Java

Java language fundamentals and advanced concepts commonly tested in interviews.

Topic	Key Focus
Core Java	Data types, String pool, Immutability, Exceptions
Collections Framework	List, Set, Map, Queue implementations & trade-offs
Generics	Type erasure, Bounded types, Wildcards
Streams & Lambdas	Functional interfaces, Stream pipeline, Collectors
Multithreading	ExecutorService, CompletableFuture, Synchronization
JVM Internals	Class loading, JIT compilation, Bytecode
Java Memory Model	Happens-before, Volatile, Memory visibility
Coding Practice — Streams	EPAM-style Stream API coding problems