☕ Core Java Concepts Learning Repository This repository is a comprehensive collection of hands-on examples and explanations covering all Core Java concepts — from basic syntax and OOP principles to advanced topics like multithreading, exception handling, collections, and file handling. The goal of this repository is to provide clear, practical, and example-driven learning material that helps you build a strong foundation in Java programming and prepare for frameworks like Spring or for technical interviews. 🎯 Objectives Understand Java fundamentals (data types, control structures, operators) Master Object-Oriented Programming (OOP) principles Learn Exception Handling and custom exceptions Work with Collections Framework (List, Set, Map, etc.) Explore File Handling and I/O Streams Understand Multithreading and thread synchronization Learn Interfaces, Abstract Classes, and Inner Classes Understand Packages, Access Modifiers, and Static Members Build small Java programs to reinforce each topic 🧩 Topics Covered # Topic Description 1. Introduction to Java JDK, JRE, JVM, Compilation process 2. Data Types & Variables Primitive types, literals, and memory usage 3. Control Statements if-else, loops, switch, break, continue 4. Arrays & Strings Operations on arrays and string manipulation 5. Object-Oriented Programming (OOP) Classes, objects, methods, encapsulation, inheritance, polymorphism, abstraction 6. Constructors & Static Members Default, parameterized constructors, static methods/variables 7. Interfaces & Abstract Classes Implementing abstraction and multiple inheritance 8. Exception Handling try-catch-finally, throws, throw, custom exceptions 9. Collections Framework ArrayList, HashSet, HashMap, Iterator, Comparator 10. File Handling Reading/Writing files using FileReader, BufferedReader, FileWriter 11. Multithreading Thread class, Runnable interface, synchronization 12. Wrapper Classes & Autoboxing Conversion between primitives and objects 13. Inner & Anonymous Classes Understanding scopes and closures 14. Java 8 Features (Intro) Lambda expressions, functional interfaces, streams