\u0131ms\u0131zd\u0131r ve herhangi bir JVM \u00fczerinde \u00e7al\u0131\u015ft\u0131r\u0131labilir.<\/p>\n
2.  \u00c7al\u0131\u015ft\u0131rma A\u015famas\u0131:<\/strong> Program\u0131 \u00e7al\u0131\u015ft\u0131rmak i\u00e7in java S\u0131n\u0131fAd\u0131<\/code> komutu kullan\u0131l\u0131r (\u00f6rne\u011fin java MyProgram<\/code>). Bu komut, Java Sanal Makinesi'ni (JVM) ba\u015flat\u0131r.<\/p>\n
3.  JVM'in Ba\u015flamas\u0131 ve S\u0131n\u0131f Y\u00fckleme:<\/strong> JVM ba\u015flad\u0131\u011f\u0131nda, \u00f6ncelikle S\u0131n\u0131fAd\u0131<\/code> ile belirtilen s\u0131n\u0131f\u0131 bulur ve belle\u011fe y\u00fckler. Bu i\u015flemden Class Loader (S\u0131n\u0131f Y\u00fckleyici) sorumludur. Class Loader, s\u0131n\u0131f\u0131n bytecode'unu okur, do\u011frular ve bellekte uygun bir alana yerle\u015ftirir.<\/p>\n
4.  main<\/code> Metodunun Bulunmas\u0131:<\/strong> S\u0131n\u0131f belle\u011fe y\u00fcklendikten sonra, JVM bu s\u0131n\u0131f i\u00e7erisinde public static void main(String[] args)<\/code> imzas\u0131na sahip metodu aramaya ba\u015flar. Bu metot, JVM i\u00e7in program\u0131n ba\u015flang\u0131\u00e7 noktas\u0131d\u0131r.<\/p>\n
5.  main<\/code> Metodunun Y\u00fcr\u00fct\u00fclmesi:<\/strong> JVM, main<\/code> metodunu buldu\u011funda, program\u0131n ana i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 (main thread) olu\u015fturur ve bu i\u015f par\u00e7ac\u0131\u011f\u0131 \u00fczerinde main<\/code> metodunu y\u00fcr\u00fctmeye ba\u015flar. Komut sat\u0131r\u0131ndan ge\u00e7irilen t\u00fcm arg\u00fcmanlar, String[] args<\/code> parametresi olarak bu metoda iletilir.<\/p>\n
6.  Program\u0131n Sonlanmas\u0131:<\/strong> main<\/code> metodunun y\u00fcr\u00fct\u00fclmesi tamamland\u0131\u011f\u0131nda (yani metodun sonuna ula\u015f\u0131ld\u0131\u011f\u0131nda veya System.exit()<\/code> \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda), JVM program\u0131n ana i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 sonland\u0131r\u0131r. E\u011fer ba\u015fka kullan\u0131c\u0131 i\u015f par\u00e7ac\u0131klar\u0131 (daemon olmayan i\u015f par\u00e7ac\u0131klar\u0131) \u00e7al\u0131\u015fm\u0131yorsa, JVM de kapan\u0131r ve program sonlan\u0131r.<\/p>\n
Bu s\u00fcre\u00e7, Java'n\u0131n \"bir kez yaz, her yerde \u00e7al\u0131\u015ft\u0131r\" (Write Once, Run Anywhere - WORA) felsefesinin temelini olu\u015fturur. JVM, i\u015fletim sistemi ile Java uygulamas\u0131 aras\u0131nda bir soyutlama katman\u0131 g\u00f6revi g\u00f6r\u00fcr ve main<\/code> metodu bu soyutlaman\u0131n giri\u015f kap\u0131s\u0131d\u0131r.<\/p>\n
main Metodunun \u00d6nemi ve Kullan\u0131m Alanlar\u0131<\/h2>\n
main<\/code> metodu, Java ekosisteminde merkezi bir rol oynar ve bir\u00e7ok farkl\u0131 uygulama t\u00fcr\u00fcn\u00fcn ba\u015flang\u0131\u00e7 noktas\u0131d\u0131r:<\/p>\n
*   Konsol Uygulamalar\u0131:<\/strong> En temel Java uygulamalar\u0131 olan konsol uygulamalar\u0131, genellikle kullan\u0131c\u0131 etkile\u015fimi i\u00e7in komut sat\u0131r\u0131n\u0131 kullanan ve \u00e7\u0131kt\u0131lar\u0131 konsola yazd\u0131ran programlard\u0131r. Bu t\u00fcr uygulamalar\u0131n tamam\u0131 main<\/code> metodundan ba\u015flar.
\n*   GUI Uygulamalar\u0131:<\/strong> JavaFX, Swing veya AWT gibi k\u00fct\u00fcphanelerle geli\u015ftirilen grafiksel kullan\u0131c\u0131 aray\u00fcz\u00fc (GUI) uygulamalar\u0131 da main<\/code> metodundan ba\u015flar. main<\/code> metodu genellikle GUI penceresini olu\u015fturur ve Event Dispatch Thread (EDT) gibi GUI olay d\u00f6ng\u00fcs\u00fcn\u00fc ba\u015flatan kodlar\u0131 i\u00e7erir.
\n*   Web Uygulamalar\u0131 (Framework'ler Arac\u0131l\u0131\u011f\u0131yla):<\/strong> Do\u011frudan main<\/code> metodundan ba\u015flamasalar da, Tomcat veya Jetty gibi uygulama sunucular\u0131, web uygulamalar\u0131n\u0131 \u00e7al\u0131\u015ft\u0131rmak i\u00e7in kendi i\u00e7lerinde Java kodunu \u00e7a\u011f\u0131r\u0131r. Spring Boot gibi modern web \u00e7er\u00e7eveleri ise kendi main<\/code> metodlar\u0131n\u0131 kullanarak g\u00f6m\u00fcl\u00fc sunucular\u0131 ba\u015flat\u0131r ve uygulamay\u0131 \u00e7al\u0131\u015ft\u0131r\u0131r.
\n*   Test Senaryolar\u0131:<\/strong> Geli\u015ftiriciler, k\u00fc\u00e7\u00fck kod par\u00e7ac\u0131klar\u0131n\u0131 veya algoritmalar\u0131 h\u0131zl\u0131ca test etmek i\u00e7in ge\u00e7ici main<\/code> metodlar\u0131 olu\u015fturabilirler. Bu, \u00f6zellikle birim test \u00e7er\u00e7eveleri kullanmadan \u00f6nce h\u0131zl\u0131 prototipleme yapmak i\u00e7in faydal\u0131d\u0131r.
\n*   Komut Sat\u0131r\u0131 Ara\u00e7lar\u0131:<\/strong> Bir\u00e7ok sistem arac\u0131 ve yard\u0131mc\u0131 program, Java ile yaz\u0131l\u0131r ve komut sat\u0131r\u0131 arg\u00fcmanlar\u0131n\u0131 i\u015flemek i\u00e7in main<\/code> metodunu kullan\u0131r. Bu ara\u00e7lar, otomasyon betikleri veya sistem y\u00f6netimi g\u00f6revleri i\u00e7in idealdir.
\n*   Bootstrapping:<\/strong> Uygulaman\u0131n ba\u015flang\u0131\u00e7 konfig\u00fcrasyonunu y\u00fcklemek, veritaban\u0131 ba\u011flant\u0131lar\u0131n\u0131 kurmak, loglama sistemini ba\u015flatmak gibi ilk kurulum g\u00f6revleri genellikle main<\/code> metodu i\u00e7erisinde veya main<\/code> metodundan \u00e7a\u011fr\u0131lan metodlar arac\u0131l\u0131\u011f\u0131yla ger\u00e7ekle\u015ftirilir.<\/p>\n
S\u0131k\u00e7a Sorulan Sorular ve Yanl\u0131\u015f Anlamalar<\/h2>\n
main<\/code> metodu hakk\u0131nda s\u0131k\u00e7a sorulan baz\u0131 sorular ve yayg\u0131n yanl\u0131\u015f anlamalar mevcuttur:<\/p>\n
*   main<\/code> metodu olmadan Java program\u0131 \u00e7al\u0131\u015f\u0131r m\u0131?<\/strong>
\n    Hay\u0131r, do\u011frudan \u00e7al\u0131\u015fmaz. JVM, program\u0131 ba\u015flatmak i\u00e7in public static void main(String[] args)<\/code> imzas\u0131na sahip bir metot arar. E\u011fer bu metot bulunamazsa, JVM bir hata verir ve program\u0131 ba\u015flatmaz. Ancak, baz\u0131 Java teknolojileri (\u00f6rne\u011fin eski Java Applet'leri veya baz\u0131 kurumsal uygulamalar) kendi ya\u015fam d\u00f6ng\u00fclerini y\u00f6neten ve main<\/code> metoduna ihtiya\u00e7 duymayan farkl\u0131 giri\u015f noktalar\u0131 kullanabilir. Modern web \u00e7er\u00e7eveleri (Spring Boot gibi) de genellikle kendi main<\/code> metodlar\u0131n\u0131 kullanarak uygulamay\u0131 bir sunucu i\u00e7inde ba\u015flat\u0131r.<\/p>\n
*   main<\/code> metodunun eri\u015fim belirleyicisini de\u011fi\u015ftirebilir miyiz?<\/strong>
\n    Hay\u0131r, public<\/code> olmak zorundad\u0131r. JVM'in bu metoda d\u0131\u015far\u0131dan eri\u015febilmesi i\u00e7in public<\/code> olmas\u0131 gereklidir. Aksi takdirde, main<\/code> metodu bulunamaz hatas\u0131 al\u0131rs\u0131n\u0131z.<\/p>\n
*   main<\/code> metodunun static<\/code> olmamas\u0131 durumunda ne olur?<\/strong>
\n    JVM, static<\/code> olmayan bir main<\/code> metodunu ba\u015flang\u0131\u00e7 noktas\u0131 olarak tan\u0131maz. Program ba\u015flat\u0131l\u0131rken main<\/code> metodunun static<\/code> olmad\u0131\u011f\u0131na dair bir hata (NoSuchMethodError: main<\/code>) al\u0131rs\u0131n\u0131z. Bunun nedeni, JVM'in hen\u00fcz s\u0131n\u0131f\u0131n bir nesnesini olu\u015fturmadan main<\/code> metodunu do\u011frudan s\u0131n\u0131f \u00fczerinden \u00e7a\u011f\u0131rmas\u0131 gerekti\u011fidir.<\/p>\n
*   main<\/code> metodunun d\u00f6n\u00fc\u015f tipi void<\/code> d\u0131\u015f\u0131nda olabilir mi?<\/strong>
\n    Hay\u0131r, void<\/code> olmak zorundad\u0131r. JVM, main<\/code> metodunun bir de\u011fer d\u00f6nd\u00fcrmesini beklemez. Program\u0131n \u00e7\u0131k\u0131\u015f durumu System.exit()<\/code> metodu arac\u0131l\u0131\u011f\u0131yla kontrol edilir.<\/p>\n
*   Bir s\u0131n\u0131fta birden fazla main<\/code> metodu olabilir mi?<\/strong>
\n    Evet, Java'da metot a\u015f\u0131r\u0131 y\u00fckleme (overloading) kurallar\u0131 gere\u011fi, farkl\u0131 parametre listelerine sahip birden fazla main<\/code> metodu tan\u0131mlanabilir. Ancak, JVM program\u0131 ba\u015flat\u0131rken yaln\u0131zca public static void main(String[] args)<\/code> imzas\u0131na sahip metodu giri\u015f noktas\u0131 olarak kullan\u0131r. Di\u011fer main<\/code> metodlar\u0131, normal metotlar gibi program\u0131n ba\u015fka yerlerinden \u00e7a\u011fr\u0131labilir.<\/p>\n
*   String[] args<\/code> parametresinin ad\u0131 args<\/code> olmak zorunda m\u0131?<\/strong>
\n    Hay\u0131r, args<\/code> sadece bir de\u011fi\u015fken ad\u0131d\u0131r. String[] parameters<\/code> veya String[] arguments<\/code> gibi ba\u015fka ge\u00e7erli isimler de kullan\u0131labilir. \u00d6nemli olan, parametrenin tipinin String<\/code> dizisi olmas\u0131d\u0131r. Ancak, args<\/code> ismi bir gelenek haline gelmi\u015ftir ve kodun okunabilirli\u011fi a\u00e7\u0131s\u0131ndan korunmas\u0131 tavsiye edilir.<\/p>\n
Geli\u015fmi\u015f Konular ve Alternatifler<\/h2>\n
main<\/code> metodunun temel i\u015flevini anlad\u0131ktan sonra, baz\u0131 geli\u015fmi\u015f senaryolarda veya farkl\u0131 Java teknolojilerinde nas\u0131l ele al\u0131nd\u0131\u011f\u0131na bakmak faydal\u0131 olacakt\u0131r:<\/p>\n
*   GUI Uygulamalar\u0131 ve Olay D\u00f6ng\u00fcs\u00fc:<\/strong> Swing veya JavaFX gibi GUI k\u00fct\u00fcphaneleriyle geli\u015ftirilen uygulamalarda main<\/code> metodu, genellikle GUI'nin ana penceresini olu\u015fturur ve EventQueue.invokeLater()<\/code> (Swing i\u00e7in) veya Application.launch()<\/code> (JavaFX i\u00e7in) gibi metodlar\u0131 \u00e7a\u011f\u0131rarak GUI olay d\u00f6ng\u00fcs\u00fcn\u00fc (Event Dispatch Thread - EDT) ba\u015flat\u0131r. main<\/code> metodu bu noktadan sonra kendi i\u015fini bitirir, ancak GUI uygulamas\u0131 EDT \u00fczerinde \u00e7al\u0131\u015fmaya devam eder ve kullan\u0131c\u0131 etkile\u015fimlerini bekler.
\n*   Spring Boot Uygulamalar\u0131:<\/strong> Spring Boot gibi modern Java \u00e7er\u00e7eveleri, geli\u015ftiricilerin h\u0131zl\u0131ca ba\u011f\u0131ms\u0131z (standalone) ve \u00fcretime haz\u0131r uygulamalar olu\u015fturmas\u0131na olanak tan\u0131r. Bir Spring Boot uygulamas\u0131nda da main<\/code> metodu bulunur, genellikle \u015f\u00f6yle g\u00f6r\u00fcn\u00fcr:<\/p>\n
@SpringBootApplication\n    public class MyApplication {\n        public static void main(String[] args) {\n            SpringApplication.run(MyApplication.class, args);\n        }\n    }<\/code><\/pre>\n
    Burada main<\/code> metodu, SpringApplication'\u0131 ba\u015flatarak uygulaman\u0131n t\u00fcm konfig\u00fcrasyonunu, bile\u015fen taramas\u0131n\u0131 ve g\u00f6m\u00fcl\u00fc web sunucusunu (varsa) otomatik olarak aya\u011fa kald\u0131r\u0131r. Geli\u015ftiricinin main<\/code> metodunun i\u00e7inde karma\u015f\u0131k ba\u015flatma kodlar\u0131 yazmas\u0131na gerek kalmaz, \u00e7er\u00e7eve bu sorumlulu\u011fu \u00fcstlenir.
\n*   JUnit Testleri:<\/strong> Birim testleri yazarken, her bir test metodu kendi ba\u015f\u0131na \u00e7al\u0131\u015ft\u0131r\u0131labilir ve bir main<\/code> metoduna ihtiya\u00e7 duymaz. JUnit gibi test \u00e7er\u00e7eveleri, test s\u0131n\u0131flar\u0131n\u0131 ve metotlar\u0131n\u0131 yans\u0131ma (reflection) API'leri arac\u0131l\u0131\u011f\u0131yla bulur ve \u00e7al\u0131\u015ft\u0131r\u0131r. Dolay\u0131s\u0131yla, bir test s\u0131n\u0131f\u0131nda genellikle main<\/code> metodu bulunmaz.
\n*   Java Applet'leri (Eski Teknoloji):<\/strong> Java Applet'leri, web taray\u0131c\u0131lar\u0131nda \u00e7al\u0131\u015fan k\u00fc\u00e7\u00fck Java uygulamalar\u0131yd\u0131. Applet'lerin kendi main<\/code> metodlar\u0131 yoktu; bunun yerine, taray\u0131c\u0131 taraf\u0131ndan \u00e7a\u011fr\u0131lan init()<\/code>, start()<\/code>, paint()<\/code>, stop()<\/code>, destroy()<\/code> gibi ya\u015fam d\u00f6ng\u00fcs\u00fc metodlar\u0131na sahiplerdi. Bu teknoloji g\u00fcn\u00fcm\u00fczde b\u00fcy\u00fck \u00f6l\u00e7\u00fcde terk edilmi\u015ftir.
\n*   Java Servisleri:<\/strong> Windows servisleri veya Linux daemon'lar\u0131 olarak \u00e7al\u0131\u015fan Java uygulamalar\u0131, genellikle \u00f6zel ba\u015flatma mekanizmalar\u0131 kullan\u0131r. Bu mekanizmalar, main<\/code> metodunu \u00e7a\u011f\u0131rabilir veya do\u011frudan bir servis y\u00f6neticisi taraf\u0131ndan kontrol edilen ya\u015fam d\u00f6ng\u00fcs\u00fc metodlar\u0131na sahip olabilir. Genellikle, servis ba\u015flatma betikleri veya ara\u00e7lar\u0131, main<\/code> metodunu \u00e7a\u011f\u0131rarak Java uygulamas\u0131n\u0131 bir servis olarak kaydeder ve y\u00f6netir.<\/p>\n
Bu \u00f6rnekler, main<\/code> metodunun Java ekosistemindeki \u00e7e\u015fitlili\u011fini ve esnekli\u011fini g\u00f6stermektedir. Temel prensip ayn\u0131 kalsa da, farkl\u0131 uygulama t\u00fcrleri ve \u00e7er\u00e7eveler, main<\/code> metodunu kendi ihtiya\u00e7lar\u0131na g\u00f6re farkl\u0131 \u015fekillerde kullan\u0131r veya onun rol\u00fcn\u00fc soyutlar.<\/p>\n
Sonu\u00e7<\/h2>\n
public static void main(String[] args)<\/code> metodu, Java programlaman\u0131n temel ta\u015f\u0131 ve her Java uygulamas\u0131n\u0131n ba\u015flang\u0131\u00e7 noktas\u0131d\u0131r. Bu yap\u0131n\u0131n her bir anahtar kelimesi (public<\/code>, static<\/code>, void<\/code>) ve parametresi (String[] args<\/code>), Java'n\u0131n mimarisi ve \u00e7al\u0131\u015fma prensipleri hakk\u0131nda derinlemesine bilgi sa\u011flar. public<\/code> eri\u015fim belirleyicisi, JVM'in metoda d\u0131\u015far\u0131dan eri\u015fimini sa\u011flarken; static<\/code> anahtar kelimesi, s\u0131n\u0131f\u0131n bir \u00f6rne\u011fi olu\u015fturulmadan metodun do\u011frudan \u00e7a\u011fr\u0131labilmesini garanti eder. void<\/code> d\u00f6n\u00fc\u015f tipi, metodun bir de\u011fer d\u00f6nd\u00fcrmesine gerek olmad\u0131\u011f\u0131n\u0131 belirtirken, main<\/code> ad\u0131 JVM taraf\u0131ndan tan\u0131nan \u00f6zel bir giri\u015f noktas\u0131d\u0131r. Son olarak, String[] args<\/code> parametresi, komut sat\u0131r\u0131ndan programa dinamik arg\u00fcmanlar ge\u00e7irilmesine olanak tan\u0131r.<\/p>\n
Bu bile\u015fenlerin her birini anlamak, sadece bir Java program\u0131n\u0131 \u00e7al\u0131\u015ft\u0131rmak i\u00e7in gerekli olan bir kal\u0131b\u0131 ezberlemekten \u00e7ok daha fazlas\u0131d\u0131r. Bu, Java Sanal Makinesi'nin nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131, Java'n\u0131n nesne y\u00f6nelimli do\u011fas\u0131n\u0131 ve uygulamalar\u0131n nas\u0131l ba\u015flat\u0131l\u0131p y\u00f6netildi\u011fini kavraman\u0131n anahtar\u0131d\u0131r. Java yolculu\u011funa \u00e7\u0131kan her geli\u015ftiricinin, bu temel yap\u0131y\u0131 sa\u011flam bir \u015fekilde anlamas\u0131, daha karma\u015f\u0131k konulara ge\u00e7i\u015fte g\u00fc\u00e7l\u00fc bir temel olu\u015fturacakt\u0131r. main<\/code> metodu, basit bir konsol uygulamas\u0131ndan geli\u015fmi\u015f kurumsal \u00e7\u00f6z\u00fcmlere kadar t\u00fcm Java uygulamalar\u0131n\u0131n kalbinde yer alan, vazge\u00e7ilmez bir yap\u0131d\u0131r.<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Java’da public static void main(String[] args) Yap\u0131s\u0131n\u0131 Anlamak\nGiri\u015f\nJava programlama d\u00fcnyas\u0131na ad\u0131m atan herkesin ilk kar\u015f\u0131la\u015ft\u0131\u011f\u0131 ve","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1408],"tags":[],"class_list":{"0":"post-37869","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-java","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\nJava'da public static void main(String[] args) Yap\u0131s\u0131n\u0131 Anlamak - 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