🔥 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
React ♥️ for more
#HappyCoding #coderbaba
follow @coder_baba
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
React ♥️ for more
#HappyCoding #coderbaba
follow @coder_baba
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