abdurrehmanabbasi/java_mastery ? reverse-engineered prompt

Build out this Java learning repo into a complete, beginner friendly masterclass that takes someone from absolute basics to advanced Java.

I want each phase to feel polished and useful, with clear README files, simple explanations, practice questions, and runnable Java examples that actually compile. For phase 1, cover the core basics like syntax, variables, data types, operators, conditionals, loops, arrays, methods, and recursion. For phase 2, focus on OOP, constructors, encapsulation, inheritance, polymorphism, abstraction, interfaces, exceptions, and collections. For phase 3, add more advanced practice with file handling, generics, streams, lambda expressions, multithreading, and JDBC.

Please make the examples easy to follow, add a few small mini projects in each phase, and include helpful learning checklists and common mistakes sections. Keep the tone encouraging and practical, like a real study guide. If anything needs current Java guidance, look up the latest docs online first.