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- Overview
- Java Fundamentals
  
  Code Structure
  Variables
  Data Types
  Operators
  Strings
  User Input
  Conditional Statements
  Arrays
  Loops
  ArrayLists
  HashMaps
  Object-Oriented Programming
  Math Class
  Formatting Numbers
  Interfaces
  Exception Handling
  Abstract Classes
  Inner Classes
  Static Members
  final Keyword
  Singleton Class
  Lambda Expressions
  Method References
  Streams & I/O
- Codecademy
  
  Spring Beans & IoC
  REST Controller Annotations
- Collections
  
  Set
  HashSet
  Map
  Queue
- Persistence
  
  Intro: ORM, JPA & Hibernate
  The Context
  Working with the Context
  Primary Keys
  One-to-One Relationships
  One-to-Many Relationships
  Many-to-Many Relationships
- Reactive (WebFlux)
  
  Intro
  The Need for WebFlux
  WebClient
- Spring Academy
  
  Implementing REST
  Spring Security Fundamentals
  JWT Sign-in & Sign-up
- Spring Start Here
  
  Keywords
  Implementing a Web App with MVC
  The MVC Flow
  Bean Scopes
  Common Annotations
- Spring Fundamentals
  
  Wiring & Dependency Injection
  Bean Scopes
  Transactions
- Spring Security
  
  CORS
  Architecture
  Unit Testing with Mockito
  JWT (Bezkoder-style)
  OAuth2 Authorization Server
  JWT from Scratch
  Setup Checklist
- Testing
  
  Repository Layer
  Service Layer
  Controller Layer
  Integration Tests
- Concurrency
  
  Threads: Introduction
- OO Design Basics
- DTOs, Controllers, Services & Mappers
- Connecting to H2
- Connecting to a Real DB
- Varargs
- Best Practices to Explore
- Aspect-Oriented Programming
- Java: Curated Links
- Overview
- Design Patterns
  
  Catalog
  Observer Pattern
  Factory Method
- Interview Prep
  
  DSA Questions
  Spring Framework Basics
  Java Core Concepts
  Database Design
  Java Backend Guide
  API Design
  Practice Question Bank
- Microservices
  
  Overview
  Design Patterns
  Monitoring & Enablers
- System Design
  
  Problem-Solving Steps
  HTTP & Networking
- Overview
- Designing Data-Intensive Applications
  
  Ch1: Reliable, Scalable & Maintainable
  Ch2: Data Models & Query Languages
  Ch3: Storage & Retrieval
  Ch4: Encoding & Evolution
  Ch5: Replication
  Ch6: Partitioning

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