*☕ Java Developer Roadmap: From Basics to Advanced* 🟢 *Beginner Level* *1. Java Fundamentals* - Java Syntax & Structure - Data Types, Variables, Operators - Control Statements (if, switch, loops) - Input & Output using Scanner *2. Object-Oriented Programming (OOP)* - Classes & Objects - Constructors - Inheritance, Polymorphism - Encapsulation & Abstraction *3. Basic Java Tools* - Writing & Running Java (IDE: IntelliJ/Eclipse) - JDK, JRE, JVM - Command-line compilation 🟡 *Intermediate Level* *4. Collections Framework* - List, Set, Map, Queue - ArrayList, HashMap, HashSet, LinkedList - Iterators & Enhanced For Loop *5. Exception Handling* - try-catch-finally - throw vs throws - Custom Exceptions *6. File I/O* - Reading & Writing Files using `File`, `Scanner`, `BufferedReader` - FileWriter, BufferedWriter *7. Java 8 Features* - Lambda Expressions - Streams API - Functional Interfaces - Method References *8. Multi-threading Basics* - Threads using `Runnable` & `Thread` - Synchronization - Executors 🔵 *Advanced Level* *9. JDBC & Database* - Connecting to MySQL/PostgreSQL - CRUD Operations - PreparedStatement, ResultSet *10. Design Patterns* - Singleton, Factory, Strategy, Observer - SOLID Principles *11. Unit Testing* - JUnit, TestNG - Mockito for mocking *12. Build Tools* - Maven / Gradle basics - Dependency Management *13. Java Frameworks (Optional for Web Dev)* - Spring Core, Spring Boot - Dependency Injection - REST APIs with Spring *14. Deployment & CI/CD* - Jar & War files - Jenkins, GitHub Actions 🔥 *Pro Tip:* Build mini-projects like banking app, inventory manager, or student portal for practice. *React ❤️ for more!*