✅ *Quick Recap of Core Java Concepts* ☕📘 1️⃣ *OOP Principles* - *Encapsulation*: Wrapping data & methods together - *Inheritance*: Reusing code via parent-child classes - *Polymorphism*: Same method, different behavior - *Abstraction*: Hiding internal details using abstract classes/interfaces 2️⃣ *Data Types* - *Primitive*: int, float, boolean, char - *Non-Primitive*: String, Arrays, Objects 3️⃣ *Control Statements* - *if, else, switch* - *for, while, do-while* 4️⃣ *Classes & Objects* - Class is a blueprint - Object is an instance of a class 5️⃣ *Access Modifiers* - *public, private, protected, default* — control visibility 6️⃣ *Exception Handling* - *try, catch, finally, throw, throws* - Checked vs Unchecked exceptions 7️⃣ *Collections Framework* - *List, Set, Map, Queue* - Use *ArrayList*, *HashSet*, *HashMap*, etc. 8️⃣ *Multithreading* - *Thread class & Runnable interface* - *synchronized, wait, notify* 9️⃣ *Java Memory Management* - *Stack & Heap* - *Garbage Collection* 🔟 *Java 8+ Features* - *Lambda Expressions* - *Streams API* - *Optional* - *Default methods in interfaces* 💬 *React ❤️ for more!*