{"id":30612,"date":"2025-09-29T20:41:54","date_gmt":"2025-09-29T17:41:54","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=30612"},"modified":"2025-09-29T20:41:54","modified_gmt":"2025-09-29T17:41:54","slug":"giris-javada-listeler-neden-onemlidir","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/giris-javada-listeler-neden-onemlidir\/","title":{"rendered":"Giri\u015f: Java&#8217;da Listeler Neden \u00d6nemlidir?"},"content":{"rendered":"<p><body><\/p>\n<h2>Giri\u015f: Java&#8217;da Listeler Neden \u00d6nemlidir?<\/h2>\n<p>Java&#8217;da veri yap\u0131lar\u0131, programlar\u0131m\u0131z\u0131n veriyi etkin bir \u015fekilde depolamas\u0131 ve i\u015flemesi i\u00e7in temel ta\u015flard\u0131r. Bu yap\u0131lar\u0131n en s\u0131k kullan\u0131lanlar\u0131ndan biri de &#8220;Listeler&#8221;dir. Java Collections Framework&#8217;\u00fcn \u00f6nemli bir par\u00e7as\u0131 olan List aray\u00fcz\u00fc, elemanlar\u0131 belirli bir s\u0131rada tutan ve indeks tabanl\u0131 eri\u015fime izin veren dinamik boyutlu bir koleksiyon t\u00fcr\u00fcd\u00fcr.<\/p>\n<p>Geleneksel dizilerin (array) aksine, Listeler dinamik olarak boyutlar\u0131n\u0131 de\u011fi\u015ftirebilirler. Bu, programlama s\u0131ras\u0131nda ka\u00e7 eleman depolayaca\u011f\u0131m\u0131z\u0131 kesin olarak bilmedi\u011fimiz durumlarda b\u00fcy\u00fck bir avantaj sa\u011flar. \u00d6rne\u011fin, bir kullan\u0131c\u0131n\u0131n sepetindeki \u00fcr\u00fcnleri, bir veritaban\u0131ndan \u00e7ekilen kay\u0131tlar\u0131 veya bir dosyadaki sat\u0131rlar\u0131 depolamak i\u00e7in Listeler idealdir. Listeler, elemanlar\u0131n eklenme s\u0131ras\u0131n\u0131 korur ve ayn\u0131 elemandan birden fazla kez bulundurmaya (duplikatlara) izin verir. Bu rehberde, Java&#8217;da Listelerin nas\u0131l kullan\u0131laca\u011f\u0131n\u0131, farkl\u0131 uygulama t\u00fcrlerini, temel ve geli\u015fmi\u015f i\u015flemlerini ve pratik ipu\u00e7lar\u0131n\u0131 detayl\u0131 bir \u015fekilde inceleyece\u011fiz.<\/p>\n<h2>Java&#8217;da List Aray\u00fcz\u00fc ve Temel Uygulamalar\u0131<\/h2>\n<p>Java&#8217;da <code>List<\/code>, <code>java.util<\/code> paketinde tan\u0131mlanm\u0131\u015f bir aray\u00fczd\u00fcr. Bu aray\u00fcz, s\u0131ral\u0131 bir koleksiyonu temsil eder ve elemanlara indeksleri arac\u0131l\u0131\u011f\u0131yla eri\u015fim, ekleme, silme gibi standart i\u015flemleri tan\u0131mlar. <code>List<\/code> aray\u00fcz\u00fcn\u00fcn bir\u00e7ok farkl\u0131 uygulamas\u0131 (implementation) bulunur, ancak en yayg\u0131n ve bilinenleri <code>ArrayList<\/code> ve <code>LinkedList<\/code>&#8216;tir.<\/p>\n<h3>ArrayList<\/h3>\n<p><code>ArrayList<\/code>, <code>List<\/code> aray\u00fcz\u00fcn\u00fcn dizi (array) tabanl\u0131 bir uygulamas\u0131d\u0131r. Dahili olarak dinamik bir dizi kullan\u0131r. Bu yap\u0131s\u0131 nedeniyle:<\/p>\n<ul>\n<li><b>Elemanlara Eri\u015fim:<\/b> Bir elemana indeksi \u00fczerinden eri\u015fim (<code>get(index)<\/code>) \u00e7ok h\u0131zl\u0131d\u0131r, \u00e7\u00fcnk\u00fc dizilerde bu i\u015flem do\u011frudan bellek adresine giderek ger\u00e7ekle\u015ftirilir (O(1) zaman karma\u015f\u0131kl\u0131\u011f\u0131).<\/li>\n<li><b>Eleman Ekleme\/Silme:<\/b> Listenin sonuna eleman eklemek genellikle h\u0131zl\u0131d\u0131r (O(1)). Ancak, listenin ba\u015f\u0131na veya ortas\u0131na eleman eklemek veya silmek, sonraki t\u00fcm elemanlar\u0131n kayd\u0131r\u0131lmas\u0131n\u0131 gerektirdi\u011fi i\u00e7in daha maliyetlidir (O(n) zaman karma\u015f\u0131kl\u0131\u011f\u0131).<\/li>\n<li><b>Haf\u0131za Kullan\u0131m\u0131:<\/b> Genellikle <code>LinkedList<\/code>&#8216;e g\u00f6re daha az haf\u0131za kullan\u0131r, \u00e7\u00fcnk\u00fc her eleman i\u00e7in ek bir ba\u011flay\u0131c\u0131 (pointer) bilgisi tutulmaz.<\/li>\n<\/ul>\n<p><b>Ne Zaman Kullan\u0131l\u0131r?<\/b> E\u011fer elemanlara s\u0131k\u00e7a indeks \u00fczerinden eri\u015fmeniz veya listenin sonuna eleman eklemeniz gerekiyorsa, <code>ArrayList<\/code> tercih edilmelidir.<\/p>\n<pre><code class=\"language-java\">\nimport java.util.ArrayList;\nimport java.util.List;\n\npublic class ArrayListOrnegi {\n    public static void main(String[] args) {\n        \/\/ String t\u00fcr\u00fcnde bir ArrayList olu\u015fturma\n        List<String> urunler = new ArrayList<>();\n        urunler.add(\"Laptop\");\n        urunler.add(\"Klavye\");\n        urunler.add(\"Mouse\");\n\n        System.out.println(\"\u00dcr\u00fcnler: \" + urunler); \/\/ \u00c7\u0131kt\u0131: [Laptop, Klavye, Mouse]\n    }\n}\n<\/code><\/pre>\n<h3>LinkedList<\/h3>\n<p><code>LinkedList<\/code>, <code>List<\/code> aray\u00fcz\u00fcn\u00fcn \u00e7ift y\u00f6nl\u00fc ba\u011fl\u0131 liste tabanl\u0131 bir uygulamas\u0131d\u0131r. Her eleman (node), kendinden \u00f6nceki ve sonraki eleman\u0131n referans\u0131n\u0131 i\u00e7erir. Bu yap\u0131s\u0131 nedeniyle:<\/p>\n<ul>\n<li><b>Elemanlara Eri\u015fim:<\/b> Bir elemana indeksi \u00fczerinden eri\u015fim (<code>get(index)<\/code>) yava\u015ft\u0131r, \u00e7\u00fcnk\u00fc istenen elemana ula\u015fmak i\u00e7in listenin ba\u015f\u0131ndan veya sonundan itibaren elemanlar tek tek gezilmelidir (O(n) zaman karma\u015f\u0131kl\u0131\u011f\u0131).<\/li>\n<li><b>Eleman Ekleme\/Silme:<\/b> Listenin ba\u015f\u0131na, sonuna veya ortas\u0131na eleman eklemek veya silmek \u00e7ok h\u0131zl\u0131d\u0131r (O(1) zaman karma\u015f\u0131kl\u0131\u011f\u0131), \u00e7\u00fcnk\u00fc sadece ilgili elemanlar\u0131n referanslar\u0131 g\u00fcncellenir.<\/li>\n<li><b>Haf\u0131za Kullan\u0131m\u0131:<\/b> Her eleman i\u00e7in ek olarak \u00f6nceki ve sonraki eleman\u0131n referans\u0131n\u0131 tuttu\u011fu i\u00e7in <code>ArrayList<\/code>&#8216;e g\u00f6re daha fazla haf\u0131za kullan\u0131r.<\/li>\n<\/ul>\n<p><b>Ne Zaman Kullan\u0131l\u0131r?<\/b> E\u011fer listenin ba\u015f\u0131na, ortas\u0131na veya sonuna s\u0131k\u00e7a eleman eklemeniz veya silmeniz gerekiyorsa, <code>LinkedList<\/code> tercih edilmelidir.<\/p>\n<pre><code class=\"language-java\">\nimport java.util.LinkedList;\nimport java.util.List;\n\npublic class LinkedListOrnegi {\n    public static void main(String[] args) {\n        \/\/ Integer t\u00fcr\u00fcnde bir LinkedList olu\u015fturma\n        List<Integer> sayilar = new LinkedList<>();\n        sayilar.add(10);\n        sayilar.add(20);\n        sayilar.add(0, 5); \/\/ Ba\u015fa 5 ekle\n\n        System.out.println(\"Say\u0131lar: \" + sayilar); \/\/ \u00c7\u0131kt\u0131: [5, 10, 20]\n    }\n}\n<\/code><\/pre>\n<h3>Vector (K\u0131saca)<\/h3>\n<p><code>Vector<\/code>, <code>ArrayList<\/code>&#8216;e benzer \u015fekilde dizi tabanl\u0131d\u0131r ancak senkronize (thread-safe) bir s\u0131n\u0131ft\u0131r. Bu, \u00e7oklu i\u015f par\u00e7ac\u0131kl\u0131 (multi-threaded) ortamlarda g\u00fcvenli oldu\u011fu anlam\u0131na gelir, ancak tek i\u015f par\u00e7ac\u0131kl\u0131 ortamlarda performans maliyeti getirir. Genellikle modern Java uygulamalar\u0131nda <code>ArrayList<\/code> veya <code>Collections.synchronizedList()<\/code> ile senkronize edilmi\u015f bir <code>ArrayList<\/code> tercih edilir.<\/p>\n<h2>Listelerle Temel \u0130\u015flemler<\/h2>\n<p><code>List<\/code> aray\u00fcz\u00fc, elemanlar\u0131 y\u00f6netmek i\u00e7in zengin bir metod seti sunar. \u0130\u015fte en s\u0131k kullan\u0131lan temel i\u015flemler:<\/p>\n<h3>Eleman Ekleme<\/h3>\n<ul>\n<li><code>add(E e)<\/code>: Belirtilen eleman\u0131 listenin sonuna ekler.<\/li>\n<li><code>add(int index, E element)<\/code>: Belirtilen eleman\u0131 belirtilen indekse ekler. Mevcut elemanlar sa\u011fa kayd\u0131r\u0131l\u0131r.<\/li>\n<\/ul>\n<pre><code class=\"language-java\">\nList<String> meyveler = new ArrayList<>();\nmeyveler.add(\"Elma\");\nmeyveler.add(\"Armut\");\nmeyveler.add(1, \"Muz\"); \/\/ Elma, Muz, Armut\nSystem.out.println(meyveler); \/\/ \u00c7\u0131kt\u0131: [Elma, Muz, Armut]\n<\/code><\/pre>\n<h3>Elemana Eri\u015fim<\/h3>\n<ul>\n<li><code>get(int index)<\/code>: Belirtilen indeksteki eleman\u0131 d\u00f6nd\u00fcr\u00fcr.<\/li>\n<\/ul>\n<pre><code class=\"language-java\">\nString ilkMeyve = meyveler.get(0); \/\/ Elma\nSystem.out.println(\"\u0130lk meyve: \" + ilkMeyve); \/\/ \u00c7\u0131kt\u0131: \u0130lk meyve: Elma\n<\/code><\/pre>\n<h3>Eleman G\u00fcncelleme<\/h3>\n<ul>\n<li><code>set(int index, E element)<\/code>: Belirtilen indeksteki eleman\u0131 belirtilen elemanla de\u011fi\u015ftirir ve eski eleman\u0131 d\u00f6nd\u00fcr\u00fcr.<\/li>\n<\/ul>\n<pre><code class=\"language-java\">\nmeyveler.set(1, \"\u00c7ilek\"); \/\/ Elma, \u00c7ilek, Armut\nSystem.out.println(meyveler); \/\/ \u00c7\u0131kt\u0131: [Elma, \u00c7ilek, Armut]\n<\/code><\/pre>\n<h3>Eleman Silme<\/h3>\n<ul>\n<li><code>remove(int index)<\/code>: Belirtilen indeksteki eleman\u0131 siler ve silinen eleman\u0131 d\u00f6nd\u00fcr\u00fcr.<\/li>\n<li><code>remove(Object o)<\/code>: Belirtilen eleman\u0131n ilk ge\u00e7ti\u011fi yeri siler (varsa) ve silinip silinmedi\u011fini belirten bir boolean de\u011fer d\u00f6nd\u00fcr\u00fcr.<\/li>\n<\/ul>\n<pre><code class=\"language-java\">\nmeyveler.remove(0); \/\/ \u00c7ilek, Armut\nSystem.out.println(meyveler); \/\/ \u00c7\u0131kt\u0131: [\u00c7ilek, Armut]\n\nboolean silindiMi = meyveler.remove(\"Armut\"); \/\/ \u00c7ilek\nSystem.out.println(\"Armut silindi mi? \" + silindiMi); \/\/ \u00c7\u0131kt\u0131: Armut silindi mi? true\nSystem.out.println(meyveler); \/\/ \u00c7\u0131kt\u0131: [\u00c7ilek]\n<\/code><\/pre>\n<h3>Liste Bilgileri<\/h3>\n<ul>\n<li><code>size()<\/code>: Listedeki eleman say\u0131s\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr.<\/li>\n<li><code>isEmpty()<\/code>: Liste bo\u015fsa <code>true<\/code>, aksi takdirde <code>false<\/code> d\u00f6nd\u00fcr\u00fcr.<\/li>\n<li><code>contains(Object o)<\/code>: Belirtilen eleman\u0131 i\u00e7eriyorsa <code>true<\/code>, aksi takdirde <code>false<\/code> d\u00f6nd\u00fcr\u00fcr.<\/li>\n<li><code>indexOf(Object o)<\/code>: Belirtilen eleman\u0131n ilk ge\u00e7ti\u011fi yerin indeksini d\u00f6nd\u00fcr\u00fcr. Bulunamazsa -1 d\u00f6nd\u00fcr\u00fcr.<\/li>\n<li><code>clear()<\/code>: Listedeki t\u00fcm elemanlar\u0131 siler.<\/li>\n<\/ul>\n<pre><code class=\"language-java\">\nSystem.out.println(\"Liste boyutu: \" + meyveler.size()); \/\/ \u00c7\u0131kt\u0131: Liste boyutu: 1\nSystem.out.println(\"Liste bo\u015f mu? \" + meyveler.isEmpty()); \/\/ \u00c7\u0131kt\u0131: Liste bo\u015f mu? false\nSystem.out.println(\"\u00c7ilek i\u00e7eriyor mu? \" + meyveler.contains(\"\u00c7ilek\")); \/\/ \u00c7\u0131kt\u0131: \u00c7ilek i\u00e7eriyor mu? true\nSystem.out.println(\"\u00c7ilek'in indeksi: \" + meyveler.indexOf(\"\u00c7ilek\")); \/\/ \u00c7\u0131kt\u0131: \u00c7ilek'in indeksi: 0\n\nmeyveler.clear();\nSystem.out.println(\"Liste bo\u015f mu (temizlendikten sonra)? \" + meyveler.isEmpty()); \/\/ \u00c7\u0131kt\u0131: Liste bo\u015f mu (temizlendikten sonra)? true\n<\/code><\/pre>\n<h3>Listede Gezinme (Iterasyon)<\/h3>\n<p>Listelerdeki elemanlar \u00fczerinde \u00e7e\u015fitli yollarla d\u00f6ng\u00fc kurulabilir:<\/p>\n<pre><code class=\"language-java\">\nList<String> sehirler = new ArrayList<>();\nsehirler.add(\"Ankara\");\nsehirler.add(\"\u0130stanbul\");\nsehirler.add(\"\u0130zmir\");\n\n\/\/ 1. Geleneksel for d\u00f6ng\u00fcs\u00fc\nSystem.out.println(\"--- Geleneksel for d\u00f6ng\u00fcs\u00fc ---\");\nfor (int i = 0; i < sehirler.size(); i++) {\n    System.out.println(sehirler.get(i));\n}\n\n\/\/ 2. Geli\u015fmi\u015f for-each d\u00f6ng\u00fcs\u00fc (Java 5+)\nSystem.out.println(\"--- For-each d\u00f6ng\u00fcs\u00fc ---\");\nfor (String sehir : sehirler) {\n    System.out.println(sehir);\n}\n\n\/\/ 3. Iterator kullan\u0131m\u0131\nimport java.util.Iterator;\nSystem.out.println(\"--- Iterator kullan\u0131m\u0131 ---\");\nIterator<String> iterator = sehirler.iterator();\nwhile (iterator.hasNext()) {\n    System.out.println(iterator.next());\n}\n<\/code><\/pre>\n<h2>Geli\u015fmi\u015f Konular ve Pratik \u0130pu\u00e7lar\u0131<\/h2>\n<h3>Generics (Jenerikler) ile Tip G\u00fcvenli\u011fi<\/h3>\n<p>Java 5 ile tan\u0131t\u0131lan Generics, koleksiyonlar\u0131n hangi t\u00fcrden elemanlar\u0131 tutaca\u011f\u0131n\u0131 belirtmemizi sa\u011flar. Bu, derleme zaman\u0131nda tip hatalar\u0131n\u0131 yakalamam\u0131za yard\u0131mc\u0131 olur ve <code>ClassCastException<\/code> gibi \u00e7al\u0131\u015fma zaman\u0131 hatalar\u0131n\u0131 \u00f6nler. Her zaman Generics kullan\u0131n!<\/p>\n<pre><code class=\"language-java\">\n\/\/ K\u00f6t\u00fc \u00f6rnek (Generics yok, tip g\u00fcvenli\u011fi zay\u0131f)\nList hamListe = new ArrayList();\nhamListe.add(\"Merhaba\");\nhamListe.add(123); \/\/ Farkl\u0131 tipte eleman eklenebilir\n\n\/\/ \u0130yi \u00f6rnek (Generics ile tip g\u00fcvenli\u011fi sa\u011flan\u0131r)\nList<String> guvenliListe = new ArrayList<>();\nguvenliListe.add(\"D\u00fcnya\");\n\/\/ guvenliListe.add(456); \/\/ Derleme hatas\u0131 verir: int, String'e d\u00f6n\u00fc\u015ft\u00fcr\u00fclemez\n<\/code><\/pre>\n<h3>ListIterator<\/h3>\n<p><code>Iterator<\/code>&#8216;a ek olarak, <code>List<\/code> aray\u00fcz\u00fc <code>ListIterator<\/code>&#8216;\u0131 da destekler. <code>ListIterator<\/code>, listelerde hem ileri hem de geri y\u00f6nde gezinme, eleman ekleme, eleman silme ve eleman de\u011fi\u015ftirme gibi daha geli\u015fmi\u015f i\u015flemler yapman\u0131z\u0131 sa\u011flar.<\/p>\n<pre><code class=\"language-java\">\nimport java.util.ListIterator;\n\nList<String> harfler = new ArrayList<>();\nharfler.add(\"A\");\nharfler.add(\"B\");\nharfler.add(\"C\");\n\nListIterator<String> listIterator = harfler.listIterator();\nwhile (listIterator.hasNext()) {\n    String harf = listIterator.next();\n    if (harf.equals(\"B\")) {\n        listIterator.set(\"X\"); \/\/ B'yi X ile de\u011fi\u015ftir\n    }\n}\nSystem.out.println(harfler); \/\/ \u00c7\u0131kt\u0131: [A, X, C]\n\n\/\/ Geriye do\u011fru gezinme\nwhile (listIterator.hasPrevious()) {\n    System.out.println(\"Geriye: \" + listIterator.previous());\n}\n<\/code><\/pre>\n<h3>De\u011fi\u015fmez (Immutable) Listeler<\/h3>\n<p>Java 9&#8217;dan itibaren, <code>List.of()<\/code> statik fabrika metodu ile de\u011fi\u015fmez listeler olu\u015fturabilirsiniz. Bu listeler olu\u015fturulduktan sonra eleman eklenemez, \u00e7\u0131kar\u0131lamaz veya de\u011fi\u015ftirilemez. Bu, \u00f6zellikle thread g\u00fcvenli\u011fi ve veri b\u00fct\u00fcnl\u00fc\u011f\u00fc i\u00e7in faydal\u0131d\u0131r.<\/p>\n<pre><code class=\"language-java\">\nimport java.util.List;\n\nList<String> sabitRenkler = List.of(\"K\u0131rm\u0131z\u0131\", \"Ye\u015fil\", \"Mavi\");\nSystem.out.println(sabitRenkler); \/\/ \u00c7\u0131kt\u0131: [K\u0131rm\u0131z\u0131, Ye\u015fil, Mavi]\n\n\/\/ sabitRenkler.add(\"Sar\u0131\"); \/\/ UnsupportedOperationException hatas\u0131 verir\n<\/code><\/pre>\n<h3>Performans \u0130pu\u00e7lar\u0131: ArrayList vs LinkedList<\/h3>\n<ul>\n<li><b><code>ArrayList<\/code> ne zaman?<\/b>\n<ul>\n<li>S\u0131k\u00e7a indeks tabanl\u0131 eri\u015fim (<code>get()<\/code>) yap\u0131l\u0131yorsa.<\/li>\n<li>Listeye genellikle sonundan eleman ekleniyorsa (<code>add()<\/code>).<\/li>\n<li>K\u00fc\u00e7\u00fck listeler i\u00e7in ba\u015flang\u0131\u00e7ta performans\u0131 genellikle daha iyidir.<\/li>\n<\/ul>\n<\/li>\n<li><b><code>LinkedList<\/code> ne zaman?<\/b>\n<ul>\n<li>S\u0131k\u00e7a listenin ba\u015f\u0131na veya ortas\u0131na eleman ekleniyor veya siliniyorsa.<\/li>\n<li><code>ListIterator<\/code> ile ileri-geri gezinme ve eleman ekleme\/silme i\u015flemleri yap\u0131lacaksa.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Genel bir kural olarak, \u00e7o\u011fu senaryoda <code>ArrayList<\/code> iyi bir ba\u015flang\u0131\u00e7 noktas\u0131d\u0131r. Performans darbo\u011fazlar\u0131 fark edildi\u011finde veya \u00f6zel durumlar gerekti\u011finde <code>LinkedList<\/code> gibi di\u011fer uygulamalar d\u00fc\u015f\u00fcn\u00fclmelidir.<\/p>\n<h3>Thread G\u00fcvenli\u011fi<\/h3>\n<p><code>ArrayList<\/code> ve <code>LinkedList<\/code> senkronize de\u011fildir (thread-safe de\u011fillerdir). Birden fazla i\u015f par\u00e7ac\u0131\u011f\u0131 ayn\u0131 anda bu listelere eri\u015fip de\u011fi\u015ftirmeye \u00e7al\u0131\u015f\u0131rsa beklenmedik sonu\u00e7lar veya hatalar olu\u015fabilir. Thread g\u00fcvenli\u011fi sa\u011flamak i\u00e7in:<\/p>\n<ul>\n<li><code>Collections.synchronizedList(List<T> list)<\/code> metodunu kullanabilirsiniz. Bu, mevcut listeyi senkronize bir sarmalay\u0131c\u0131 ile d\u00f6nd\u00fcr\u00fcr.<\/li>\n<li><code>java.util.concurrent.CopyOnWriteArrayList<\/code> s\u0131n\u0131f\u0131n\u0131 kullanabilirsiniz. Bu s\u0131n\u0131f, her de\u011fi\u015fiklikte listenin yeni bir kopyas\u0131n\u0131 olu\u015fturarak thread g\u00fcvenli\u011fi sa\u011flar, ancak b\u00fcy\u00fck listeler ve s\u0131k yazma i\u015flemleri i\u00e7in performansl\u0131 de\u011fildir.<\/li>\n<\/ul>\n<h2>Sonu\u00e7 ve S\u0131k\u00e7a Sorulan Sorular (SSS)<\/h2>\n<p>Java&#8217;daki Listeler, dinamik ve s\u0131ral\u0131 veri depolama ihtiyac\u0131n\u0131 kar\u015f\u0131layan vazge\u00e7ilmez veri yap\u0131lar\u0131d\u0131r. <code>ArrayList<\/code> ve <code>LinkedList<\/code> gibi farkl\u0131 uygulamalar\u0131 sayesinde, uygulaman\u0131z\u0131n \u00f6zel ihtiya\u00e7lar\u0131na g\u00f6re en uygun \u00e7\u00f6z\u00fcm\u00fc se\u00e7me esnekli\u011fine sahipsiniz. Generics kullan\u0131m\u0131yla tip g\u00fcvenli\u011fini sa\u011flamak, <code>ListIterator<\/code> ile geli\u015fmi\u015f gezinme ve Java 9 ile gelen de\u011fi\u015fmez listeler gibi \u00f6zellikler, Listelerin g\u00fcc\u00fcn\u00fc ve esnekli\u011fini daha da art\u0131rmaktad\u0131r. Do\u011fru liste t\u00fcr\u00fcn\u00fc se\u00e7mek ve temel i\u015flemleri etkin bir \u015fekilde kullanmak, daha performansl\u0131 ve hatas\u0131z Java uygulamalar\u0131 geli\u015ftirmenizin anahtarlar\u0131ndan biridir.<\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular (SSS)<\/h3>\n<p><b>1. <code>ArrayList<\/code> ve <code>LinkedList<\/code> aras\u0131ndaki temel fark nedir?<\/b><\/p>\n<p><code>ArrayList<\/code> dahili olarak dinamik bir dizi kullan\u0131r ve indeks tabanl\u0131 eri\u015fimde h\u0131zl\u0131d\u0131r (O(1)), ancak ortadan ekleme\/silme yava\u015ft\u0131r (O(n)). <code>LinkedList<\/code> ise \u00e7ift y\u00f6nl\u00fc ba\u011fl\u0131 liste kullan\u0131r ve ortadan ekleme\/silme h\u0131zl\u0131d\u0131r (O(1)), ancak indeks tabanl\u0131 eri\u015fim yava\u015ft\u0131r (O(n)).<\/p>\n<p><b>2. Bir Listeyi nas\u0131l senkronize ederim (thread-safe yapar\u0131m)?<\/b><\/p>\n<p>Senkronize olmayan bir Listeyi (\u00f6rn. <code>ArrayList<\/code>) senkronize etmek i\u00e7in <code>Collections.synchronizedList(myList)<\/code> metodunu kullanabilirsiniz. Alternatif olarak, <code>java.util.concurrent.CopyOnWriteArrayList<\/code> s\u0131n\u0131f\u0131n\u0131 da kullanabilirsiniz, ancak bu s\u0131n\u0131f\u0131n performans karakteristikleri farkl\u0131d\u0131r.<\/p>\n<p><b>3. <code>List<\/code> yerine ne zaman <code>Set<\/code> veya <code>Map<\/code> kullanmal\u0131y\u0131m?<\/b><\/p>\n<ul>\n<li><b><code>Set<\/code>:<\/b> E\u011fer elemanlar\u0131n s\u0131ras\u0131 \u00f6nemli de\u011filse ve yaln\u0131zca benzersiz elemanlar depolamak istiyorsan\u0131z (duplikatlara izin vermiyorsan\u0131z) <code>Set<\/code> kullanmal\u0131s\u0131n\u0131z (\u00f6rn. <code>HashSet<\/code>, <code>TreeSet<\/code>).<\/li>\n<li><b><code>Map<\/code>:<\/b> E\u011fer veriyi anahtar-de\u011fer \u00e7iftleri halinde depolamak ve anahtarlar arac\u0131l\u0131\u011f\u0131yla de\u011ferlere h\u0131zl\u0131ca eri\u015fmek istiyorsan\u0131z <code>Map<\/code> kullanmal\u0131s\u0131n\u0131z (\u00f6rn. <code>HashMap<\/code>, <code>TreeMap<\/code>).<\/li>\n<\/ul>\n<p><b>4. <code>List.of()<\/code> ile olu\u015fturulan liste neden de\u011fi\u015ftirilemez (immutable)?<\/b><\/p>\n<p><code>List.of()<\/code> ile olu\u015fturulan listeler, Java 9&#8217;dan itibaren gelen &#8220;factory methods for immutable collections&#8221; (de\u011fi\u015fmez koleksiyonlar i\u00e7in fabrika metotlar\u0131) \u00f6zelli\u011fidir. Bu listeler olu\u015fturulduktan sonra eleman eklenemez, \u00e7\u0131kar\u0131lamaz veya de\u011fi\u015ftirilemez. Bu, verinin b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc garanti alt\u0131na almak ve \u00f6zellikle \u00e7oklu i\u015f par\u00e7ac\u0131kl\u0131 ortamlarda g\u00fcvenlik sa\u011flamak i\u00e7in tasarlanm\u0131\u015ft\u0131r.<\/p>\n<p><\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Giri\u015f: Java&#8217;da Listeler Neden \u00d6nemlidir?\nJava&#8217;da veri yap\u0131lar\u0131, programlar\u0131m\u0131z\u0131n veriyi etkin bir \u015fekilde depolamas\u0131 ve i\u015flemesi i\u00e7in tem","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-30612","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-java","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Giri\u015f: Java&#039;da Listeler Neden \u00d6nemlidir? - Kodlar\u0131n Gizemli D\u00fcnyas\u0131<\/title>\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\/giris-javada-listeler-neden-onemlidir\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Giri\u015f: Java&#039;da Listeler Neden \u00d6nemlidir?\" \/>\n<meta property=\"og:description\" content=\"Giri\u015f: Java&#039;da Listeler Neden \u00d6nemlidir? 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