{"id":16665,"date":"2025-03-30T10:00:17","date_gmt":"2025-03-30T07:00:17","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/java-coklu-is-parcacigi-kavramlar-ornekler-ve-en-iyi-uygulamalar\/"},"modified":"2025-03-30T10:00:17","modified_gmt":"2025-03-30T07:00:17","slug":"java-coklu-is-parcacigi-kavramlar-ornekler-ve-en-iyi-uygulamalar","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/java-coklu-is-parcacigi-kavramlar-ornekler-ve-en-iyi-uygulamalar\/","title":{"rendered":"Java \u00c7oklu \u0130\u015f Par\u00e7ac\u0131\u011f\u0131: Kavramlar, \u00d6rnekler ve En \u0130yi Uygulamalar"},"content":{"rendered":"

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Java \u00c7oklu \u0130\u015f Par\u00e7ac\u0131\u011f\u0131: Kavramlar, \u00d6rnekler ve En \u0130yi Uygulamalar<\/p>\n

Merhaba! Bu makalede, Java’da \u00e7oklu i\u015f par\u00e7ac\u0131\u011f\u0131 (multithreading) kavram\u0131n\u0131, nas\u0131l kullan\u0131laca\u011f\u0131n\u0131 ve performans\u0131n\u0131z\u0131 art\u0131rmak i\u00e7in en iyi uygulamalar\u0131 ele alaca\u011f\u0131z. \u00d6ncelikle \u00e7oklu i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131n ne oldu\u011funu ve neden \u00f6nemli oldu\u011funu anlamakla ba\u015flayal\u0131m. Ard\u0131ndan, temel kavramlar\u0131 ve pratik \u00f6rneklerle desteklenen detayl\u0131 a\u00e7\u0131klamalar\u0131 inceleyece\u011fiz. Son olarak da, performans sorunlar\u0131ndan ka\u00e7\u0131nmak ve g\u00fcvenilir uygulamalar geli\u015ftirmek i\u00e7in en iyi uygulamalar\u0131 g\u00f6zden ge\u00e7irece\u011fiz.<\/p>\n

Java’da \u00c7oklu \u0130\u015f Par\u00e7ac\u0131\u011f\u0131 Nedir?<\/h2>\n

Java’da \u00e7oklu i\u015f par\u00e7ac\u0131\u011f\u0131, tek bir program i\u00e7inde birden fazla i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131n ayn\u0131 anda \u00e7al\u0131\u015fmas\u0131na olanak sa\u011flayan bir programlama tekni\u011fidir. Bu, program\u0131n farkl\u0131 g\u00f6revleri e\u015f zamanl\u0131 olarak ger\u00e7ekle\u015ftirmesine ve genel performans\u0131 art\u0131rmas\u0131na olanak tan\u0131r. \u00d6rne\u011fin, bir grafiksel kullan\u0131c\u0131 aray\u00fcz\u00fcnde (GUI) bir i\u015f par\u00e7ac\u0131\u011f\u0131 kullan\u0131c\u0131 etkile\u015fimlerini i\u015flerken, ba\u015fka bir i\u015f par\u00e7ac\u0131\u011f\u0131 arka planda veri i\u015flemleri yapabilir. Bu sayede kullan\u0131c\u0131 aray\u00fcz\u00fc donmadan veya yava\u015flamadan \u00e7al\u0131\u015fmaya devam eder.<\/p>\n

Temel Kavramlar<\/h2>\n

Thread Nedir?<\/h3>\n

Bir thread, bir program\u0131n ba\u011f\u0131ms\u0131z olarak \u00e7al\u0131\u015fabilen en k\u00fc\u00e7\u00fck y\u00fcr\u00fctme birimidir. Her thread’in kendi y\u00fcr\u00fctme y\u0131\u011f\u0131n\u0131 (stack) ve program sayac\u0131 vard\u0131r. Bir program birden fazla thread’i ayn\u0131 anda \u00e7al\u0131\u015ft\u0131rabilir. Ancak, tek \u00e7ekirdekli bir i\u015flemcide bu e\u015fzamanl\u0131l\u0131k ger\u00e7ekte ayn\u0131 anda olmayabilir. \u0130\u015fletim sistemi, thread’ler aras\u0131nda h\u0131zl\u0131ca ge\u00e7i\u015f yaparak e\u015f zamanl\u0131l\u0131k yan\u0131lsamas\u0131n\u0131 olu\u015fturur. \u00c7ok \u00e7ekirdekli i\u015flemciler ise ger\u00e7ekten ayn\u0131 anda birden fazla thread’i \u00e7al\u0131\u015ft\u0131rabilir. <\/p>\n

Thread Olu\u015fturma<\/h3>\n

Java’da bir thread olu\u015fturman\u0131n iki temel yolu vard\u0131r: Thread<\/code> s\u0131n\u0131f\u0131n\u0131 geni\u015fleterek veya Runnable<\/code> aray\u00fcz\u00fcn\u00fc uygulayarak. \u0130kinci y\u00f6ntem, daha \u00e7ok tercih edilir \u00e7\u00fcnk\u00fc bir s\u0131n\u0131f\u0131n sadece bir \u00fcst s\u0131n\u0131f\u0131 olabilir ancak birden \u00e7ok aray\u00fcz\u00fc uygulayabilir. A\u015fa\u011f\u0131da, her iki y\u00f6ntemi g\u00f6steren \u00f6rnekler bulunmaktad\u0131r:<\/p>\n

\n\/\/ Thread s\u0131n\u0131f\u0131n\u0131 geni\u015fletme\nclass MyThread extends Thread {\n    public void run() {\n        System.out.println(\"MyThread \u00e7al\u0131\u015f\u0131yor.\");\n    }\n}\n\n\/\/ Runnable aray\u00fcz\u00fcn\u00fc uygulama\nclass MyRunnable implements Runnable {\n    public void run() {\n        System.out.println(\"MyRunnable \u00e7al\u0131\u015f\u0131yor.\");\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) {\n        MyThread thread1 = new MyThread();\n        thread1.start();\n\n        Thread thread2 = new Thread(new MyRunnable());\n        thread2.start();\n    }\n}\n<\/code><\/pre>\n
Thread Senkronizasyonu<\/h3>\n
Birden fazla thread ayn\u0131 kaynaklar\u0131 (\u00f6rne\u011fin, bir de\u011fi\u015fken veya dosya) payla\u015ft\u0131\u011f\u0131nda, yar\u0131\u015f ko\u015fullar\u0131 (race conditions) olu\u015fabilir.  Bu durum, beklenmedik ve hatal\u0131 sonu\u00e7lara yol a\u00e7abilir.  Bu nedenle, thread senkronizasyonu \u00f6nemlidir.  Java, synchronized<\/code> anahtar s\u00f6zc\u00fc\u011f\u00fc, locks<\/code> ve semaphores<\/code> gibi mekanizmalar sunarak thread senkronizasyonunu sa\u011flar.<\/p>\n
\npublic class Counter {\n    private int count = 0;\n\n    public synchronized void increment() {\n        count++;\n    }\n\n    public int getCount() {\n        return count;\n    }\n}\n<\/code><\/pre>\n
En \u0130yi Uygulamalar<\/h2>\n
Verimli ve g\u00fcvenilir \u00e7oklu i\u015f par\u00e7ac\u0131kl\u0131 uygulamalar geli\u015ftirmek i\u00e7in a\u015fa\u011f\u0131daki en iyi uygulamalar\u0131 izlemek \u00f6nemlidir:<\/p>\n