{"id":10206,"date":"2026-10-30T20:42:05","date_gmt":"2026-10-30T17:42:05","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10206"},"modified":"2026-10-30T20:42:05","modified_gmt":"2026-10-30T17:42:05","slug":"java-da-hashmap-nedir","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/java-da-hashmap-nedir\/","title":{"rendered":"Java&#8217;da HashMap Nedir?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Java programlama dilinde verileri organize etmek, aramak ve i\u015flemek yaz\u0131l\u0131m geli\u015ftirme s\u00fcre\u00e7lerinin temel ta\u015flar\u0131ndan biridir. Standart diziler veya liste yap\u0131lar\u0131 (ArrayList gibi) elemanlar\u0131 say\u0131sal indeks numaralar\u0131 (0, 1, 2&#8230;) \u00fczerinden saklar. Ancak ger\u00e7ek d\u00fcnya senaryolar\u0131nda bir veriye eri\u015fmek i\u00e7in say\u0131sal indisler yerine kimlik numaras\u0131, kullan\u0131c\u0131 ad\u0131 veya \u00fcr\u00fcn kodu gibi anlaml\u0131 belirte\u00e7ler kullanmak gerekir. Bu noktada Java Collections Framework \u00e7at\u0131s\u0131 alt\u0131nda yer alan HashMap s\u0131n\u0131f\u0131 devreye girer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HashMap Nedir ve Hangi Ama\u00e7la Kullan\u0131l\u0131r?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap, <code>java.util<\/code> paketinde bulunan ve <code>Map<\/code> aray\u00fcz\u00fcn\u00fc (interface) uygulayan bir koleksiyon s\u0131n\u0131f\u0131d\u0131r. Verileri &#8220;Anahtar-De\u011fer&#8221; (Key-Value) \u00e7iftleri halinde depolar. Buradaki temel fikir, her bir de\u011fere (value) ula\u015fmak i\u00e7in benzersiz bir anahtar\u0131n (key) kullan\u0131lmas\u0131d\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap yap\u0131s\u0131n\u0131n \u00f6ne \u00e7\u0131kan temel \u00f6zellikleri \u015funlard\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Anahtarlar benzersiz (unique) olmak zorundad\u0131r. Ayn\u0131 anahtarla yeni bir de\u011fer eklenirse, eski de\u011ferin \u00fczerine yaz\u0131l\u0131r.<\/li>\n\n<li>De\u011ferler (values) yinelenen (duplicate) veriler i\u00e7erebilir; farkl\u0131 anahtarlar ayn\u0131 de\u011fere i\u015faret edebilir.<\/li>\n\n<li>Bir adet <code>null<\/code> anahtara ve birden fazla <code>null<\/code> de\u011fere izin verir.<\/li>\n\n<li>Elemanlar\u0131n belle\u011fe eklenme s\u0131ras\u0131n\u0131 garanti etmez; verilerin s\u0131ras\u0131 zaman i\u00e7inde i\u00e7 d\u00fczenlemeler nedeniyle de\u011fi\u015febilir.<\/li>\n\n<li>\u0130\u015f par\u00e7ac\u0131\u011f\u0131 g\u00fcvenli\u011fi (thread-safe) sa\u011flamaz. \u00c7ok i\u015f par\u00e7ac\u0131kl\u0131 (multi-threaded) ortamlarda senkronizasyon harici olarak y\u00f6netilmelidir.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">HashMap Arka Planda Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap&#8217;in veri arama, ekleme ve silme i\u015flemlerinde ortalama O(1) zaman karma\u015f\u0131kl\u0131\u011f\u0131 sunmas\u0131n\u0131n arkas\u0131nda &#8220;Hashing&#8221; (\u00f6zetleme) algoritmas\u0131 yatar. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap bellekte &#8220;Bucket&#8221; (kova) ad\u0131 verilen bir dizi \u00fczerinde \u00e7al\u0131\u015f\u0131r. Bir anahtar-de\u011fer \u00e7ifti eklendi\u011finde \u015fu ad\u0131mlar ger\u00e7ekle\u015fir:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Eklenmek istenen anahtar nesnesinin <code>hashCode()<\/code> metodu \u00e7a\u011fr\u0131l\u0131r. Bu metot tamsay\u0131 bir \u00f6zet de\u011feri \u00fcretir.<\/li>\n\n<li>\u00dcretilen hash de\u011feri, arka plandaki tablonun boyutuna g\u00f6re mod\u00fcler bir i\u015flemden ge\u00e7irilerek dizideki hangi kovaya (indekse) yerle\u015fece\u011fi hesaplan\u0131r.<\/li>\n\n<li>E\u011fer iki farkl\u0131 anahtar ayn\u0131 kova indeksine denk gelirse &#8220;Hash Collision&#8221; (\u00e7ak\u0131\u015fma) olu\u015fur. Java, ayn\u0131 kovaya denk gelen elemanlar\u0131 birbirine ba\u011fl\u0131 liste (LinkedList) mant\u0131\u011f\u0131yla ba\u011flar. Java 8 ile birlikte, bir kovadaki eleman say\u0131s\u0131 belirli bir e\u015fi\u011fi (varsay\u0131lan olarak 8) a\u015ft\u0131\u011f\u0131nda bu liste otomatik olarak k\u0131rm\u0131z\u0131-siyah a\u011faca (Red-Black Tree) d\u00f6n\u00fc\u015ft\u00fcr\u00fcl\u00fcr. Bu optimizasyon arama s\u00fcresini O(n) seviyesinden O(log n) seviyesine indirir.<\/li>\n\n<li>Bir anahtara g\u00f6re de\u011fer arand\u0131\u011f\u0131nda yine anahtar\u0131n hash kodu hesaplan\u0131r, ilgili kovaya gidilir ve kovadaki elemanlar <code>equals()<\/code> metodu ile kar\u015f\u0131la\u015ft\u0131r\u0131larak do\u011fru nesne bulunur.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Bu mekanizma nedeniyle anahtar olarak kullan\u0131lan s\u0131n\u0131flar\u0131n <code>equals()<\/code> ve <code>hashCode()<\/code> metotlar\u0131n\u0131 do\u011fru ve tutarl\u0131 bir \u015fekilde ezmesi (override etmesi) hayati \u00f6nem ta\u015f\u0131r. <code>String<\/code> ve <code>Integer<\/code> gibi Java&#8217;n\u0131n yerle\u015fik s\u0131n\u0131flar\u0131 bu metotlar\u0131 zaten do\u011fru uygulad\u0131\u011f\u0131 ve de\u011fi\u015ftirilemez (immutable) olduklar\u0131 i\u00e7in anahtar olarak s\u0131kl\u0131kla tercih edilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Temel Metotlar ve Kod \u00d6rne\u011fi<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap ile \u00e7al\u0131\u015f\u0131rken en s\u0131k ba\u015fvurulan metotlar <code>put()<\/code>, <code>get()<\/code>, <code>containsKey()<\/code>, <code>remove()<\/code> ve <code>size()<\/code> metotlar\u0131d\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\u015fa\u011f\u0131daki \u00f6rnekte kullan\u0131c\u0131 kimlikleri ile kullan\u0131c\u0131 adlar\u0131n\u0131 tutan bir HashMap \u00f6rne\u011fi yer almaktad\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.HashMap;\n\npublic class HashMapOrnek {\n    public static void main(String[] args) {\n        HashMap&lt;String, String&gt; kullanicilar = new HashMap&lt;&gt;();\n\n        \/\/ Veri ekleme\n        kullanicilar.put(\"usr101\", \"Ahmet Yilmaz\");\n        kullanicilar.put(\"usr102\", \"Ayse Demir\");\n        kullanicilar.put(\"usr103\", \"Mehmet Kaya\");\n\n        \/\/ Var olan anahtara yeni deger atama (uzerine yazar)\n        kullanicilar.put(\"usr101\", \"Ahmet Can Yilmaz\");\n\n        \/\/ Veri okuma\n        String kullanici = kullanicilar.get(\"usr102\");\n        System.out.println(\"Sorgulanan Kullanici: \" + kullanici);\n\n        \/\/ Anahtar kontrolu\n        if (kullanicilar.containsKey(\"usr103\")) {\n            System.out.println(\"usr103 sistemde kayitli.\");\n        }\n\n        \/\/ Eleman silme\n        kullanicilar.remove(\"usr103\");\n\n        \/\/ Eleman sayisi\n        System.out.println(\"Toplam Kullanici: \" + kullanicilar.size());\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Yukar\u0131daki kod blo\u011funda:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>HashMap&lt;String, String&gt;<\/code> tan\u0131m\u0131 ile hem anahtar\u0131n hem de de\u011ferin metin tabanl\u0131 olaca\u011f\u0131 belirtilmi\u015ftir.<\/li>\n\n<li><code>put()<\/code> metoduyla veriler eklenmi\u015f, ayn\u0131 anahtar (&#8220;usr101&#8221;) tekrar kullan\u0131ld\u0131\u011f\u0131nda eski de\u011fer g\u00fcncellenmi\u015ftir.<\/li>\n\n<li><code>get()<\/code> metodu verilen anahtara ait de\u011feri d\u00f6nd\u00fcrm\u00fc\u015ft\u00fcr; e\u011fer anahtar bulunamasayd\u0131 <code>null<\/code> d\u00f6necekti.<\/li>\n\n<li><code>containsKey()<\/code> metodu harita i\u00e7inde ilgili anahtar\u0131n olup olmad\u0131\u011f\u0131n\u0131 do\u011frulam\u0131\u015ft\u0131r.<\/li>\n\n<li><code>remove()<\/code> ile kay\u0131t silinmi\u015f ve <code>size()<\/code> ile g\u00fcncel eleman adedi ekrana yazd\u0131r\u0131lm\u0131\u015ft\u0131r.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">HashMap \u00dczerinde Gezinme (Iteration)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap i\u00e7erisindeki t\u00fcm verileri ekrana yazd\u0131rmak veya i\u015flemek i\u00e7in farkl\u0131 yakla\u015f\u0131mlar mevcuttur. Performans a\u00e7\u0131s\u0131ndan hem anahtara hem de de\u011fere ihtiya\u00e7 duyulan durumlarda <code>entrySet()<\/code> kullan\u0131m\u0131 en verimli yoldur.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.HashMap;\nimport java.util.Map;\n\npublic class HashMapGezinme {\n    public static void main(String[] args) {\n        HashMap&lt;String, Integer&gt; stoklar = new HashMap&lt;&gt;();\n        stoklar.put(\"Klavye\", 45);\n        stoklar.put(\"Fare\", 120);\n        stoklar.put(\"Monitor\", 18);\n\n        \/\/ entrySet kullanarak tum ciftler uzerinde donme\n        for (Map.Entry&lt;String, Integer&gt; kayit : stoklar.entrySet()) {\n            System.out.println(\"Urun: \" + kayit.getKey() + \" - Stok Adedi: \" + kayit.getValue());\n        }\n\n        \/\/ Sadece anahtarlar uzerinde donme\n        for (String urunAdi : stoklar.keySet()) {\n            System.out.println(\"Mevcut Urun: \" + urunAdi);\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu \u00f6rnekte yer alan <code>entrySet()<\/code> metodu, koleksiyondaki her bir anahtar-de\u011fer ikilisini temsil eden bir <code>Map.Entry<\/code> k\u00fcmesi d\u00f6nd\u00fcr\u00fcr. Bu y\u00f6ntem, her ad\u0131mda haritadan yeniden <code>get()<\/code> sorgusu yapma maliyetini ortadan kald\u0131r\u0131r. Yaln\u0131zca anahtarlar gerekliyse <code>keySet()<\/code>, yaln\u0131zca de\u011ferler gerekliyse <code>values()<\/code> metodu kullan\u0131l\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HashMap Kullan\u0131rken Dikkat Edilmesi Gerekenler<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HashMap s\u0131ral\u0131 de\u011fildir. E\u011fer verilerin ekleme s\u0131ras\u0131yla tutulmas\u0131 gerekiyorsa <code>LinkedHashMap<\/code>, anahtarlar\u0131n do\u011fal s\u0131ralamas\u0131yla (veya bir Comparator ile) dizilmesi gerekiyorsa <code>TreeMap<\/code> tercih edilmelidir.<\/li>\n\n<li>\u00c7oklu i\u015f par\u00e7ac\u0131\u011f\u0131 (concurrency) bar\u0131nd\u0131ran uygulamalarda HashMap veri bozulmalar\u0131na neden olabilir. E\u015fzamanl\u0131 i\u015flemler i\u00e7in <code>ConcurrentHashMap<\/code> kullan\u0131m\u0131 en g\u00fcvenli yoldur.<\/li>\n\n<li>Kapasite ve doluluk fakt\u00f6r\u00fc (Load Factor) performans\u0131 etkiler. Varsay\u0131lan ba\u015flang\u0131\u00e7 kapasitesi 16, doluluk oran\u0131 ise 0.75&#8217;tir. B\u00fcy\u00fck hacimli verilerde yeniden boyutland\u0131rma maliyetini azaltmak i\u00e7in ba\u015flang\u0131\u00e7 kapasitesi \u00f6nceden tan\u0131mlanabilir.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u00d6zet ve Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java&#8217;da HashMap, y\u00fcksek arama ve ekleme performans\u0131 sunan, anahtar-de\u011fer modelini temel alan en yayg\u0131n veri yap\u0131s\u0131d\u0131r. Arka planda \u00e7al\u0131\u015fan hashing mimarisini kavramak, olas\u0131 performans darbo\u011fazlar\u0131n\u0131n ve mant\u0131k hatalar\u0131n\u0131n \u00f6n\u00fcne ge\u00e7meyi sa\u011flar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bir sonraki ad\u0131mda, nesneleri HashMap anahtar\u0131 olarak kullan\u0131rken <code>equals<\/code> ve <code>hashCode<\/code> s\u00f6zle\u015fmesinin nas\u0131l uygulanmas\u0131 gerekti\u011fini inceleyebilir veya thread-safe mimariler i\u00e7in <code>ConcurrentHashMap<\/code> yap\u0131s\u0131n\u0131n i\u00e7 detaylar\u0131na ge\u00e7i\u015f yapabilirsiniz.<\/p>","protected":false},"excerpt":{"rendered":"<p>Java Collections Framework i\u00e7inde yer alan HashMap yap\u0131s\u0131n\u0131n mant\u0131\u011f\u0131n\u0131, arka plandaki \u00e7al\u0131\u015fma mekanizmas\u0131n\u0131 ve temel kullan\u0131m ad\u0131mlar\u0131n\u0131 ke\u015ffedin.<\/p>","protected":false},"author":1,"featured_media":10207,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[227],"tags":[349,245,348,263,266],"class_list":["post-10206","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-collections-framework","tag-java","tag-java-hashmap","tag-veri-yapilari","tag-yazilim-gelistirme"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Java&#039;da HashMap Nedir? - Yunus KAYTAN<\/title>\n<meta name=\"description\" content=\"Java HashMap nedir, nas\u0131l \u00e7al\u0131\u015f\u0131r ve nas\u0131l kullan\u0131l\u0131r? 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