*🚀 Java Core Concepts – From Basic to Advanced:* *🔰 Beginner Level:* 1. *What is Java?* – Platform-independent, OOP-based programming language 2. *Data Types & Variables* – int, float, char, boolean 3. *Operators* – Arithmetic, Relational, Logical 4. *Control Flow* – if-else, switch, for, while, do-while 5. *Input/Output* – Scanner, System.out 6. *Methods* – Declaration, Parameters, Return types 7. *Arrays* – Single & multidimensional arrays 8. *String Handling* – String class, concatenation, methods *💡 Intermediate Level:* 9. *OOP Concepts* – Inheritance, Polymorphism, Encapsulation, Abstraction 10. *Constructors* – Default & parameterized 11. *Static & Final Keywords* 12. *Access Modifiers* – public, private, protected, default 13. *Exception Handling* – try-catch, throw, throws, finally 14. *Interfaces & Abstract Classes* 15. *Packages* – Creating and using custom packages 16. *Wrapper Classes* – Integer, Double, etc. *⚙️ Advanced Level:* 17. *Collections Framework* – List, Set, Map, Queue 18. *Generics* – Type safety and flexibility 19. *Multithreading* – Thread class, Runnable, Synchronization 20. *File Handling* – FileReader, FileWriter, BufferedReader 21. *Java Memory Management* – Stack, Heap, Garbage Collection 22. *Annotations* – Built-in and custom 23. *Lambda Expressions & Streams* – Java 8 functional programming 24. *JVM Architecture* – Classloader, runtime data areas 25. *Reflection API* – Inspect and modify classes at runtime *Double Tap ❤️ if this helped you!*