# iluwatar/java-design-patterns

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93,757 stars · 27,391 forks · Java · other

## Links

- GitHub: https://github.com/iluwatar/java-design-patterns
- Homepage: https://java-design-patterns.com
- awesome-repositories: https://awesome-repositories.com/repository/iluwatar-java-design-patterns.md

## Topics

`awesome-list` `design-patterns` `hacktoberfest` `java` `principles` `snippets` `snippets-collection` `snippets-library`

## Description

This project is a comprehensive educational knowledge base designed to help developers master software engineering excellence through a structured catalog of design patterns and architectural principles. It provides a curated repository of best practices, programming heuristics, and implementation examples, all organized to facilitate skill acquisition and improve code quality in Java.

The repository distinguishes itself by offering a navigable hierarchy of reusable design patterns and architectural strategies that promote interface-centric design and decoupled implementation. By emphasizing clean code standards and established design heuristics, it serves as a reference-based resource for understanding how to build maintainable, modular, and robust object-oriented systems.

Beyond its core architectural focus, the project includes a broad library of functional code snippets and algorithmic implementations. These resources cover a wide range of common programming challenges, including data structures, mathematical computations, file operations, and utility tasks, providing practical, stateless examples that demonstrate idiomatic coding standards.

## Tags

### Education & Learning Resources

- [Code Examples](https://awesome-repositories.com/f/education-learning-resources/educational-resources/reference-and-media/books-docs-reference/code-examples.md) — Demonstrates standard software design patterns through functional, ready-to-use code snippets. ([source](https://java-design-patterns.com/snippets/))
- [Educational Resources](https://awesome-repositories.com/f/education-learning-resources/educational-resources.md) — Organizes complex engineering concepts into a structured hierarchy of reusable architectural principles.
- [Algorithms](https://awesome-repositories.com/f/education-learning-resources/educational-resources/algorithms-theory-academics/cs-theory-foundations/algorithms.md) — Supplies reference implementations and instructional logic for fundamental computational procedures. ([source](https://java-design-patterns.com/snippets/))
- [Architectural Principles](https://awesome-repositories.com/f/education-learning-resources/technical-domain-education/technical-academic-domains/software-engineering-principles/architectural-principles.md) — Provides a structured catalog of patterns for building maintainable and robust object-oriented systems.
- [Search Algorithms](https://awesome-repositories.com/f/education-learning-resources/educational-resources/algorithms-theory-academics/cs-theory-foundations/algorithms/data-ordering-and-retrieval/search-algorithms.md) — Demonstrates standard linear search logic through clear, executable code snippets for educational purposes. ([source](https://java-design-patterns.com/snippets/))
- [Documentation Sites](https://awesome-repositories.com/f/education-learning-resources/educational-resources/reference-and-media/books-docs-reference/documentation/access-discovery-tools/documentation-sites.md) — Serves as a centralized knowledge hub for mastering complex software design concepts.
- [Sorting Algorithms](https://awesome-repositories.com/f/education-learning-resources/technical-domain-education/computer-science-education/computer-science-concepts/sorting-algorithms.md) — Includes clear, instructional examples of common sorting algorithms for educational reference. ([source](https://java-design-patterns.com/snippets/))

### Content Management & Publishing

- [Software Engineering Knowledge Bases](https://awesome-repositories.com/f/content-management-publishing/documentation-knowledge-management/knowledge-bases/technical-reference-systems/software-engineering-knowledge-bases.md) — Catalogs a comprehensive collection of best practices and guidelines to elevate code quality.

### Software Engineering & Architecture

- [Interface-Centric Architectures](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/architectural-patterns/abstraction-domain-modeling/contract-abstraction-patterns/interface-centric-architectures.md) — Illustrates design patterns that leverage abstract contracts to decouple implementation details.
- [YAGNI Principles](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/code-quality-maintenance-philosophies/yagni-principles.md) — Explains development philosophies that prioritize avoiding unnecessary functionality to minimize wasted effort. ([source](https://java-design-patterns.com/principles/))
- [Decoupled Architectures](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/architectural-patterns/modular-decoupled-design/decoupled-architectures.md) — Separates computational logic into independent units to minimize dependencies and improve overall system modularity.
- [Command Query Separation](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/architectural-patterns/modular-decoupled-design/structural-design-paradigms/command-query-separation.md) — Defines architectural structures that strictly separate state-modifying commands from data-returning queries. ([source](https://java-design-patterns.com/principles/))
- [DRY Principles](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/code-quality-maintenance-philosophies/dry-principles.md) — Promotes the principle that every piece of system knowledge should have a single, authoritative representation. ([source](https://java-design-patterns.com/principles/))
- [Maintainability Principles](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/code-quality-maintenance-philosophies/maintainability-principles.md) — Encourages writing clean, intentional code as a primary strategy for reducing long-term maintenance costs and complexity. ([source](https://java-design-patterns.com/principles/))
- [Simplicity Principles](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/code-quality-maintenance-philosophies/simplicity-principles.md) — Encourages design philosophies that focus on the simplest possible solution to solve immediate problems. ([source](https://java-design-patterns.com/principles/))
- [Coupling Management](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/coupling-dependency-management/coupling-management.md) — Teaches architectural practices that reduce mutual interdependence between software modules. ([source](https://java-design-patterns.com/principles/))
- [Inversion of Control](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/coupling-dependency-management/inversion-of-control.md) — Explains the Hollywood Principle where control flow is delegated to external frameworks rather than managed by the application itself. ([source](https://java-design-patterns.com/principles/))
- [Law of Demeter](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/coupling-dependency-management/law-of-demeter.md) — Restricts object interactions to immediate neighbors to minimize coupling and prevent information leakage. ([source](https://java-design-patterns.com/principles/))
- [Robustness Principles](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/robustness-principles.md) — Outlines guidelines for designing systems that interact gracefully with unexpected inputs. ([source](https://java-design-patterns.com/principles/))
- [Interface Segregation Principles](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/solid-principles/interface-segregation-principles.md) — Advocates for splitting monolithic interfaces into smaller, client-specific components to improve system design. ([source](https://java-design-patterns.com/principles/))
- [Liskov Substitution Principles](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/foundational-theory-and-guidance/software-architecture-principles/solid-principles/liskov-substitution-principles.md) — Clarifies how to ensure subclasses remain interchangeable with superclasses without breaking program correctness. ([source](https://java-design-patterns.com/principles/))

### Development Tools & Productivity

- [Algorithmic Utilities](https://awesome-repositories.com/f/development-tools-productivity/developer-utilities-libraries/programming-logic-libraries/utility-libraries/algorithmic-utilities.md) — Offers stateless, functional code snippets for executing discrete computational tasks.
- [File System Utilities](https://awesome-repositories.com/f/development-tools-productivity/developer-utilities-libraries/workflow-productivity-enhancers/developer-productivity-utilities/developer-utilities/file-resource-management/file-system-utilities.md) — Provides code examples for performing common file system operations. ([source](https://java-design-patterns.com/snippets/))

### Programming Languages & Runtimes

- [Java Resources](https://awesome-repositories.com/f/programming-languages-runtimes/programming-utilities/language-learning-resources/java-resources.md) — Applies idiomatic coding standards and proven patterns to improve productivity in Java development.

### Business & Productivity Software

- [Developer Learning Resources](https://awesome-repositories.com/f/business-productivity-software/knowledge-content-creation/knowledge-information-management/knowledge-management-systems/developer-learning-resources.md) — Functions as a centralized repository of best practices and implementation examples to support ongoing developer skill development.