Java Refactoring Catalog

A structured, teaching-oriented catalog of refactoring techniques implemented in Java.

This repository is inspired by Martin Fowler’s Refactoring: Improving the Design of Existing Code (2nd Edition) and reimplements selected refactoring examples in Java.

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📂 Repository Structure

Each refactoring technique follows a consistent structure:

src/
├── main/
│   └── java/
│       └── com/example/
│           └── refactoring_method/
│               ├── before/
│               └── after/
│
└── test/
    └── java/
        └── com/example/
            └── refactoring_method/
                ├── before/
                └── after/

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📘 Covered Refactorings

Examples include (growing over time):

• Extract Function
• Inline Function
• Extract Variable / Introduce Explaining Variable
• Inline Variable / Inline Temp
• Change Function Declaration
• Encapsulate Variable / Self-Encapsulation / Encapsulate Field
• Rename Variable
• Introduce Parameter Object
• Split Phase
• Encapsulate Collection
• Replace Primitive with Object / Replace Data Value with Object / Replace Type Code with Class
• Replace Temp with Query
• Extract Class
• Inline Class
• Hide Delegate
• Remove Middle Man
• Substitute Algorithm
• Move Function
• Move Field
• Move Statement Into Function
• Move Statements to Callers
• Replace Inline Code with Function Call
• Slide Statement formerly Consolidate Duplicate Conditional Fragments
• Split Loop
• Replace Loop With Pipeline

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🚀 Intended Audience

This repository may be useful for:

• Students learning refactoring
• Teaching assistants preparing lab material
• Developers practicing safe code transformation
• Interview preparation for software design discussions

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📚 Reference

Martin Fowler
Refactoring: Improving the Design of Existing Code
Second Edition

This repository is an educational reinterpretation and is not a reproduction of the book.