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A complete India-focused roadmap for becoming a professional Java Developer. Covers core Java, OOP, data structures & algorithms, build tools, web frameworks (Spring), persistence (JPA/Hibernate), testing, concurrency, JVM internals, microservices, cloud deployment, security, performance tuning, certifications, and job preparation. Free-first resources are prioritized; where paid courses are recommended, free alternatives are listed.
Learn programming basics and core Java syntax, OOP, and standard library usage.
Understand variables, control flow (if/for/while), functions/methods, basic problem solving.
Master Java basics: types, control flow, OOP (classes, inheritance, polymorphism, interfaces), exceptions, collections framework, generics.
Learn functional style with streams, lambda expressions, method references, Optional, and the new Date/Time API.
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