Devesh Punjabi on Instagram: "🚀 Java Roadmap — Zero to Advanced 💻✨ Start from scratch and level up step by step: 1️⃣ Basics → Syntax, Data Types, Loops, Arrays 2️⃣ OOP → Classes, Inheritance, Polymorphism, Abstraction 3️⃣ Collections → List, Set, Map, Generics, Iterators 4️⃣ Exception Handling → try-catch, throw/throws, custom exceptions 5️⃣ File I/O → FileReader/Writer, BufferedReader, Serialization 6️⃣ Multithreading → Threads, Synchronization, Executors 7️⃣ Java 8+ → Lambda, Streams, Functi