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- properly categorize all patterns - remove pattern list from readme - minor fixes to readme - removed "introduction" because its not a pattern and an error i committed some time ago
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‎README.md‎

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# Design pattern samples in Java.
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<!-- the line below needs to be an empty line C: (its because kramdown isnt
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that smart and dearly wants an empty line before a heading to be able to
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display it as such, e.g. website) -->
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# Design pattern samples in Java
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[![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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src="https://scan.coverity.com/projects/5634/badge.svg"/>
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</a>
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<a name="top"/>
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#### Browse and view all of the patterns on our Website: [iluwatar.github.io/java-design-patterns/](https://iluwatar.github.io/java-design-patterns/)
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<a name="top"/>
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# <a name="toc">Table of Contents</a>
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- <a href="#introduction">Introduction</a>
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- <a href="#list-of-design-patterns">List of Design Patterns</a>
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- <a href="#creational-patterns">Creational Patterns</a>
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- <a href="#structural-patterns">Structural Patterns</a>
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- <a href="#behavioral-patterns">Behavioral Patterns</a>
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- <a href="#concurrency-patterns">Concurrency Patterns</a>
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- <a href="#presentation-tier-patterns">Presentation Tier Patterns</a>
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- <a href="#business-tier-patterns">Business Tier Patterns</a>
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- <a href="#architectural-patterns">Architectural Patterns</a>
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- <a href="#integration-patterns">Integration Patterns</a>
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- <a href="#idioms">Idioms</a>
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- <a href="#faq">Frequently Asked Questions</a>
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- <a href="#how-to-contribute">How to contribute</a>
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- <a href="#versioning">Versioning</a>
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- <a href="#credits">Credits</a>
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- <a href="#license">License</a>
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## <a name="introduction">Introduction</a>
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problems, and it also improves code readability for coders and architects who
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are familiar with the patterns.
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## <a name="list-of-design-patterns">List of Design Patterns</a> [&#8593;](#top)
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### <a name="creational-patterns">Creational Patterns</a> [&#8593;](#top)
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Creational design patterns abstract the instantiation process. They help make a
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system independent of how its objects are created, composed, and represented.
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* [Abstract Factory](#abstract-factory)
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* [Builder](#builder)
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* [Factory Method](#factory-method)
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* [Prototype](#prototype)
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* [Property](#property)
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* [Singleton](#singleton)
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* [Step Builder](#step-builder)
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* [Multiton](#multiton)
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* [Object Pool](#object-pool)
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### <a name="structural-patterns">Structural Patterns</a> [&#8593;](#top)
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Structural patterns are concerned with how classes and objects are composed to
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form larger structures.
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* [Adapter](#adapter)
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* [Bridge](#bridge)
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* [Composite](#composite)
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* [Decorator](#decorator)
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* [Facade](#facade)
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* [Flyweight](#flyweight)
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* [Proxy](#proxy)
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* [Service Locator](#service-locator)
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* [Servant](#servant)
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* [Event Aggregator](#event-aggregator)
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### <a name="behavioral-patterns">Behavioral Patterns</a> [&#8593;](#top)
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Behavioral patterns are concerned with algorithms and the assignment of
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responsibilities between objects.
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* [Chain of responsibility](#chain-of-responsibility)
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* [Command](#command)
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* [Interpreter](#interpreter)
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* [Iterator](#iterator)
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* [Mediator](#mediator)
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* [Memento](#memento)
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* [Observer](#observer)
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* [State](#state)
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* [Strategy](#strategy)
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* [Template method](#template-method)
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* [Visitor](#visitor)
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* [Null Object](#null-object)
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* [Intercepting Filter](#intercepting-filter)
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* [Specification](#specification)
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* [Dependency Injection](#dependency-injection)
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### <a name="concurrency-patterns">Concurrency Patterns</a> [&#8593;](#top)
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Concurrency patterns are those types of design patterns that deal with the
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multi-threaded programming paradigm.
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* [Double Checked Locking](#double-checked-locking)
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* [Thread Pool](#thread-pool)
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* [Async Method Invocation](#async-method-invocation)
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* [Half-Sync/Half-Async](#half-sync-half-async)
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### <a name="presentation-tier-patterns">Presentation Tier Patterns</a> [&#8593;](#top)
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Presentation Tier patterns are the top-most level of the application, this is
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concerned with translating tasks and results to something the user can
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understand.
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* [Model-View-Controller](#model-view-controller)
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* [Model-View-Presenter](#model-view-presenter)
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* [Flux](#flux)
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* [Front Controller](#front-controller)
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### <a name="business-tier-patterns">Business Tier Patterns</a> [&#8593;](#top)
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* [Business Delegate](#business-delegate)
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### <a name="architectural-patterns">Architectural Patterns</a> [&#8593;](#top)
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An architectural pattern is a general, reusable solution to a commonly occurring
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problem in software architecture within a given context.
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* [Data Access Object](#dao)
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* [Service Layer](#service-layer)
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* [Naked Objects](#naked-objects)
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* [Repository](#repository)
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### <a name="integration-patterns">Integration Patterns</a> [&#8593;](#top)
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Integration patterns are concerned with how software applications communicate
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and exchange data.
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* [Tolerant Reader](#tolerant-reader)
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### <a name="idioms">Idioms</a> [&#8593;](#top)
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A programming idiom is a means of expressing a recurring construct in one or
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more programming languages. Generally speaking, a programming idiom is an
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expression of a simple task, algorithm, or data structure that is not a built-in
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feature in the programming language being used, or, conversely, the use of an
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unusual or notable feature that is built into a programming language. What
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distinguishes idioms from patterns is generally the size, the idioms tend to be
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something small while the patterns are larger.
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* [Execute Around](#execute-around)
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* [Poison Pill](#poison-pill)
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* [Callback](#callback)
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* [Lazy Loading](#lazy-loading)
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* [Double Dispatch](#double-dispatch)
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* [Resource Acquisition Is Initialization](#resource-acquisition-is-initialization)
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* [Private Class Data](#private-class-data)
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# <a name="faq">Frequently asked questions</a> [&#8593;](#top)
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* src (the source code of the pattern)
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* index.md (the description of the pattern)
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* pom.xml (the maven pom.xml)
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3. Implement the code changes in your fork. Remember to add sufficient comments
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4. Implement the code changes in your fork. Remember to add sufficient comments
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documenting the implementation. Reference the issue id e.g. #52 in your
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commit messages.
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4. Format the code according to [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html)
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5. Format the code according to [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html)
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* [Eclipse configuration](https://github.com/google/styleguide/blob/gh-pages/eclipse-java-google-style.xml)
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* [IntelliJ configuration](https://github.com/google/styleguide/blob/gh-pages/intellij-java-google-style.xml)
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5. Create a simple class diagram from your example code and put it inside of the etc folder.
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6. Add description of the pattern in index.md and link to the class diagram.
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6. Create a simple class diagram from your example code and put it inside of the etc folder.
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7. Add description of the pattern in index.md and link to the class diagram.
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(Attention, all internal links must be relative to the pattern subdirectory, else the links dont link properly on the website)
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7. Create a pull request.
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8. Create a pull request.
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**Structure of the index.md file**
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‎abstract-factory/index.md‎

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title: Abstract Factory
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folder: abstract-factory
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permalink: /patterns/abstract-factory/
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categories:
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- pattern_cat
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- creational
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tags: pattern_tag
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categories: Creational
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tags: Java
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---
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**Intent:** Provide an interface for creating families of related or dependent

‎adapter/index.md‎

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title: Adapter
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folder: adapter
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permalink: /patterns/adapter/
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categories: structural
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tags: pattern_tag
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categories: Structural
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tags: Java
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**Intent:** Convert the interface of a class into another interface the clients

‎async-method-invocation/index.md‎

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title: Async Method Invocation
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folder: async-method-invocation
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permalink: /patterns/async-method-invocation/
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categories: concurrency
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tags: pattern_tag
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categories: Concurrency
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tags: Java
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---
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**Intent:** Asynchronous method invocation is pattern where the calling thread

‎bridge/index.md‎

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title: Bridge
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folder: bridge
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permalink: /patterns/bridge/
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categories: structural
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tags: pattern_tag
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categories: Structural
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tags: Java
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**Intent:** Decouple an abstraction from its implementation so that the two can

‎builder/index.md‎

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title: Builder
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folder: builder
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permalink: /patterns/builder/
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categories: creational
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tags: pattern_tag
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categories: Creational
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tags: Java
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**Intent:** Separate the construction of a complex object from its

‎business-delegate/index.md‎

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title: Business Delegate
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folder: business-delegate
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permalink: /patterns/business-delegate/
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categories: business_tier
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categories: Business Tier
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tags: Java
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**Intent:** The Business Delegate pattern adds an abstraction layer between

‎callback/index.md‎

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title: Callback
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folder: callback
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permalink: /patterns/callback/
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categories: pattern_cat
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tags: pattern_tag
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categories: Other
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tags: Java
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**Intent:** Callback is a piece of executable code that is passed as an

‎chain-of-responsibility/index.md‎

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title: Chain of responsibility
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folder: chain-of-responsibility
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permalink: /patterns/chain-of-responsibility/
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categories: behavioral
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categories: Behavioral
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tags: Java
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**Intent:** Avoid coupling the sender of a request to its receiver by giving

‎command/index.md‎

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title: Command
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folder: command
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permalink: /patterns/command/
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categories: Behavioral
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tags: Java
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**Intent:** Encapsulate a request as an object, thereby letting you

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