JAVA EĞİTİMİ

Java Eğitimi Konuları

1. Java Felsefesi ve JVM Ekosistemi

• "Write once, run anywhere" prensibi ve sürüm akışı
• OpenJDK, Oracle JDK, Amazon Corretto, Eclipse Temurin
• LTS sürümleri ve sürüm tercih stratejisi
• JVM ekosistem dilleri: Kotlin, Scala, Groovy, Clojure

2. Söz Dizimi ve Primitive Tipler

• Primitive tipler: byte, short, int, long, float, double, char, boolean
• Autoboxing ve Integer cache (-128 ila 127)
• var ile local type inference
• Text block (""") ve multiline string
• Operator önceliği ve sequence point

3. String Manipülasyonu ve StringBuilder

• String immutability ve string pool
• StringBuilder vs StringBuffer thread safety
• String.format ve printf
• String.join, String.repeat modern API
• Locale ve internationalization

4. Akış Kontrolü ve Switch Expressions

• if-else, classic switch statement
• Switch expression ve arrow syntax
• Pattern matching for switch
• for-each ve enhanced for loop
• break, continue, labeled loop

5. OOP - Class, Object, Encapsulation

• Class, constructor, this keyword
• Access modifier: public, protected, package, private
• Getter/setter ve encapsulation
• static keyword: field, method, block, nested class
• Object class metotları: equals, hashCode, toString

6. Inheritance, Polymorphism, Abstract Class

• extends ile inheritance
• super keyword ve constructor chain
• Method overriding ve @Override annotation
• Abstract class ve abstract method
• final class ve method ile inheritance kapatma

7. Interface ve Default Method

• Interface ile multiple inheritance benzeri
• Default method ve diamond problem çözümü
• Static method ve private method interface'te
• Functional interface ve @FunctionalInterface
• Sealed interface ile sınırlı hiyerarşi

8. Collections Framework

• List: ArrayList, LinkedList, Vector
• Set: HashSet, TreeSet, LinkedHashSet
• Map: HashMap, TreeMap, ConcurrentHashMap
• Queue ve Deque: PriorityQueue, ArrayDeque
• Iterator, fail-fast vs fail-safe
• Collections utility class ve immutable factory

9. Generics ve Type Erasure

• Generic class, method, interface
• Wildcard: ?, extends, super (PECS prensibi)
• Bounded type parameter
• Type erasure ve runtime sınırlamaları
• Heap pollution ve @SafeVarargs

10. Functional Interface ve Lambda

• Lambda expression syntax
• Built-in functional interface: Function, Predicate, Consumer, Supplier
• Method reference (::) ve constructor reference
• Capture variable ve effectively final

11. Stream API - map, filter, reduce

• Stream, Collection ile farkı
• Intermediate vs terminal operation
• map, filter, flatMap, reduce
• Collectors: toList, toMap, groupingBy, partitioningBy
• Parallel stream ve ForkJoinPool

12. Optional - Null Safety

• Optional.of, ofNullable, empty
• orElse, orElseGet, orElseThrow farkı
• map, flatMap, filter Optional ile
• Optional anti-pattern: field tipi olarak kullanma

13. Exception Handling - Checked, Unchecked ve try-with-resources

• Checked vs unchecked exception
• try-catch-finally ve try-with-resources
• Custom exception sınıfı tasarımı
• Exception chaining: cause ve initCause
• Multi-catch syntax (|)

14. I/O ve NIO.2 (Path, Files)

• Classic I/O: InputStream, OutputStream, Reader, Writer
• NIO.2: Path, Paths, Files
• Files.readAllLines, Files.lines streaming
• WatchService ile dosya değişikliği izleme
• Serializable ve serialization riskleri

15. Concurrency - Thread, Runnable

• Thread oluşturma: extends Thread vs implements Runnable
• synchronized keyword ve intrinsic lock
• volatile ve happens-before
• wait, notify, notifyAll low-level senkronizasyon
• java.util.concurrent.atomic paketi

16. ExecutorService ve CompletableFuture

• ExecutorService ve thread pool yönetimi
• Future ile sonuç bekleme
• CompletableFuture ile asenkron zincir
• thenApply, thenCompose, thenCombine
• Exception handling: exceptionally, handle

17. Virtual Threads (Project Loom)

• Platform thread vs virtual thread
• Virtual thread yaşam döngüsü
• Structured concurrency API
• Scoped value (alternative to ThreadLocal)
• Migration: traditional ExecutorService → virtual

18. Memory Model, Happens-Before ve Garbage Collection

• JMM, happens-before ve memory barrier
• Double-checked locking tuzakları
• Immutable object ile thread safety
• Generational GC: Young, Old, Metaspace
• G1, ZGC, Shenandoah karşılaştırması
• GC log analizi ve memory leak tespiti

19. Module System (JPMS)

• module-info.java ve module declaration
• exports, requires, opens
• Modular JDK ve jlink
• Migration: classpath → module path

20. Records, Sealed Classes, Pattern Matching

• Record ile immutable data carrier
• Sealed class ve permits
• Pattern matching for instanceof
• Pattern matching for switch
• Record pattern ve deconstruction

21. Test - JUnit 5 ve AssertJ

• JUnit 5 Jupiter API
• @Test, @BeforeEach, @ParameterizedTest
• AssertJ akıcı assertion
• Mockito ile mock
• Testcontainers ile integration test

22. Build - Maven ve Gradle

• Maven: pom.xml ve standard lifecycle
• Gradle: build.gradle ve task DSL
• Dependency management ve BOM
• Plugin sistemi ve custom task
• Wrapper script (mvnw, gradlew)