Core Java Interview

Core Java is one of the most important areas in Java developer interviews. This section covers topics such as OOP, collections, HashMap internals, equals and hashCode, exceptions, generics, immutability, multithreading, concurrency, streams, JVM, memory management, garbage collection, and modern Java features. The questions range from basic concepts to deeper scenarios expected from experienced developers. Wherever possible, concepts are explained with practical examples and common interview follow-up questions. The goal is to help you understand Java deeply rather than simply memorize answers.