🔥 Complete Java Roadmap A-Z 🧑‍💻☕️

⿡ Variables & Data Types
↳ int, double, char, boolean, String
↳ float, long, short, byte

⿢ Operators
↳ Arithmetic, Logical, Relational, Bitwise, Assignment, Unary, Ternary

⿣ Control Statements
↳ if, else, else if, switch, case, default
↳ break, continue, return

⿤ Loops
↳ for, while, do-while
↳ for-each loop (array/list iteration)

⿥ Classes & Objects
↳ Class declaration
↳ Objects & object creation using new
↳ Constructors (default + parameterized)

⿦ Methods
↳ Method declaration & overloading
↳ return types, parameters
↳ static vs instance methods

⿧ Access Modifiers
↳ public, private, protected, default (package-private)

⿨ OOP Concepts
↳ Inheritance
↳ Polymorphism (compile/run time)
↳ Abstraction (abstract class + interface)
↳ Encapsulation (getters/setters)

⿩ Arrays & Collections
↳ Single & Multi-dimensional arrays
↳ ArrayList, LinkedList, HashSet, HashMap
↳ Iterators & for-each loops

🔟 Exception Handling
↳ try, catch, finally, throw, throws
↳ Checked vs Unchecked Exceptions
↳ Custom exceptions

⿡⿡ Strings & StringBuilder
↳ String immutability
↳ String methods
↳ Mutable alternatives: StringBuilder, StringBuffer

⿡⿢ Java 8+ Features
↳ Lambda expressions
↳ Streams API
↳ Functional interfaces
↳ Optional
↳ Method references

⿡⿣ File Handling (I/O)
↳ File, FileReader, FileWriter, BufferedReader, BufferedWriter
↳ Scanner
↳ Serialization & Deserialization

⿡⿤ Multithreading
↳ Thread class & Runnable interface
↳ Thread lifecycle
↳ Synchronization
↳ Executors framework

⿡⿥ Inner Classes
↳ Static, non-static, anonymous
↳ Local inner classes

⿡⿦ Enums
↳ Enum declaration and usage
↳ Enum methods and switch cases

⿡⿧ Generics
↳ Generic classes & methods
↳ Bounded types
↳ Wildcards

⿡⿨ JVM, JRE, JDK
↳ Java compilation/execution flow
↳ Memory structure: Heap, Stack
↳ Garbage collection basics

⿡⿩ Annotations
↳ Built-in: @Override, @Deprecated, @SuppressWarnings
↳ Custom annotations

⿢⿠ Reflections API
↳ Inspecting classes, methods, fields at runtime

⿢⿡ Networking
↳ Sockets, ServerSocket, URL & HTTP connections

⿢⿢ Design Patterns
↳ Singleton, Factory, Strategy, Observer, Builder

⿢⿣ Maven/Gradle
↳ Build automation
↳ Dependency management
↳ pom.xml, build.gradle basics

⿢⿤ JUnit & Testing
↳ Unit testing with JUnit
↳ Assertions
↳ Test cases & suites

⿢⿥ Spring Framework (Bonus)
↳ Spring Boot basics
↳ Dependency Injection, REST APIs
↳ Annotations & configurations

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