Welcome to Java Mastery, a curated collection of hands-on Java examples designed to build a deep, practical understanding of core and advanced Java concepts.

This repository focuses on how Java actually works—from language features to build tooling—through runnable code and clear explanations.

Each topic includes:

• 📄 Well-documented Java code examples
• 📘 Markdown files explaining concepts and decisions
• 🖥️ Output screenshots or logs (where relevant)

• How to Run Examples
• Topics Covered
  • Exception Handling
  • Generics
  • Java 21 – Record Patterns
  • Java 21 – Sequenced Collections
  • Streams API
  • JAR Files (Thin vs Fat)
• Upcoming Topics
• Motivation
• License

• Java Version: 21
• Build Tools:
  • javac / java for standalone, language-focused examples
  • Maven for topics involving build tooling (e.g., JAR packaging)

Each folder is self-contained.
Instructions or assumptions specific to a topic are documented inside that folder.

• try-catch, multi-catch, finally
• Try-with-resources
• Custom and chained exceptions
• Common pitfalls and best practices

• Type safety and invariance
• Generic classes and methods
• Wildcards (? extends, ? super)
• Type erasure and its implications

• Deconstructing immutable data
• Pattern matching in switch and if
• Cleaner, safer data access with records

• Ordered access to first/last elements
• New APIs for lists, sets, and maps

• Intermediate vs terminal operations

• What a JAR really is
• Thin JAR vs Fat (Uber) JAR
• Real troubleshooting from local builds

Planned additions with runnable examples and documentation:

• EAR and WAR

This repository documents my journey toward true Java mastery; not just using APIs, but understanding the runtime, tooling, and design trade-offs behind them.

The goal is clarity over abstraction, correctness over shortcuts, and learning by doing.

This project is licensed under the MIT License.