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Syntax, variables, data types, operators, control flow
Classes, objects, inheritance, polymorphism, encapsulation, abstraction
List, Set, Map, Queue, generics, stream API
Threads, runnable, executor, synchronized, locks
Try-catch, custom exceptions, checked vs unchecked
<pre>Java Backend Ecosystem Java Servlets Server-side request/response handling Acts as Backend
Spring Boot, REST APIs, dependency injection, JPA/Hibernate
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Practice interview questions and answers from Basic to Advanced.
Practice section-wise interviews with automatic evaluation.