{"id":30139,"date":"2025-09-24T05:40:28","date_gmt":"2025-09-24T02:40:28","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/"},"modified":"2025-09-24T05:40:28","modified_gmt":"2025-09-24T02:40:28","slug":"javada-es-zamanli-hashmap","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/","title":{"rendered":"Java’da E\u015f Zamanl\u0131 HashMap"},"content":{"rendered":"

# Java’da ConcurrentHashMap: Paralel Programlama \u0130\u00e7in G\u00fc\u00e7l\u00fc Bir Ara\u00e7<\/p>\n

Java ile e\u015f zamanl\u0131 (concurrent) programlama yaparken, verilerin g\u00fcvenli ve verimli bir \u015fekilde payla\u015f\u0131lmas\u0131 b\u00fcy\u00fck \u00f6nem ta\u015f\u0131r. Bu noktada, ConcurrentHashMap<\/code>, HashMap’in e\u015f zamanl\u0131l\u0131\u011fa uygun hali olarak, performans ve g\u00fcvenilirlik sunarak \u00f6ne \u00e7\u0131k\u0131yor. Bu makalede, Java’daki ConcurrentHashMap<\/code>‘in temellerinden ileri d\u00fczey kullan\u0131m\u0131na kadar detayl\u0131 bir yolculu\u011fa \u00e7\u0131kaca\u011f\u0131z. E\u015f zamanl\u0131 veri yap\u0131lar\u0131n\u0131n karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 anlamak ve performans optimizasyonlar\u0131n\u0131 uygulamak i\u00e7in ad\u0131m ad\u0131m bir rehber sunaca\u011f\u0131z.<\/p>\n

ConcurrentHashMap Nedir ve Neden Kullanmal\u0131y\u0131z?<\/strong><\/p>\n

Birden fazla thread’in ayn\u0131 veri yap\u0131s\u0131na ayn\u0131 anda eri\u015fmesi durumunda, veri tutars\u0131zl\u0131klar\u0131 ve yar\u0131\u015f ko\u015fullar\u0131 (race conditions) gibi sorunlarla kar\u015f\u0131la\u015fabiliriz. HashMap<\/code>, thread-safe olmad\u0131\u011f\u0131 i\u00e7in bu t\u00fcr durumlarda kullan\u0131lmamal\u0131d\u0131r. ConcurrentHashMap<\/code> ise, birden fazla thread’in ayn\u0131 anda veriye eri\u015fmesine ve g\u00fcncellemesine izin verirken veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc koruyarak bu sorunu \u00e7\u00f6zer. Bu, \u00f6zellikle \u00e7ok \u00e7ekirdekli i\u015flemcilerde performans art\u0131\u015f\u0131 sa\u011flar. Peki nas\u0131l yapar? ConcurrentHashMap<\/code>, i\u00e7 yap\u0131s\u0131nda kilit mekanizmalar\u0131n\u0131 (locking) verimli bir \u015fekilde kullanarak, t\u00fcm veri yap\u0131s\u0131na tek bir kilit koymak yerine, veriyi daha k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6lerek (segmentasyon) ve her par\u00e7aya ayr\u0131 bir kilit atayarak e\u015f zamanl\u0131 eri\u015fimi y\u00f6netir. Bu sayede, bir thread bir par\u00e7ay\u0131 g\u00fcncellerken di\u011fer thread’ler farkl\u0131 par\u00e7alara eri\u015fmeye devam edebilir, bu da performans\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r. HashMap<\/code>‘in aksine, ConcurrentHashMap<\/code> veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc garanti eder ve yar\u0131\u015f ko\u015fullar\u0131n\u0131 \u00f6nler.<\/p>\n

ConcurrentHashMap’i Nas\u0131l Kullan\u0131r\u0131z? (Yeni Ba\u015flayanlar \u0130\u00e7in)<\/strong><\/p>\n

ConcurrentHashMap<\/code> kullan\u0131m\u0131, HashMap<\/code>‘e olduk\u00e7a benzerdir. Anahtar-de\u011fer \u00e7iftleri eklemek, almak ve kald\u0131rmak i\u00e7in ayn\u0131 y\u00f6ntemleri kullanabilirsiniz. \u0130\u015fte basit bir \u00f6rnek:<\/p>\n

import java.util.concurrent.ConcurrentHashMap;\n\npublic class ConcurrentHashMapExample {\n    public static void main(String[] args) {\n        ConcurrentHashMap<String, Integer> hashMap = new ConcurrentHashMap<>();\n        hashMap.put("elma", 10);\n        hashMap.put("armut", 5);\n        System.out.println(hashMap.get("elma")); \/\/ \u00c7\u0131kt\u0131: 10\n        hashMap.remove("armut");\n        System.out.println(hashMap.size()); \/\/ \u00c7\u0131kt\u0131: 1\n    }\n}<\/code><\/pre>\n
Bu \u00f6rnekte, bir ConcurrentHashMap<\/code> olu\u015fturup, anahtar-de\u011fer \u00e7iftleri ekliyor, bir de\u011feri al\u0131yor ve bir \u00f6\u011feyi siliyoruz.  put()<\/code>, get()<\/code>, remove()<\/code> gibi temel metotlar thread-safe’tir.  Yani birden fazla thread bu metotlar\u0131 ayn\u0131 anda \u00e7a\u011f\u0131rsa bile veri tutarl\u0131l\u0131\u011f\u0131 korunur.<\/p>\n
Ger\u00e7ek D\u00fcnya Senaryolar\u0131 ve Optimizasyon \u0130pu\u00e7lar\u0131 (Orta Seviye)<\/strong><\/p>\n
ConcurrentHashMap<\/code>, \u00e7ok kullan\u0131c\u0131l\u0131 \u00e7evrimi\u00e7i oyunlar, b\u00fcy\u00fck veri i\u015fleme sistemleri ve y\u00fcksek e\u015f zamanl\u0131l\u0131k gerektiren uygulamalarda s\u0131k\u00e7a kullan\u0131l\u0131r.  \u00d6rne\u011fin, bir \u00e7evrimi\u00e7i oyun sunucusunda, her oyuncunun durumunu (puan, konum, envanter vb.) saklamak i\u00e7in ConcurrentHashMap<\/code> kullanabiliriz.  Her oyuncu, kendi durumunu g\u00fcncellemek i\u00e7in ayr\u0131 bir thread kullanabilir ve ConcurrentHashMap<\/code>, veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc koruyarak g\u00fcvenli bir \u015fekilde bu g\u00fcncellemeleri i\u015fleyebilir.<\/p>\n
Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong><\/p>\n
* \u0130deal Kapasite:<\/strong> ConcurrentHashMap<\/code>‘i ba\u015flat\u0131rken, beklenen eleman say\u0131s\u0131n\u0131 dikkate alarak uygun bir ba\u015flang\u0131\u00e7 kapasitesi belirlemek, performans\u0131 art\u0131rabilir. Gereksiz yeniden boyutland\u0131rmalar\u0131 \u00f6nler.
\n* Y\u00fck Fakt\u00f6r\u00fc:<\/strong> Y\u00fck fakt\u00f6r\u00fc, yeniden boyutland\u0131rman\u0131n ne zaman tetiklenece\u011fini belirler.  Varsay\u0131lan de\u011fer 0.75’tir.  Daha y\u00fcksek bir y\u00fck fakt\u00f6r\u00fc, daha fazla bellek kullan\u0131m\u0131 anlam\u0131na gelir ancak yeniden boyutland\u0131rma i\u015flemlerini azalt\u0131r.
\n* Segment Say\u0131s\u0131 (Eski s\u00fcr\u00fcmler):<\/strong>  Java 8’den \u00f6nceki s\u00fcr\u00fcmlerde, segment say\u0131s\u0131 performans\u0131 etkilerdi.  Ancak Java 8 ve sonras\u0131nda bu segmentasyon mekanizmas\u0131 de\u011fi\u015ftirilmi\u015ftir ve bu parametreyi manuel olarak ayarlamak genellikle gereksizdir.<\/p>\n
Performans Analizi ve Edge Case’ler (\u0130leri Seviye)<\/strong><\/p>\n
ConcurrentHashMap<\/code>‘in performans\u0131, kullan\u0131lan Java s\u00fcr\u00fcm\u00fcne, i\u015flemci \u00e7ekirdek say\u0131s\u0131na ve veri setinin b\u00fcy\u00fckl\u00fc\u011f\u00fcne ba\u011fl\u0131d\u0131r.  Java 8’den sonra yap\u0131lan iyile\u015ftirmeler, performans\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rm\u0131\u015ft\u0131r.  Segmentasyon yerine daha verimli bir e\u015f zamanl\u0131l\u0131k kontrol mekanizmas\u0131 kullan\u0131lmaktad\u0131r.<\/p>\n
Edge Case’ler:<\/strong><\/p>\n
* Sonsuz D\u00f6ng\u00fcler:<\/strong>  ConcurrentHashMap<\/code>‘i kullan\u0131rken, sonsuz d\u00f6ng\u00fclere dikkat etmek \u00f6nemlidir.  Yanl\u0131\u015f kilit mekanizmalar\u0131 veya hatal\u0131 senkronizasyon, performans sorunlar\u0131na ve hatta uygulama \u00e7\u00f6kmelerine neden olabilir.
\n* Bellek Y\u00f6netimi:<\/strong>  \u00c7ok b\u00fcy\u00fck veri setleri i\u00e7in, ConcurrentHashMap<\/code>‘in bellek kullan\u0131m\u0131 dikkatlice izlenmelidir.  Gereksiz bellek t\u00fcketimini \u00f6nlemek i\u00e7in, kullan\u0131lmayan \u00f6\u011feleri d\u00fczenli olarak temizlemek \u00f6nemli olabilir.
\n* \u00d6ng\u00f6r\u00fclemeyen Davran\u0131\u015flar:<\/strong> \u00c7ok karma\u015f\u0131k e\u015f zamanl\u0131 i\u015flemler yaparken, beklenmedik davran\u0131\u015flarla kar\u015f\u0131la\u015fabilirsiniz.  Bu t\u00fcr durumlar\u0131 \u00f6nlemek i\u00e7in, kodun iyice test edilmesi ve performans\u0131n\u0131n izlenmesi gerekir.<\/p>\n
ConcurrentHashMap’in HashMap’ten Farklar\u0131<\/strong><\/p>\n
| \u00d6zellik          | HashMap                     | ConcurrentHashMap             |
\n|—————–|——————————|——————————-|
\n| Thread Safety   | Hay\u0131r                         | Evet                           |
\n| Performans       | Tek thread’lerde daha h\u0131zl\u0131     | \u00c7ok thread’lerde daha h\u0131zl\u0131    |
\n| Bellek Kullan\u0131m\u0131 | Genellikle daha az           | Genellikle daha fazla          |
\n| Senkronizasyon  | D\u0131\u015far\u0131dan senkronizasyon gerektiriyor | Dahili senkronizasyon mekanizmas\u0131 |<\/p>\n
\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n
Yeni Ba\u015flayan:<\/strong> Yukar\u0131da verilen basit \u00f6rnekleri \u00e7al\u0131\u015ft\u0131r\u0131n ve put()<\/code>, get()<\/code>, remove()<\/code> gibi temel metotlar\u0131 deneyimleyin.  ConcurrentHashMap<\/code>‘in nas\u0131l olu\u015fturuldu\u011funu ve temel i\u015flemlerinin nas\u0131l yap\u0131ld\u0131\u011f\u0131n\u0131 anlay\u0131n.<\/p>\n
Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 inceleyin.  Bir web uygulamas\u0131nda kullan\u0131c\u0131 oturumlar\u0131n\u0131 y\u00f6netmek veya bir oyun sunucusunda oyuncu verilerini saklamak gibi \u00f6rnekler \u00fczerinde \u00e7al\u0131\u015f\u0131n.  Optimizasyon ipu\u00e7lar\u0131n\u0131 uygulay\u0131n ve performans de\u011fi\u015fikliklerini g\u00f6zlemleyin.<\/p>\n
\u0130leri Seviye:<\/strong>  Performans testleri yap\u0131n.  Farkl\u0131 veri setleri ve thread say\u0131lar\u0131yla performans\u0131 \u00f6l\u00e7\u00fcn.  Edge case’leri inceleyin ve olas\u0131 sorunlar\u0131 \u00f6nlemek i\u00e7in stratejiler geli\u015ftirin.  ConcurrentHashMap<\/code>‘in i\u00e7 yap\u0131s\u0131n\u0131 daha derinlemesine ara\u015ft\u0131r\u0131n ve farkl\u0131 Java s\u00fcr\u00fcmlerindeki de\u011fi\u015fiklikleri anlay\u0131n.  Daha geli\u015fmi\u015f e\u015f zamanl\u0131l\u0131k konseptlerini (\u00f6rne\u011fin, CompletionService<\/code>, ExecutorService<\/code>)  ConcurrentHashMap<\/code> ile entegre etmeyi deneyin.<\/p>\n
Sonu\u00e7<\/strong><\/p>\n
ConcurrentHashMap<\/code>, Java’da e\u015f zamanl\u0131 programlama i\u00e7in g\u00fc\u00e7l\u00fc ve verimli bir ara\u00e7t\u0131r.  Bu makalede, ConcurrentHashMap<\/code>‘in temel \u00f6zelliklerinden ileri d\u00fczey kullan\u0131m\u0131na kadar detayl\u0131 bir bak\u0131\u015f sunduk.  Uygun \u015fekilde kullan\u0131ld\u0131\u011f\u0131nda, performans\u0131 art\u0131r\u0131r ve veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc korur.  Ancak, karma\u015f\u0131k senaryolarda, olas\u0131 sorunlar\u0131 \u00f6nlemek i\u00e7in dikkatli bir \u015fekilde kullan\u0131lmal\u0131 ve performans\u0131 izlenmelidir.  Daha fazla bilgi i\u00e7in [Fatih Soysal’\u0131n bloguna](https:\/\/fatihsoysal.com) g\u00f6z atabilirsiniz.<\/p>\n
S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n
1. ConcurrentHashMap<\/code> ile Hashtable<\/code> aras\u0131ndaki fark nedir?<\/strong>  Hashtable<\/code> da thread-safe’tir ancak ConcurrentHashMap<\/code>‘den daha az verimlidir \u00e7\u00fcnk\u00fc t\u00fcm veri yap\u0131s\u0131na tek bir kilit koyar.<\/p>\n
2. ConcurrentHashMap<\/code>‘in bellek kullan\u0131m\u0131 nas\u0131l optimize edilebilir?<\/strong>  Kullan\u0131lmayan \u00f6\u011feleri temizlemek, uygun ba\u015flang\u0131\u00e7 kapasitesini belirlemek ve y\u00fck fakt\u00f6r\u00fcn\u00fc ayarlamak bellek kullan\u0131m\u0131n\u0131 optimize edebilir.<\/p>\n
3. ConcurrentHashMap<\/code>‘i ne zaman kullanmal\u0131y\u0131m?<\/strong> Birden fazla thread’in ayn\u0131 veri yap\u0131s\u0131na e\u015f zamanl\u0131 eri\u015fmesi ve g\u00fcncellemesi gerekti\u011finde ConcurrentHashMap<\/code> kullan\u0131lmal\u0131d\u0131r.<\/p>\n
4. ConcurrentHashMap<\/code>‘in performans\u0131n\u0131 nas\u0131l \u00f6l\u00e7ebilirim?<\/strong>  JMH (Java Microbenchmark Harness) gibi performans test ara\u00e7lar\u0131 kullan\u0131labilir.<\/p>\n
5. Java 8’deki ConcurrentHashMap<\/code> iyile\u015ftirmeleri nelerdir?<\/strong>  Java 8, segmentasyon yerine daha verimli bir e\u015f zamanl\u0131l\u0131k kontrol mekanizmas\u0131 getirmi\u015ftir, performans\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rm\u0131\u015ft\u0131r.<\/p>\n
Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# Java’da ConcurrentHashMap: Paralel Programlama \u0130\u00e7in G\u00fc\u00e7l\u00fc Bir Ara\u00e7 Java ile e\u015f zamanl\u0131 (concurrent) programlama yaparken, verilerin g\u00fcvenli…","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-30139","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 E\u015f Zamanl\u0131 HashMap<\/title>\n<meta name=\"description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java'da E\u015f Zamanl\u0131 HashMap\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-09-24T02:40:28+00:00\" \/>\n<meta name=\"author\" content=\"Fatih Soysal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fatih Soysal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"Java’da E\u015f Zamanl\u0131 HashMap\",\"datePublished\":\"2025-09-24T02:40:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/\"},\"wordCount\":1104,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"articleSection\":[\"Java\"],\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/\",\"name\":\"Java'da E\u015f Zamanl\u0131 HashMap\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-09-24T02:40:28+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javada-es-zamanli-hashmap\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Java’da E\u015f Zamanl\u0131 HashMap\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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