{"id":40142,"date":"2026-02-24T17:40:47","date_gmt":"2026-02-24T14:40:47","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=40142"},"modified":"2026-02-24T17:40:47","modified_gmt":"2026-02-24T14:40:47","slug":"javada-koleksiyonlar-bilmeniz-gereken-her-sey","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javada-koleksiyonlar-bilmeniz-gereken-her-sey\/","title":{"rendered":"Java’da Koleksiyonlar – Bilmeniz Gereken Her \u015eey"},"content":{"rendered":"

<\/p>\n

Java’da Koleksiyonlar – Bilmeniz Gereken Her \u015eey<\/h2>\n

Giri\u015f: Java Koleksiyon \u00c7at\u0131s\u0131n\u0131n \u00d6nemi<\/h3>\n

Java programlama dilinde veri yap\u0131lar\u0131, yaz\u0131l\u0131m geli\u015ftirmenin temel ta\u015flar\u0131ndan biridir. Verileri etkili bir \u015fekilde depolamak, y\u00f6netmek ve i\u015flemek, her uygulaman\u0131n performans\u0131n\u0131 ve s\u00fcrd\u00fcr\u00fclebilirli\u011fini do\u011frudan etkiler. \u0130\u015fte bu noktada Java Koleksiyon \u00c7at\u0131s\u0131 (Java Collections Framework – JCF) devreye girer. JCF, yayg\u0131n olarak kullan\u0131lan veri yap\u0131lar\u0131n\u0131 (listeler, k\u00fcmeler, kuyruklar, haritalar vb.) ve bu yap\u0131lar \u00fczerinde i\u015flem yapmak i\u00e7in standartla\u015ft\u0131r\u0131lm\u0131\u015f bir dizi aray\u00fcz ve s\u0131n\u0131f sunar.<\/p>\n

Java’n\u0131n ilk g\u00fcnlerinden itibaren geli\u015ftiriciler, nesne gruplar\u0131n\u0131 y\u00f6netmek i\u00e7in Array’ler gibi ilkel yap\u0131lar\u0131 kullanm\u0131\u015flard\u0131r. Ancak Array’lerin sabit boyutu, t\u00fcr g\u00fcvenli\u011fi eksikli\u011fi (Java 5’ten \u00f6nceki genel koleksiyonlar i\u00e7in) ve s\u0131n\u0131rl\u0131 i\u015flevselli\u011fi, daha esnek ve g\u00fc\u00e7l\u00fc \u00e7\u00f6z\u00fcmlerin ihtiyac\u0131n\u0131 do\u011furmu\u015ftur. JCF, bu ihtiya\u00e7lara yan\u0131t olarak ortaya \u00e7\u0131km\u0131\u015f ve Java geli\u015ftiricilerinin g\u00fcnl\u00fck i\u015flerinde vazge\u00e7ilmez bir ara\u00e7 haline gelmi\u015ftir. Generic’lerin Java 5 ile tan\u0131t\u0131lmas\u0131yla birlikte, koleksiyonlar t\u00fcr g\u00fcvenli\u011fi ve kod okunabilirli\u011fi a\u00e7\u0131s\u0131ndan devrim niteli\u011finde bir iyile\u015fme ya\u015fam\u0131\u015ft\u0131r.<\/p>\n

Bu makalede, Java Koleksiyon \u00c7at\u0131s\u0131’n\u0131n temel bile\u015fenlerini, her bir aray\u00fcz\u00fcn ve uygulaman\u0131n \u00f6zelliklerini, kullan\u0131m senaryolar\u0131n\u0131, performans farkl\u0131l\u0131klar\u0131n\u0131 ve en iyi uygulamalar\u0131 derinlemesine inceleyece\u011fiz. Amac\u0131m\u0131z, Java’da koleksiyonlar\u0131 etkin bir \u015fekilde kullanmak i\u00e7in gereken t\u00fcm temel ve ileri d\u00fczey bilgileri sunmakt\u0131r.<\/p>\n

Java Koleksiyon \u00c7at\u0131s\u0131na Genel Bak\u0131\u015f<\/h3>\n

Java Koleksiyon \u00c7at\u0131s\u0131, bir dizi aray\u00fcz (interfaces) ve bunlar\u0131n uygulamalar\u0131ndan (implementations) olu\u015fur. Bu yap\u0131, veri depolama ve i\u015fleme i\u00e7in standart bir mimari sa\u011flar. \u00c7er\u00e7evenin temelini olu\u015fturan aray\u00fczler, veri yap\u0131lar\u0131n\u0131n davran\u0131\u015flar\u0131n\u0131 tan\u0131mlarken, uygulamalar bu davran\u0131\u015flar\u0131 somut s\u0131n\u0131flar arac\u0131l\u0131\u011f\u0131yla ger\u00e7ekler.<\/p>\n

JCF’nin ana aray\u00fczleri \u015funlard\u0131r:
\n* Iterable<\/code>: Koleksiyonlar\u0131n \u00fczerinde d\u00f6ng\u00fc yap\u0131labilmesini sa\u011flayan en temel aray\u00fczd\u00fcr.
\n* Collection<\/code>: Tek bir eleman grubunu temsil eden k\u00f6k aray\u00fczd\u00fcr. Listeler, k\u00fcmeler ve kuyruklar bu aray\u00fczden t\u00fcretilir.
\n* List<\/code>: Elemanlar\u0131n s\u0131ral\u0131 bir \u015fekilde depoland\u0131\u011f\u0131 ve tekrar eden elemanlara izin veren koleksiyonlard\u0131r.
\n* Set<\/code>: Elemanlar\u0131n benzersiz oldu\u011fu ve genellikle s\u0131ras\u0131z depoland\u0131\u011f\u0131 koleksiyonlard\u0131r.
\n* Queue<\/code>: Elemanlar\u0131n belirli bir i\u015flem s\u0131ras\u0131na g\u00f6re (genellikle FIFO – First-In, First-Out) i\u015flendi\u011fi koleksiyonlard\u0131r.
\n* Map<\/code>: Anahtar-de\u011fer \u00e7iftleri \u015feklinde veri depolayan koleksiyonlard\u0131r. Collection<\/code> aray\u00fcz\u00fcnden t\u00fcremez, ancak Koleksiyon \u00c7at\u0131s\u0131’n\u0131n ayr\u0131lmaz bir par\u00e7as\u0131d\u0131r.<\/p>\n

Bu aray\u00fczleri anlamak, do\u011fru veri yap\u0131s\u0131n\u0131 se\u00e7mek ve uygulamalar\u0131n\u0131z\u0131 optimize etmek i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n

Temel Aray\u00fczler ve Uygulamalar\u0131<\/h3>\n

Collection Aray\u00fcz\u00fc<\/h4>\n

Collection<\/code> aray\u00fcz\u00fc, JCF’nin temelini olu\u015fturan k\u00f6k aray\u00fczd\u00fcr (Map hari\u00e7). Bir grup nesneyi temsil eder ve bu nesneler \u00fczerinde temel i\u015flemler yapmak i\u00e7in metodlar sunar. Bu metodlar aras\u0131nda add()<\/code>, remove()<\/code>, contains()<\/code>, size()<\/code>, isEmpty()<\/code>, clear()<\/code> ve toArray()<\/code> bulunur. Collection<\/code> aray\u00fcz\u00fc, Iterable<\/code> aray\u00fcz\u00fcn\u00fc geni\u015fletir, bu da t\u00fcm koleksiyonlar\u0131n for-each<\/code> d\u00f6ng\u00fcs\u00fc ile kolayca taranabilece\u011fi anlam\u0131na gelir.<\/p>\n

List Aray\u00fcz\u00fc<\/h4>\n

List<\/code> aray\u00fcz\u00fc, elemanlar\u0131n belirli bir s\u0131rada tutuldu\u011fu ve indeks tabanl\u0131 eri\u015fime izin veren koleksiyonlar\u0131 tan\u0131mlar. Tekrarlayan elemanlara izin verir. List<\/code> aray\u00fcz\u00fc, Collection<\/code> aray\u00fcz\u00fcn\u00fc geni\u015fletir ve ek olarak indeks bazl\u0131 i\u015flemler i\u00e7in get(int index)<\/code>, set(int index, E element)<\/code>, add(int index, E element)<\/code>, remove(int index)<\/code> gibi metodlar sunar.<\/p>\n

ArrayList<\/h5>\n

ArrayList<\/code>, List<\/code> aray\u00fcz\u00fcn\u00fcn en yayg\u0131n kullan\u0131lan uygulamalar\u0131ndan biridir. Dahili olarak dinamik bir dizi (array) kullanarak elemanlar\u0131 depolar.
\n* Avantajlar\u0131:<\/strong> Elemanlara indeks arac\u0131l\u0131\u011f\u0131yla h\u0131zl\u0131 eri\u015fim (O(1)).
\n* Dezavantajlar\u0131:<\/strong> Ortadan veya ba\u015ftan eleman ekleme\/silme i\u015flemleri yava\u015ft\u0131r (O(n)), \u00e7\u00fcnk\u00fc di\u011fer elemanlar\u0131n kayd\u0131r\u0131lmas\u0131 gerekir. Kapasite a\u015f\u0131ld\u0131\u011f\u0131nda dizinin yeniden boyutland\u0131r\u0131lmas\u0131 (yeni ve daha b\u00fcy\u00fck bir dizi olu\u015fturulup eski elemanlar\u0131n kopyalanmas\u0131) maliyetli olabilir.
\n* Kullan\u0131m Senaryolar\u0131:<\/strong> S\u0131k s\u0131k elemanlara indeks ile eri\u015fim gereken durumlarda veya listenin sonuna eklemelerin yo\u011fun oldu\u011fu yerlerde tercih edilir.<\/p>\n

List arrayList = new ArrayList<>();\narrayList.add(\"Elma\");\narrayList.add(\"Armut\");\nSystem.out.println(arrayList.get(0)); \/\/ Elma<\/code><\/pre>\n
LinkedList<\/h5>\n
LinkedList<\/code>, List<\/code> aray\u00fcz\u00fcn\u00fcn bir ba\u015fka pop\u00fcler uygulamas\u0131d\u0131r. Dahili olarak \u00e7ift y\u00f6nl\u00fc ba\u011fl\u0131 liste (doubly linked list) kullanarak elemanlar\u0131 depolar. Her eleman, kendisinden \u00f6nceki ve sonraki eleman\u0131n referans\u0131n\u0131 tutar.
\n*   Avantajlar\u0131:<\/strong> Ortadan veya ba\u015ftan eleman ekleme\/silme i\u015flemleri h\u0131zl\u0131d\u0131r (O(1)), sadece referanslar\u0131n g\u00fcncellenmesi yeterlidir.
\n*   Dezavantajlar\u0131:<\/strong> Elemanlara indeks arac\u0131l\u0131\u011f\u0131yla eri\u015fim yava\u015ft\u0131r (O(n)), \u00e7\u00fcnk\u00fc listenin ba\u015f\u0131ndan veya sonundan ba\u015flayarak ilgili indekse kadar ilerlemek gerekir.
\n*   Kullan\u0131m Senaryolar\u0131:<\/strong> S\u0131k s\u0131k listenin ba\u015f\u0131ndan veya ortas\u0131ndan eleman ekleme\/silme gereken durumlarda tercih edilir. Ayr\u0131ca Queue<\/code> veya Deque<\/code> olarak da kullan\u0131labilir.<\/p>\n
List linkedList = new LinkedList<>();\nlinkedList.add(\"Kedi\");\nlinkedList.add(\"K\u00f6pek\");\nlinkedList.add(0, \"Ku\u015f\"); \/\/ Ba\u015fa ekleme\nSystem.out.println(linkedList); \/\/ [Ku\u015f, Kedi, K\u00f6pek]<\/code><\/pre>\n
Vector (Eski Nesil)<\/h5>\n
Vector<\/code>, ArrayList<\/code>‘e benzer \u015fekilde dinamik bir dizi kullan\u0131r, ancak t\u00fcm metodlar\u0131 senkronizedir (thread-safe). Bu \u00f6zelli\u011fi nedeniyle, \u00e7oklu i\u015f par\u00e7ac\u0131kl\u0131 ortamlarda do\u011frudan kullan\u0131labilir, ancak tek i\u015f par\u00e7ac\u0131kl\u0131 senaryolarda ArrayList<\/code>‘ten daha yava\u015f performans g\u00f6sterir. Genellikle yeni kodlarda ArrayList<\/code> veya java.util.concurrent<\/code> paketindeki e\u015fzamanl\u0131 koleksiyonlar tercih edilir.<\/p>\n
Set Aray\u00fcz\u00fc<\/h4>\n
Set<\/code> aray\u00fcz\u00fc, benzersiz elemanlardan olu\u015fan bir koleksiyonu temsil eder. Yani bir Set<\/code> i\u00e7erisinde ayn\u0131 elemandan birden fazla bulunamaz. Elemanlar\u0131n s\u0131ras\u0131 genellikle garanti edilmez. Set<\/code> aray\u00fcz\u00fc, Collection<\/code> aray\u00fcz\u00fcn\u00fc geni\u015fletir.<\/p>\n
HashSet<\/h5>\n
HashSet<\/code>, Set<\/code> aray\u00fcz\u00fcn\u00fcn en yayg\u0131n uygulamas\u0131d\u0131r. Dahili olarak bir hash tablosu kullan\u0131r.
\n*   Avantajlar\u0131:<\/strong> Eleman ekleme, silme ve kontrol etme i\u015flemleri ortalama olarak \u00e7ok h\u0131zl\u0131d\u0131r (O(1)).
\n*   Dezavantajlar\u0131:<\/strong> Elemanlar\u0131n s\u0131ras\u0131n\u0131 garanti etmez.
\n*   Kullan\u0131m Senaryolar\u0131:<\/strong> Veri tekrar\u0131n\u0131 \u00f6nlemek ve h\u0131zl\u0131 arama, ekleme, silme i\u015flemleri yapmak i\u00e7in idealdir. hashCode()<\/code> ve equals()<\/code> metodlar\u0131n\u0131n do\u011fru implementasyonu, HashSet<\/code>‘in d\u00fczg\u00fcn \u00e7al\u0131\u015fmas\u0131 i\u00e7in hayati \u00f6neme sahiptir.<\/p>\n
Set hashSet = new HashSet<>();\nhashSet.add(\"Java\");\nhashSet.add(\"Python\");\nhashSet.add(\"Java\"); \/\/ Tekrar eden eleman eklenmez\nSystem.out.println(hashSet.size()); \/\/ 2\nSystem.out.println(hashSet.contains(\"Java\")); \/\/ true<\/code><\/pre>\n
LinkedHashSet<\/h5>\n
LinkedHashSet<\/code>, HashSet<\/code>‘in bir alt s\u0131n\u0131f\u0131d\u0131r ve ekleme s\u0131ras\u0131n\u0131 korur. Dahili olarak bir hash tablosu ve \u00e7ift y\u00f6nl\u00fc ba\u011fl\u0131 liste kullan\u0131r.
\n*   Avantajlar\u0131:<\/strong> HashSet<\/code> gibi h\u0131zl\u0131 i\u015flemlere sahiptir ve elemanlar\u0131n eklenme s\u0131ras\u0131n\u0131 korur.
\n*   Dezavantajlar\u0131:<\/strong> HashSet<\/code>‘e g\u00f6re biraz daha fazla bellek t\u00fcketir.
\n*   Kullan\u0131m Senaryolar\u0131:<\/strong> Benzersiz elemanlara ihtiya\u00e7 duyuldu\u011funda ve ayn\u0131 zamanda elemanlar\u0131n eklenme s\u0131ras\u0131n\u0131n \u00f6nemli oldu\u011fu durumlarda kullan\u0131l\u0131r.<\/p>\n
TreeSet<\/h5>\n
TreeSet<\/code>, elemanlar\u0131 do\u011fal s\u0131ralar\u0131na g\u00f6re veya bir Comparator<\/code> taraf\u0131ndan belirtilen s\u0131raya g\u00f6re s\u0131ralanm\u0131\u015f bir \u015fekilde depolar. Dahili olarak bir k\u0131rm\u0131z\u0131-siyah a\u011fa\u00e7 (red-black tree) kullan\u0131r.
\n*   Avantajlar\u0131:<\/strong> Elemanlar her zaman s\u0131ral\u0131 tutulur. first()<\/code>, last()<\/code>, headSet()<\/code>, tailSet()<\/code> gibi s\u0131ral\u0131 koleksiyonlara \u00f6zg\u00fc metodlar sunar.
\n*   Dezavantajlar\u0131:<\/strong> Ekleme, silme ve arama i\u015flemleri HashSet<\/code>‘e g\u00f6re daha yava\u015ft\u0131r (O(log n)).
\n*   Kullan\u0131m Senaryolar\u0131:<\/strong> Elemanlar\u0131n her zaman s\u0131ral\u0131 olmas\u0131n\u0131n gerekti\u011fi durumlarda kullan\u0131l\u0131r. TreeSet<\/code>‘e eklenen nesnelerin Comparable<\/code> aray\u00fcz\u00fcn\u00fc implement etmesi veya TreeSet<\/code> olu\u015fturulurken bir Comparator<\/code> sa\u011flanmas\u0131 gerekir.<\/p>\n
Set treeSet = new TreeSet<>();\ntreeSet.add(5);\ntreeSet.add(1);\ntreeSet.add(3);\nSystem.out.println(treeSet); \/\/ [1, 3, 5]<\/code><\/pre>\n
Queue Aray\u00fcz\u00fc<\/h4>\n
Queue<\/code> aray\u00fcz\u00fc, elemanlar\u0131n belirli bir i\u015flem s\u0131ras\u0131na g\u00f6re (genellikle FIFO – First-In, First-Out) i\u015flendi\u011fi koleksiyonlar\u0131 temsil eder. Kuyruklar genellikle bir i\u015flem hatt\u0131 veya g\u00f6rev y\u00f6neticisi gibi senaryolarda kullan\u0131l\u0131r.<\/p>\n
LinkedList (Queue olarak)<\/h5>\n
LinkedList<\/code>, Queue<\/code> aray\u00fcz\u00fcn\u00fc implement eder ve bu nedenle bir kuyruk olarak kullan\u0131labilir. \u00d6zellikle add()<\/code>\/offer()<\/code> (kuyru\u011fa eleman ekleme), remove()<\/code>\/poll()<\/code> (kuyruktan eleman alma) ve element()<\/code>\/peek()<\/code> (kuyru\u011fun ba\u015f\u0131ndaki elemana bakma) metodlar\u0131 kullan\u0131larak FIFO prensibine uygun davran\u0131r.<\/p>\n
PriorityQueue<\/h5>\n
PriorityQueue<\/code>, elemanlar\u0131 do\u011fal s\u0131ralar\u0131na g\u00f6re veya bir Comparator<\/code> taraf\u0131ndan belirtilen \u00f6ncelik s\u0131ras\u0131na g\u00f6re depolar. En y\u00fcksek \u00f6nceli\u011fe sahip eleman her zaman kuyru\u011fun ba\u015f\u0131nda bulunur.
\n*   Avantajlar\u0131:<\/strong> Elemanlar\u0131 \u00f6ncelik s\u0131ras\u0131na g\u00f6re i\u015fler.
\n*   Dezavantajlar\u0131:<\/strong> Rastgele eri\u015fim desteklemez.
\n*   Kullan\u0131m Senaryolar\u0131:<\/strong> G\u00f6revlerin \u00f6nceli\u011fe g\u00f6re i\u015flenmesi gereken durumlarda (\u00f6rn. i\u015flemci zamanlay\u0131c\u0131lar\u0131, olay sim\u00fclasyonlar\u0131) kullan\u0131l\u0131r.<\/p>\n
Queue priorityQueue = new PriorityQueue<>();\npriorityQueue.offer(\"G\u00f6rev C\");\npriorityQueue.offer(\"G\u00f6rev A\");\npriorityQueue.offer(\"G\u00f6rev B\");\nSystem.out.println(priorityQueue.poll()); \/\/ G\u00f6rev A (alfabetik s\u0131ra)<\/code><\/pre>\n
ArrayDeque<\/h5>\n
ArrayDeque<\/code>, hem Queue<\/code> hem de Deque<\/code> (Double-Ended Queue – \u00c7ift Y\u00f6nl\u00fc Kuyruk) aray\u00fczlerini implement eder. Dinamik bir dizi kullanarak hem ba\u015ftan hem de sondan h\u0131zl\u0131 ekleme ve silme i\u015flemleri sunar.
\n*   Avantajlar\u0131:<\/strong> LinkedList<\/code>‘e g\u00f6re genellikle daha h\u0131zl\u0131d\u0131r ve null<\/code> elemanlara izin vermez.
\n*   Kullan\u0131m Senaryolar\u0131:<\/strong> Hem kuyruk hem de y\u0131\u011f\u0131n (stack) olarak kullan\u0131labilir.<\/p>\n
Map Aray\u00fcz\u00fc<\/h4>\n
Map<\/code> aray\u00fcz\u00fc, anahtar-de\u011fer \u00e7iftleri \u015feklinde veri depolayan bir koleksiyonu temsil eder. Her anahtar benzersizdir ve bir de\u011fere kar\u015f\u0131l\u0131k gelir. Map<\/code> aray\u00fcz\u00fc, Collection<\/code> aray\u00fcz\u00fcnden t\u00fcremez, ancak Koleksiyon \u00c7at\u0131s\u0131’n\u0131n temel bir par\u00e7as\u0131d\u0131r.<\/p>\n
HashMap<\/h5>\n
HashMap<\/code>, Map<\/code> aray\u00fcz\u00fcn\u00fcn en yayg\u0131n kullan\u0131lan uygulamas\u0131d\u0131r. Dahili olarak bir hash tablosu kullan\u0131r.
\n*   Avantajlar\u0131:<\/strong> Anahtarlara g\u00f6re de\u011fer ekleme, alma ve silme i\u015flemleri ortalama olarak \u00e7ok h\u0131zl\u0131d\u0131r (O(1)).
\n*   Dezavantajlar\u0131:<\/strong> Anahtar-de\u011fer \u00e7iftlerinin s\u0131ras\u0131n\u0131 garanti etmez. null<\/code> anahtara ve null<\/code> de\u011ferlere izin verir.
\n*   Kullan\u0131m Senaryolar\u0131:<\/strong> H\u0131zl\u0131 arama ve veri depolama i\u00e7in idealdir. hashCode()<\/code> ve equals()<\/code> metodlar\u0131n\u0131n do\u011fru implementasyonu, HashMap<\/code>‘in d\u00fczg\u00fcn \u00e7al\u0131\u015fmas\u0131 i\u00e7in HashSet<\/code>‘te oldu\u011fu gibi hayati \u00f6neme sahiptir.<\/p>\n
Map hashMap = new HashMap<>();\nhashMap.put(\"Ahmet\", 30);\nhashMap.put(\"Ay\u015fe\", 25);\nSystem.out.println(hashMap.get(\"Ahmet\")); \/\/ 30\nSystem.out.println(hashMap.containsKey(\"Ay\u015fe\")); \/\/ true<\/code><\/pre>\n
LinkedHashMap<\/h5>\n
LinkedHashMap<\/code>, HashMap<\/code>‘in bir alt s\u0131n\u0131f\u0131d\u0131r ve anahtar-de\u011fer \u00e7iftlerinin eklenme s\u0131ras\u0131n\u0131 (insertion order) veya eri\u015fim s\u0131ras\u0131n\u0131 (access order) korur. Dahili olarak bir hash tablosu ve \u00e7ift y\u00f6nl\u00fc ba\u011fl\u0131 liste kullan\u0131r.
\n*   Avantajlar\u0131:<\/strong> HashMap<\/code> gibi h\u0131zl\u0131 i\u015flemlere sahiptir ve anahtar-de\u011fer \u00e7iftlerinin eklenme s\u0131ras\u0131n\u0131 korur.
\n*   Kullan\u0131m Senaryolar\u0131:<\/strong> HashMap<\/code>‘in h\u0131z\u0131na ihtiya\u00e7 duyuldu\u011funda ve ayn\u0131 zamanda anahtar-de\u011fer \u00e7iftlerinin s\u0131ras\u0131n\u0131n \u00f6nemli oldu\u011fu durumlarda kullan\u0131l\u0131r (\u00f6rn. LRU cache implementasyonu).<\/p>\n
TreeMap<\/h5>\n
TreeMap<\/code>, anahtarlar\u0131 do\u011fal s\u0131ralar\u0131na g\u00f6re veya bir Comparator<\/code> taraf\u0131ndan belirtilen s\u0131raya g\u00f6re s\u0131ralanm\u0131\u015f bir \u015fekilde depolar. Dahili olarak bir k\u0131rm\u0131z\u0131-siyah a\u011fa\u00e7 (red-black tree) kullan\u0131r.
\n*   Avantajlar\u0131:<\/strong> Anahtarlar her zaman s\u0131ral\u0131 tutulur. S\u0131ral\u0131 koleksiyonlara \u00f6zg\u00fc metodlar sunar.
\n*   Dezavantajlar\u0131:<\/strong> Ekleme, silme ve arama i\u015flemleri HashMap<\/code>‘e g\u00f6re daha yava\u015ft\u0131r (O(log n)).
\n*   Kullan\u0131m Senaryolar\u0131:<\/strong> Anahtarlar\u0131n her zaman s\u0131ral\u0131 olmas\u0131n\u0131n gerekti\u011fi durumlarda kullan\u0131l\u0131r. TreeMap<\/code>‘e eklenen anahtarlar\u0131n Comparable<\/code> aray\u00fcz\u00fcn\u00fc implement etmesi veya TreeMap<\/code> olu\u015fturulurken bir Comparator<\/code> sa\u011flanmas\u0131 gerekir.<\/p>\n
Hashtable (Eski Nesil)<\/h5>\n
Hashtable<\/code>, HashMap<\/code>‘e benzer, ancak t\u00fcm metodlar\u0131 senkronizedir (thread-safe) ve null<\/code> anahtarlara veya de\u011ferlere izin vermez. Vector<\/code> gibi, senkronize olmas\u0131 nedeniyle tek i\u015f par\u00e7ac\u0131kl\u0131 senaryolarda HashMap<\/code>‘ten daha yava\u015ft\u0131r. Yeni kodlarda ConcurrentHashMap<\/code> veya HashMap<\/code> tercih edilir.<\/p>\n
Yard\u0131mc\u0131 S\u0131n\u0131flar ve Ara\u00e7lar<\/h3>\n
Collections S\u0131n\u0131f\u0131<\/h4>\n
java.util.Collections<\/code> s\u0131n\u0131f\u0131, koleksiyonlar \u00fczerinde \u00e7e\u015fitli statik yard\u0131mc\u0131 metodlar sa\u011flar. Bu metodlar aras\u0131nda koleksiyonlar\u0131 s\u0131ralama (sort()<\/code>), tersine \u00e7evirme (reverse()<\/code>), kar\u0131\u015ft\u0131rma (shuffle()<\/code>), maksimum\/minimum eleman\u0131 bulma (max()<\/code>, min()<\/code>), senkronize koleksiyonlar olu\u015fturma (synchronizedList()<\/code>, synchronizedSet()<\/code>, synchronizedMap()<\/code>) ve de\u011fi\u015ftirilemez (unmodifiable) koleksiyonlar olu\u015fturma (unmodifiableList()<\/code>, unmodifiableSet()<\/code>, unmodifiableMap()<\/code>) bulunur.<\/p>\n
Arrays S\u0131n\u0131f\u0131<\/h4>\n
java.util.Arrays<\/code> s\u0131n\u0131f\u0131, diziler \u00fczerinde benzer yard\u0131mc\u0131 metodlar sunar. \u00d6zellikle Arrays.asList()<\/code> metodu, bir diziyi List<\/code>‘e d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in kullan\u0131\u015fl\u0131d\u0131r. Ancak bu metodun d\u00f6nd\u00fcrd\u00fc\u011f\u00fc List<\/code> sabit boyutludur ve add()<\/code> veya remove()<\/code> gibi boyutunu de\u011fi\u015ftiren metodlar desteklemez.<\/p>\n
Iterator ve ListIterator<\/h4>\n
Iterator<\/code> aray\u00fcz\u00fc, bir koleksiyonun elemanlar\u0131 \u00fczerinde gezinmek i\u00e7in standart bir yol sa\u011flar. hasNext()<\/code>, next()<\/code> ve remove()<\/code> metodlar\u0131n\u0131 i\u00e7erir. ListIterator<\/code>, List<\/code> aray\u00fcz\u00fcne \u00f6zel bir iterat\u00f6rd\u00fcr; hem ileri hem de geri y\u00f6nde gezinmeye, eleman eklemeye, de\u011fi\u015ftirmeye ve indeks bilgilerine eri\u015fmeye olanak tan\u0131r.<\/p>\n
Generics’in \u00d6nemi<\/h3>\n
Java 5 ile tan\u0131t\u0131lan Generics (Jenerikler), Koleksiyon \u00c7at\u0131s\u0131’n\u0131 d\u00f6n\u00fc\u015ft\u00fcrm\u00fc\u015ft\u00fcr. Generic’ler sayesinde koleksiyonlar, hangi t\u00fcrde elemanlar\u0131 tutacaklar\u0131n\u0131 derleme zaman\u0131nda belirtebilirler.
\n*   T\u00fcr G\u00fcvenli\u011fi:<\/strong> Derleme zaman\u0131nda t\u00fcr kontrol\u00fc sa\u011flayarak \u00e7al\u0131\u015fma zaman\u0131 ClassCastException<\/code> hatalar\u0131n\u0131 \u00f6nler.
\n*   Kod Okunabilirli\u011fi:<\/strong> Hangi t\u00fcrde elemanlar\u0131n beklendi\u011fi a\u00e7\u0131k\u00e7a belirtilir, bu da kodu daha anla\u015f\u0131l\u0131r hale getirir.
\n*   Casting \u0130htiyac\u0131n\u0131n Ortadan Kalkmas\u0131:<\/strong> Elemanlar\u0131 al\u0131rken manuel casting<\/code> yapmaya gerek kalmaz, bu da kodu daha temiz ve g\u00fcvenli yapar.<\/p>\n
\/\/ Generic'siz (eski y\u00f6ntem)\nList list = new ArrayList();\nlist.add(\"String\");\nlist.add(123); \/\/ Derleme hatas\u0131 vermez\nString s = (String) list.get(0);\n\/\/ String s2 = (String) list.get(1); \/\/ \u00c7al\u0131\u015fma zaman\u0131 ClassCastException\n\n\/\/ Generic'li (\u00f6nerilen y\u00f6ntem)\nList stringList = new ArrayList<>();\nstringList.add(\"String\");\n\/\/ stringList.add(123); \/\/ Derleme hatas\u0131 verir\nString s3 = stringList.get(0); \/\/ Casting'e gerek yok<\/code><\/pre>\n
Concurrency ve Thread Safety (E\u015fzamanl\u0131l\u0131k ve \u0130\u015f Par\u00e7ac\u0131\u011f\u0131 G\u00fcvenli\u011fi)<\/h3>\n
Java Koleksiyon \u00c7at\u0131s\u0131’ndaki standart uygulamalar\u0131n \u00e7o\u011fu (\u00f6rn. ArrayList<\/code>, HashMap<\/code>, HashSet<\/code>), varsay\u0131lan olarak i\u015f par\u00e7ac\u0131\u011f\u0131 g\u00fcvenli de\u011fildir. Yani birden fazla i\u015f par\u00e7ac\u0131\u011f\u0131 ayn\u0131 koleksiyona ayn\u0131 anda eri\u015fmeye ve onu de\u011fi\u015ftirmeye \u00e7al\u0131\u015ft\u0131\u011f\u0131nda beklenmedik sonu\u00e7lar (data corruption, infinite loops vb.) ortaya \u00e7\u0131kabilir.<\/p>\n
Senkronize Koleksiyonlar<\/h4>\n
Collections<\/code> s\u0131n\u0131f\u0131, mevcut koleksiyonlar\u0131 i\u015f par\u00e7ac\u0131\u011f\u0131 g\u00fcvenli hale getirmek i\u00e7in senkronize sar\u0131c\u0131 metodlar sunar: Collections.synchronizedList()<\/code>, synchronizedSet()<\/code>, synchronizedMap()<\/code>. Bu metodlar, temel koleksiyonu bir kilit mekanizmas\u0131yla sararak her eri\u015fimde senkronizasyon sa\u011flar.
\n*   Avantajlar\u0131:<\/strong> Mevcut koleksiyonlar\u0131 kolayca thread-safe hale getirir.
\n*   Dezavantajlar\u0131:<\/strong> T\u00fcm metod \u00e7a\u011fr\u0131lar\u0131 \u00fczerinde global bir kilit kulland\u0131\u011f\u0131 i\u00e7in performans darbo\u011fazlar\u0131na neden olabilir, \u00f6zellikle y\u00fcksek e\u015fzamanl\u0131l\u0131k durumlar\u0131nda \u00f6l\u00e7eklenemez.<\/p>\n
java.util.concurrent Paketi<\/h4>\n
Java 5 ile tan\u0131t\u0131lan java.util.concurrent<\/code> paketi, y\u00fcksek performansl\u0131 ve \u00f6l\u00e7eklenebilir e\u015fzamanl\u0131 koleksiyonlar sunar. Bu koleksiyonlar, genellikle daha ince taneli kilit mekanizmalar\u0131 (fine-grained locking) veya kilitsiz (lock-free) algoritmalar kullanarak synchronized<\/code> sar\u0131c\u0131lardan daha iyi performans g\u00f6sterir.<\/p>\n
*   ConcurrentHashMap:<\/strong> HashMap<\/code>‘in e\u015fzamanl\u0131 versiyonudur. T\u00fcm haritay\u0131 kilitlemek yerine, veriyi segmentlere ay\u0131r\u0131r ve her segmenti ayr\u0131 ayr\u0131 kilitler. Bu, birden fazla i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131n ayn\u0131 anda farkl\u0131 segmentlere eri\u015fmesine izin vererek performans\u0131 art\u0131r\u0131r.
\n*   CopyOnWriteArrayList \/ CopyOnWriteArraySet:<\/strong> Bu koleksiyonlar, bir de\u011fi\u015fiklik (ekleme, silme) oldu\u011funda temel dizinin bir kopyas\u0131n\u0131 olu\u015fturur. Okuma i\u015flemleri i\u00e7in kilit gerekmez, bu da okuma a\u011f\u0131rl\u0131kl\u0131 senaryolarda y\u00fcksek e\u015fzamanl\u0131l\u0131k sa\u011flar. Ancak yazma i\u015flemleri maliyetlidir ve koleksiyon boyutu b\u00fcy\u00fcd\u00fck\u00e7e performans d\u00fc\u015fer.
\n*   BlockingQueue (\u00f6rn. ArrayBlockingQueue, LinkedBlockingQueue):<\/strong> \u0130\u015f par\u00e7ac\u0131klar\u0131 aras\u0131nda veri al\u0131\u015fveri\u015fi i\u00e7in kullan\u0131lan kuyruklard\u0131r. Kuyruk bo\u015fsa take()<\/code> metodu, kuyruk doluysa put()<\/code> metodu i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 bloke eder (bekletir), bu da \u00fcretici-t\u00fcketici desenleri i\u00e7in idealdir.<\/p>\n
E\u015fzamanl\u0131 uygulamalarda, genellikle Collections.synchronizedXxx()<\/code> metodlar\u0131 yerine java.util.concurrent<\/code> paketindeki koleksiyonlar\u0131n kullan\u0131lmas\u0131 \u00f6nerilir, \u00e7\u00fcnk\u00fc bunlar daha iyi performans ve \u00f6l\u00e7eklenebilirlik sunar.<\/p>\n
En \u0130yi Uygulamalar ve \u0130pu\u00e7lar\u0131<\/h3>\n
Aray\u00fczleri Kullan\u0131n, Uygulamalar\u0131 De\u011fil<\/h4>\n
Koleksiyonlar\u0131 bildirirken her zaman aray\u00fcz t\u00fcr\u00fcn\u00fc kullan\u0131n (\u00f6rn. List myList = new ArrayList<>();<\/code> yerine ArrayList myList = new ArrayList<>();<\/code>). Bu, kodunuzu daha esnek hale getirir. Gelecekte uygulamas\u0131n\u0131 de\u011fi\u015ftirmek istedi\u011finizde (\u00f6rn. ArrayList<\/code>‘ten LinkedList<\/code>‘e), sadece nesneyi olu\u015fturdu\u011funuz sat\u0131r\u0131 de\u011fi\u015ftirmeniz yeterli olur, geri kalan kod etkilenmez.<\/p>\n
Do\u011fru Koleksiyonu Se\u00e7in<\/h4>\n
Uygulaman\u0131z\u0131n gereksinimlerine g\u00f6re do\u011fru koleksiyonu se\u00e7mek performans\u0131 b\u00fcy\u00fck \u00f6l\u00e7\u00fcde etkiler:
\n*   S\u0131ral\u0131 ve tekrar eden elemanlar:<\/strong> ArrayList<\/code> (h\u0131zl\u0131 eri\u015fim) veya LinkedList<\/code> (h\u0131zl\u0131 ekleme\/silme).
\n*   Benzersiz elemanlar:<\/strong> HashSet<\/code> (h\u0131zl\u0131 i\u015flem) veya TreeSet<\/code> (s\u0131ral\u0131).
\n*   Anahtar-de\u011fer \u00e7iftleri:<\/strong> HashMap<\/code> (h\u0131zl\u0131 i\u015flem) veya TreeMap<\/code> (s\u0131ral\u0131 anahtarlar).
\n*   FIFO davran\u0131\u015f\u0131:<\/strong> LinkedList<\/code> (Queue olarak) veya ArrayDeque<\/code>.
\n*   \u00d6ncelikli i\u015flem:<\/strong> PriorityQueue<\/code>.
\n*   E\u015fzamanl\u0131l\u0131k:<\/strong> ConcurrentHashMap<\/code>, CopyOnWriteArrayList<\/code>, BlockingQueue<\/code>.<\/p>\n
hashCode() ve equals() Metodlar\u0131n\u0131n Do\u011fru Implementasyonu<\/h4>\n
HashSet<\/code>, HashMap<\/code> ve LinkedHashSet<\/code> gibi hash tabanl\u0131 koleksiyonlar kullan\u0131rken, \u00f6zel nesnelerinizin hashCode()<\/code> ve equals()<\/code> metodlar\u0131n\u0131 do\u011fru bir \u015fekilde override etmesi kritik \u00f6neme sahiptir. Yanl\u0131\u015f implementasyonlar, koleksiyonlar\u0131n elemanlar\u0131 yanl\u0131\u015f bir \u015fekilde depolamas\u0131na, arama yapamamas\u0131na veya tekrar eden elemanlara izin vermesine neden olabilir.<\/p>\n
Performans \u0130pu\u00e7lar\u0131: Ba\u015flang\u0131\u00e7 Kapasitesi<\/h4>\n
ArrayList<\/code> ve HashMap<\/code> gibi koleksiyonlar i\u00e7in, ba\u015flang\u0131\u00e7 kapasitesini (initial capacity) tahmin edebiliyorsan\u0131z belirtmek performans\u0131 art\u0131rabilir. Bu, koleksiyonun s\u0131k s\u0131k yeniden boyutland\u0131r\u0131lmas\u0131n\u0131 ve maliyetli eleman kopyalama i\u015flemlerini \u00f6nler.<\/p>\n
\/\/ 100 eleman i\u00e7erece\u011fi tahmin ediliyorsa\nList list = new ArrayList<>(100);\nMap map = new HashMap<>(100);<\/code><\/pre>\n
De\u011fi\u015ftirilemez (Immutable) Koleksiyonlar (Java 9+)<\/h4>\n
Java 9 ve sonraki s\u00fcr\u00fcmler, List.of()<\/code>, Set.of()<\/code> ve Map.of()<\/code> gibi fabrika metodlar\u0131 arac\u0131l\u0131\u011f\u0131yla kolayca de\u011fi\u015ftirilemez koleksiyonlar olu\u015fturma imkan\u0131 sunar. Bu koleksiyonlar olu\u015fturulduktan sonra elemanlar\u0131 eklenemez, \u00e7\u0131kar\u0131lamaz veya de\u011fi\u015ftirilemez. De\u011fi\u015ftirilemez koleksiyonlar, i\u015f par\u00e7ac\u0131\u011f\u0131 g\u00fcvenli\u011fi sa\u011flar, kodun anla\u015f\u0131l\u0131rl\u0131\u011f\u0131n\u0131 art\u0131r\u0131r ve hatalar\u0131 azalt\u0131r.<\/p>\n
List immutableList = List.of(\"Elma\", \"Armut\", \"Kiraz\");\n\/\/ immutableList.add(\"Muz\"); \/\/ UnsupportedOperationException atar<\/code><\/pre>\n
Stream API ile Koleksiyonlar\u0131 \u0130\u015flemek (Java 8+)<\/h4>\n
Java 8 ile tan\u0131t\u0131lan Stream API, koleksiyonlar \u00fczerinde fonksiyonel programlama tarz\u0131nda g\u00fc\u00e7l\u00fc ve ifade edici i\u015flemler yapmay\u0131 sa\u011flar. Filtreleme, d\u00f6n\u00fc\u015ft\u00fcrme, gruplama gibi karma\u015f\u0131k i\u015flemleri daha okunabilir ve paralel olarak ger\u00e7ekle\u015ftirme yetene\u011fi sunar.<\/p>\n
List numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\nList evenNumbersSquared = numbers.stream()\n                                          .filter(n -> n % 2 == 0) \/\/ \u00c7ift say\u0131lar\u0131 filtrele\n                                          .map(n -> n * n)         \/\/ Karelerini al\n                                          .collect(Collectors.toList()); \/\/ Yeni bir Listeye topla\nSystem.out.println(evenNumbersSquared); \/\/ [4, 16, 36, 64, 100]<\/code><\/pre>\n
Sonu\u00e7<\/h3>\n
Java Koleksiyon \u00c7at\u0131s\u0131, Java programlama dilinin en g\u00fc\u00e7l\u00fc ve en s\u0131k kullan\u0131lan \u00f6zelliklerinden biridir. Sa\u011flad\u0131\u011f\u0131 zengin aray\u00fcz ve uygulama seti sayesinde geli\u015ftiriciler, \u00e7e\u015fitli veri y\u00f6netimi ihtiya\u00e7lar\u0131 i\u00e7in sa\u011flam ve performansl\u0131 \u00e7\u00f6z\u00fcmler \u00fcretebilirler. List<\/code>, Set<\/code>, Queue<\/code> ve Map<\/code> gibi temel aray\u00fczleri, bunlar\u0131n ArrayList<\/code>, LinkedList<\/code>, HashSet<\/code>, TreeSet<\/code>, HashMap<\/code>, TreeMap<\/code> gibi pop\u00fcler uygulamalar\u0131n\u0131 ve her birinin kendine \u00f6zg\u00fc avantaj ve dezavantajlar\u0131n\u0131 anlamak, etkili Java kodu yazman\u0131n anahtar\u0131d\u0131r.<\/p>\n
Generics’in sa\u011flad\u0131\u011f\u0131 t\u00fcr g\u00fcvenli\u011fi, java.util.concurrent<\/code> paketinin sundu\u011fu e\u015fzamanl\u0131l\u0131k \u00e7\u00f6z\u00fcmleri ve Collections<\/code> s\u0131n\u0131f\u0131n\u0131n yard\u0131mc\u0131 metodlar\u0131, Koleksiyon \u00c7at\u0131s\u0131’n\u0131 daha da g\u00fc\u00e7l\u00fc k\u0131lar. Ayr\u0131ca, Java 8 ile gelen Stream API ve Java 9 ile tan\u0131t\u0131lan de\u011fi\u015ftirilemez koleksiyonlar gibi modern \u00f6zellikler, koleksiyonlarla \u00e7al\u0131\u015fmay\u0131 daha verimli ve keyifli hale getirmi\u015ftir.<\/p>\n
Do\u011fru koleksiyonu se\u00e7mek, hashCode()<\/code> ve equals()<\/code> metodlar\u0131n\u0131 do\u011fru implemente etmek, aray\u00fczleri kullanmak ve e\u015fzamanl\u0131l\u0131k gerektiren durumlarda uygun concurrent<\/code> koleksiyonlar\u0131 tercih etmek, Java geli\u015ftiricisi olarak bilmeniz gereken “olmazsa olmaz” bilgilerdir. Bu bilgilerle donanm\u0131\u015f olarak, daha sa\u011flam, performansl\u0131 ve s\u00fcrd\u00fcr\u00fclebilir Java uygulamalar\u0131 geli\u015ftirebilirsiniz.<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Java’da Koleksiyonlar – Bilmeniz Gereken Her \u015eey\nGiri\u015f: Java Koleksiyon \u00c7at\u0131s\u0131n\u0131n \u00d6nemi\nJava programlama dilinde veri yap\u0131lar\u0131, yaz\u0131l\u0131m ge","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-40142","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 Koleksiyonlar - Bilmeniz Gereken Her \u015eey - 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\/javada-koleksiyonlar-bilmeniz-gereken-her-sey\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java'da Koleksiyonlar - 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