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Hangisi?",[174,177,180,183],{"key":175,"text":176},"a","start()",{"key":178,"text":179},"b","call()",{"key":181,"text":182},"c","run()",{"key":184,"text":185},"d","execute()","İster Thread'den türetilsin ister Runnable implement edilsin, thread'in işi run() içinde tanımlanır. start() ise yeni bir OS thread'i başlatır ve içeride run()'ı çağırır; 'işi başlatmak' için doğrudan run() çağrılmamalıdır.",{"id":188,"topic":69,"difficulty":189,"body":190,"options":191,"correct_key":175,"explanation":200},"019f6e5f-239c-76a3-999c-3d7996e613f6",2,"```java\nclass DemoThread extends Thread {\n    public void run() {\n        System.out.println(\"run: \" + Thread.currentThread().getName());\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) {\n        DemoThread t = new DemoThread();\n        t.run();\n        System.out.println(\"main: \" + Thread.currentThread().getName());\n    }\n}\n```\nİlk satırda thread adı olarak ne yazdırılır?",[192,194,196,198],{"key":175,"text":193},"main",{"key":178,"text":195},"Yeni bir thread adı, örn. Thread-0",{"key":181,"text":197},"Çalışma zamanında IllegalThreadStateException fırlatır",{"key":184,"text":199},"null, çünkü thread hiç başlatılmadı","t.run() çağrısı doğrudan sıradan bir metot çağrısıdır — yeni bir thread oluşmaz. Bu yüzden run() içindeki Thread.currentThread() hâlâ kendisini çağıran thread'i, yani main'i işaret eder ve 'main' yazdırılır. Sadece t.start() gerçekten yeni bir thread başlatır.",{"id":202,"topic":69,"difficulty":189,"body":203,"options":204,"correct_key":184,"explanation":213},"019f6e5f-23a6-7b25-b979-88ca73c78724","```java\nclass Counter {\n    private int count = 0;\n    public void increment() { count++; }\n    public int get() { return count; }\n}\n\npublic class Main {\n    public static void main(String[] args) throws InterruptedException {\n        Counter counter = new Counter();\n        Runnable task = () -> {\n            for (int i = 0; i \u003C 100_000; i++) counter.increment();\n        };\n        Thread t1 = new Thread(task);\n        Thread t2 = new Thread(task);\n        t1.start(); t2.start();\n        t1.join(); t2.join();\n        System.out.println(counter.get());\n    }\n}\n```\nSonuçta yazdırılan değer için ne söylenebilir?",[205,207,209,211],{"key":175,"text":206},"Her zaman tam olarak 200000 yazdırır, istisnasız",{"key":178,"text":208},"ConcurrentModificationException fırlatır",{"key":181,"text":210},"Her zaman tam olarak 100000 yazdırır, her çalıştırmada",{"key":184,"text":212},"Kesin bir değer garanti edilmez — count++ yarışa girdiği için kayıp güncellemeler yüzünden 200000'den az çıkabilir","count++ atomik olmayan, oku-değiştir-yaz şeklinde birleşik bir işlemdir. İki thread senkronizasyon olmadan eşzamanlı çalıştığında güncellemeler iç içe geçip kaybolabilir; bu yüzden belirli bir sonuç garanti edilmez — kayıp güncellemeler yüzünden 200000'den az çıkabilir.",{"id":215,"topic":69,"difficulty":189,"body":216,"options":217,"correct_key":178,"explanation":226},"019f6e5f-23a8-7e05-a48e-693aed7c00f3","`Callable\u003CV>` ile `Runnable`'ı doğru ayıran ifade hangisidir?",[218,220,222,224],{"key":175,"text":219},"Callable yalnızca Thread ile kullanılabilir, ExecutorService ile asla kullanılamaz",{"key":178,"text":221},"Callable'ın call()'ı değer döndürebilir ve checked exception bildirebilir; run() ikisini de yapamaz",{"key":181,"text":223},"Gerçek bir fark yoktur; ikisi derleyici tarafından birbirinin yerine kullanılır",{"key":184,"text":225},"Runnable, run() ile değer döndürebilir ama Callable asla döndüremez","Callable\u003CV>.call() V tipinde bir değer döndürebilir ve checked exception fırlatabilir. Runnable.run() ise void döner ve checked exception bildiremez. Bu yüzden sonuç veya checked exception iletilmesi gerektiğinde ExecutorService.submit() ile Callable kullanılır.",{"id":228,"topic":69,"difficulty":189,"body":229,"options":230,"correct_key":181,"explanation":239},"019f6e5f-23aa-7138-8b2c-78f721d1425c","```java\npublic class Printer {\n    public synchronized void printTicket(int id) {\n        System.out.print(\"[\" + id);\n        System.out.println(\"]\");\n    }\n}\n```\nİki thread, AYNI Printer nesnesi üzerinde farklı id'lerle sürekli printTicket() çağırıyor. synchronized burada neyi garanti eder?",[231,233,235,237],{"key":175,"text":232},"İki thread daha yüksek verim için printTicket()'ı gerçekten paralel çalıştırır",{"key":178,"text":234},"Değiştirilen alan ayrıca volatile olarak işaretlenmedikçe hiçbir etkisi yoktur",{"key":181,"text":236},"Her printTicket() çağrısı, başka thread girmeden önce tek bir birim olarak biter",{"key":184,"text":238},"id'lerin kesinlikle artan sayısal sırayla yazdırılacağını garanti eder","synchronized bir instance metodu, çalışmadan önce `this` nesnesinin monitörünü alır ve çıkışta serbest bırakır; bu yüzden aynı nesne üzerindeki eşzamanlı çağrılar sıralı hale gelir — biri tamamen bitmeden diğeri başlamaz. id sırası veya paralellik hakkında bir garanti vermez.",{"id":241,"topic":69,"difficulty":171,"body":242,"options":243,"correct_key":184,"explanation":252},"019f6e5f-23ac-700c-ac23-96aef19c5c2b","```java\nExecutorService pool = Executors.newFixedThreadPool(2);\npool.submit(() -> System.out.println(\"task 1\"));\npool.submit(() -> System.out.println(\"task 2\"));\npool.shutdown();\n```\n`pool.shutdown()` burada ne yapar?",[244,246,248,250],{"key":175,"text":245},"Çalışmakta olan iki görevi hemen ve zorla sonlandırır",{"key":178,"text":247},"JVM'in kendisi sonlanana kadar çağıran thread'i süresiz bloklar",{"key":181,"text":249},"İki görevi hiç çalıştırmadan sessizce havuzdan kaldırır",{"key":184,"text":251},"Yeni görev gönderimlerini reddeder ama zaten gönderilmiş görevlerin bitmesine izin verir","ExecutorService.shutdown() düzenli bir kapatma başlatır: önceden gönderilen görevler çalıştırılır ama yeni görev kabul edilmez. Çalışan görevleri kesmez ve çağıran thread'i bloklamaz.",{"fields":254,"seniorities":424,"interview_shapes":425,"locales":430,"oauth":432,"question_count":435,"coach_enabled":436,"jd_match_enabled":436},[255,266,286,303,327,340,359,378,398,405,411,418],{"key":5,"name_tr":6,"name_en":6,"sort":171,"specializations":256},[257,260,261,262,263,264,265],{"key":258,"name":259,"field":5},"general","Genel",{"key":156,"name":157,"field":5},{"key":166,"name":167,"field":5},{"key":8,"name":9,"field":5},{"key":153,"name":154,"field":5},{"key":160,"name":161,"field":5},{"key":163,"name":164,"field":5},{"key":267,"name_tr":268,"name_en":268,"sort":189,"specializations":269},"frontend","Frontend",[270,271,274,277,280,283],{"key":258,"name":259,"field":267},{"key":272,"name":273,"field":267},"javascript","JavaScript",{"key":275,"name":276,"field":267},"typescript","TypeScript",{"key":278,"name":279,"field":267},"react","React",{"key":281,"name":282,"field":267},"vue","Vue",{"key":284,"name":285,"field":267},"angular","Angular",{"key":287,"name_tr":288,"name_en":288,"sort":289,"specializations":290},"fullstack","Fullstack",3,[291,292,293,294,295,296,297,298,299,300,301,302],{"key":258,"name":259,"field":287},{"key":156,"name":157,"field":5},{"key":166,"name":167,"field":5},{"key":8,"name":9,"field":5},{"key":153,"name":154,"field":5},{"key":160,"name":161,"field":5},{"key":163,"name":164,"field":5},{"key":272,"name":273,"field":267},{"key":275,"name":276,"field":267},{"key":278,"name":279,"field":267},{"key":281,"name":282,"field":267},{"key":284,"name":285,"field":267},{"key":304,"name_tr":305,"name_en":305,"sort":306,"specializations":307},"devops-cloud","DevOps \u002F Cloud",4,[308,309,312,315,318,321,324],{"key":258,"name":259,"field":304},{"key":310,"name":311,"field":304},"aws","AWS",{"key":313,"name":314,"field":304},"gcp","GCP",{"key":316,"name":317,"field":304},"azure","Azure",{"key":319,"name":320,"field":304},"kubernetes","Kubernetes",{"key":322,"name":323,"field":304},"terraform","Terraform",{"key":325,"name":326,"field":304},"linux","Linux",{"key":328,"name_tr":329,"name_en":329,"sort":330,"specializations":331},"ai-engineer","AI Engineer",5,[332,333,334,337],{"key":258,"name":259,"field":328},{"key":166,"name":167,"field":328},{"key":335,"name":336,"field":328},"llm-rag","LLM\u002FRAG",{"key":338,"name":339,"field":328},"mlops","MLOps",{"key":341,"name_tr":342,"name_en":343,"sort":344,"specializations":345},"database","Veritabanı","Database",6,[346,347,350,353,356],{"key":258,"name":259,"field":341},{"key":348,"name":349,"field":341},"postgresql","PostgreSQL",{"key":351,"name":352,"field":341},"mysql","MySQL",{"key":354,"name":355,"field":341},"mongodb","MongoDB",{"key":357,"name":358,"field":341},"redis","Redis",{"key":360,"name_tr":361,"name_en":362,"sort":363,"specializations":364},"mobile","Mobil","Mobile",7,[365,366,369,372,375],{"key":258,"name":259,"field":360},{"key":367,"name":368,"field":360},"ios-swift","iOS (Swift)",{"key":370,"name":371,"field":360},"android-kotlin","Android (Kotlin)",{"key":373,"name":374,"field":360},"flutter","Flutter",{"key":376,"name":377,"field":360},"react-native","React Native",{"key":146,"name_tr":147,"name_en":379,"sort":380,"specializations":381},"Security",8,[382,383,386,389,392,395],{"key":258,"name":259,"field":146},{"key":384,"name":385,"field":146},"appsec","AppSec",{"key":387,"name":388,"field":146},"offensive-pentest","Offensive \u002F Pentest",{"key":390,"name":391,"field":146},"cloud-security","Cloud Security",{"key":393,"name":394,"field":146},"devsecops","DevSecOps",{"key":396,"name":397,"field":146},"blue-team-incident","Blue Team \u002F Incident",{"key":399,"name_tr":400,"name_en":401,"sort":402,"specializations":403},"qa-test-automation","QA \u002F Test Otomasyonu","QA \u002F Test Automation",9,[404],{"key":258,"name":259,"field":399},{"key":406,"name_tr":407,"name_en":407,"sort":408,"specializations":409},"data-engineer","Data Engineer",10,[410],{"key":258,"name":259,"field":406},{"key":412,"name_tr":413,"name_en":414,"sort":415,"specializations":416},"game-dev","Oyun Geliştirme","Game Development",11,[417],{"key":258,"name":259,"field":412},{"key":419,"name_tr":420,"name_en":420,"sort":421,"specializations":422},"ml-engineer","ML Engineer",12,[423],{"key":258,"name":259,"field":419},[14,15,16],{"junior":426,"mid":428,"senior":429},{"questions":427,"median_sec":3},20,{"questions":427,"median_sec":3},{"questions":427,"median_sec":3},[10,431],"en",[433,434],"google","github",21750,true]