Java Knowledge Space

A comprehensive, multi-module Maven project serving as a knowledge base for Java programming concepts, best practices, and modern features.

📚 Overview

This repository is organized as a multi-module Maven project, with each module dedicated to a specific area of Java knowledge. Each module contains working code examples, unit tests, and comprehensive documentation.

🏗️ Project Structure

java-knowledge-space/
├── java-basics/           # Fundamental Java concepts
├── java-oop/              # Object-Oriented Programming
├── java-collections/      # Collections Framework
├── java-concurrency/      # Multithreading and Concurrency
├── java-advanced/         # Modern Java features
├── docs/                  # Comprehensive documentation
└── pom.xml                # Parent POM configuration

📖 Modules

1. Java Basics

Fundamental Java concepts including:

• Variables and data types
• Operators and expressions
• Control flow structures
• Arrays and strings
• Basic I/O operations

2. Java OOP

Object-Oriented Programming concepts:

• Classes and objects
• Encapsulation, inheritance, polymorphism, abstraction
• Interfaces and abstract classes
• SOLID principles

3. Java Collections

Java Collections Framework:

• Lists (ArrayList, LinkedList, Vector)
• Sets (HashSet, TreeSet, LinkedHashSet)
• Maps (HashMap, TreeMap, LinkedHashMap)
• Queues and Deques
• Collection utilities

4. Java Concurrency

Multithreading and concurrent programming:

• Thread creation and management
• Synchronization mechanisms
• Executor framework
• Concurrent collections
• Advanced concurrency utilities

5. Java Advanced

Modern Java features:

• Lambda expressions and functional programming
• Stream API
• Optional class
• Date/Time API
• Generics and annotations
• Modern Java features (Records, Sealed classes, etc.)

📘 Documentation

Comprehensive documentation is available in the docs/ directory, organized by topic. Each topic includes:

• Detailed explanations
• Code examples
• Best practices
• Common pitfalls
• Learning resources

🚀 Getting Started

Prerequisites

• Java 17 or higher
• Maven 3.6+

Building the Project

Build all modules:

mvn clean install

Build a specific module:

cd java-basics
mvn clean install

Running Tests

Run tests for all modules:

mvn test

Run tests for a specific module:

cd java-collections
mvn test

🎯 How to Use This Repository

1. Learning: Navigate through modules in order (basics → OOP → collections → concurrency → advanced)
2. Reference: Use the documentation in docs/ for quick reference
3. Practice: Examine and run the example code in each module
4. Testing: Study the test cases to understand usage patterns

🤝 Contributing

Contributions are welcome! Here's how you can help:

1. Add new examples to existing modules
2. Improve documentation
3. Add test cases
4. Fix bugs or improve code quality
5. Suggest new topics or modules

Contribution Guidelines

• Follow the existing code structure
• Include tests for new code
• Update documentation accordingly
• Ensure all tests pass before submitting

📋 Project Requirements

• Java Version: 17+
• Build Tool: Maven
• Testing Framework: JUnit 5

📄 License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

🔗 Resources

• Official Java Documentation
• Java API Specification
• Maven Documentation

📞 Contact

For questions or suggestions, please open an issue in this repository.

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Happy Learning! 🎓