Java Roadmap
Step by step guide to becoming an Android developer.
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1 Learn the Basics
Basic Syntax
Data Types
Variables and Scopes
Conditionals & Loops
Arrays
2 Object Oriented Programming
Classes and Objects
Inheritance
Encapsulation
Abstraction
3 More about OOP
Exception Handling
Interfaces
Lambda Expressions
Enums & Records
Annotations
4 Concurrency
Threads
Java Memory Model
Virtual Threads
5 Collections Framework
List (ArrayList, LinkedList)
Set (HashSet)
Map (HashMap)
Queue & Stack
Generics
6 I/O Operations
File Operations
Networking
7 Functional Programming
Stream API
High Order Functions
Functional Interfaces
Optionals
8 Build Tools
Maven
Gradle
Bazel
9 Web Frameworks
Spring (Spring Boot)
Quarkus
Play Framework
Javalin
10 Database Access
JDBC
Hibernate
Spring Data JPA
EBean
11 Testing
JUnit
Mockito
Integration Testing
Cucumber-JVM
12 Logging Frameworks
SLF4J
Logback / Log4j2
TinyLog