https://java-design-patterns.com/assets/js/patterns_abstract-factory_index.html.17f316d8.js

1"use strict";(self.webpackChunkjava_design_patterns_vuepress_web=self.webpackChunkjava_design_patterns_vuepress_web||[]).push([[28044],{55615(s,i){i.A=(s,i)=>{const a=s.__vccOpts||s;for(const[s,n]of i)a[s]=n;return a}},86844(s,i,a){a.r(i),a.d(i,{comp:()=>l,data:()=>r});var n=a(19195);const e=a.p+"assets/img/abstract-factory.urm.194342a5.png",t={},l=(0,a(55615).A)(t,[["render",function(s,i){return(0,n.uX)(),(0,n.CE)("div",null,[...i[0]||(i[0]=[(0,n.Fv)('<h2 id="also-known-as" tabindex="-1"><a class="header-anchor" href="#also-known-as"><span>Also known as</span></a></h2><ul><li>Kit</li></ul><h2 id="intent-of-abstract-factory-design-pattern" tabindex="-1"><a class="header-anchor" href="#intent-of-abstract-factory-design-pattern"><span>Intent of Abstract Factory Design Pattern</span></a></h2><p>The Abstract Factory pattern in Java provides an interface for creating families of related or dependent objects without specifying their concrete classes, enhancing modularity and flexibility in software design.</p><h2 id="detailed-explanation-of-abstract-factory-pattern-with-real-world-examples" tabindex="-1"><a class="header-anchor" href="#detailed-explanation-of-abstract-factory-pattern-with-real-world-examples"><span>Detailed Explanation of Abstract Factory Pattern with Real-World Examples</span></a></h2><p>Real-world example</p><blockquote><p>Imagine a furniture company that uses the Abstract Factory pattern in Java to produce various styles of furniture: modern, Victorian, and rustic. Each style includes products like chairs, tables, and sofas. To ensure consistency within each style, the company uses an Abstract Factory pattern.</p><p>In this scenario, the Abstract Factory is an interface for creating families of related furniture objects (chairs, tables, sofas). Each concrete factory (ModernFurnitureFactory, VictorianFurnitureFactory, RusticFurnitureFactory) implements the Abstract Factory interface and creates a set of products that match the specific style. This way, clients can create a whole set of modern or Victorian furniture without worrying about the details of their instantiation. This maintains a consistent style and allows easy swapping of one style of furniture for another.</p></blockquote><p>In plain words</p><blockquote><p>A factory of factories; a factory that groups the individual but related/dependent factories together without specifying their concrete classes.</p></blockquote><p>Wikipedia says</p><blockquote><p>The abstract factory pattern provides a way to encapsulate a group of individual factories that have a common theme without specifying their concrete classes</p></blockquote><p>Class diagram</p><p><img src="'+e+'" alt="Abstract Factory class diagram" title="Abstract Factory class diagram"></p><h2 id="programmatic-example-of-abstract-factory-in-java" tabindex="-1"><a class="header-anchor" href="#programmatic-example-of-abstract-factory-in-java"><span>Programmatic Example of Abstract Factory in Java</span></a></h2><p>To create a kingdom using the Abstract Factory pattern in Java, we need objects with a common theme. The elven kingdom needs an elven king, elven castle, and elven army whereas the orcish kingdom needs an orcish king, orcish castle, and orcish army. There is a dependency between the objects in the kingdom.</p><p>Translating the kingdom example above. First of all, we have some interfaces and implementation for the objects in the kingdom.</p><div class="language-java line-numbers-mode" data-highlighter="shiki" data-ext="java" style="--shiki-light:#383A42;--shiki-dark:#abb2bf;--shiki-light-bg:#FAFAFA;--shiki-dark-bg:#282c34;"><pre class="shiki shiki-themes one-light one-dark-pro vp-code"><code class="language-java"><span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> interface</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> Castle</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;">    String</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">}</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> interface</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> King</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;">    String</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">}</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> interface</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> Army</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;">    String</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">}</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A0A1A7;--shiki-light-font-style:italic;--shiki-dark:#7F848E;--shiki-dark-font-style:italic;">// Elven implementations -&gt;</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> class</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> ElfCastle</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> implements</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> Castle</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    static</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> final</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> String</span><span style="--shiki-light:#E45649;--shiki-dark:#E06C75;"> DESCRIPTION </span><span style="--shiki-light:#383A42;--shiki-dark:#56B6C2;">=</span><span style="--shiki-light:#50A14F;--shiki-dark:#98C379;"> &quot;This is the elven castle!&quot;</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">;</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    @</span><span style="--shiki-light:#A626A4;--shiki-dark:#E5C07B;">

1Override</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    public</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> String</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">()</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">        return</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> DESCRIPTION;</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    }</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">}</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> class</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> ElfKing</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> implements</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> King</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    static</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> final</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> String</span><span style="--shiki-light:#E45649;--shiki-dark:#E06C75;"> DESCRIPTION </span><span style="--shiki-light:#383A42;--shiki-dark:#56B6C2;">=</span><span style="--shiki-light:#50A14F;--shiki-dark:#98C379;"> &quot;This is the elven king!&quot;</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">;</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    @</span><span style="--shiki-light:#A626A4;--shiki-dark:#E5C07B;">Override</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    public</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> String</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">()</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">        return</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> DESCRIPTION;</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    }</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">}</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> class</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> ElfArmy</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> implements</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> Army</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    static</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> final</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> String</span><span style="--shiki-light:#E45649;--shiki-dark:#E06C75;"> DESCRIPTION </span><span style="--shiki-light:#383A42;--shiki-dark:#56B6C2;">=</span><span style="--shiki-light:#50A14F;--shiki-dark:#98C379;"> &quot;This is the elven Army!&quot;</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">;</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    @</span><span style="--shiki-light:#A626A4;--shiki-dark:#E5C07B;">Override</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    public</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> String</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">()</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">        return</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> DESCRIPTION;</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    }</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">}</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A0A1A7;--shiki-light-font-style:italic;--shiki-dark:#7F848E;--shiki-dark-font-style:italic;">// Orcish implementations similarly -&gt; ...</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>Then we have the abstraction and implementations for the kingdom factory.</p><div class="language-java line-numbers-mode" data-highlighter="shiki" data-ext="java" style="--shiki-light:#383A42;--shiki-dark:#abb2bf;--shiki-light-bg:#FAFAFA;--shiki-dark-bg:#282c34;"><pre class="shiki shiki-themes one-light one-dark-pro vp-code"><code class="language-java"><span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> interface</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> KingdomFactory</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;">    Castle</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> createCastle</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;">    King</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> createKing</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;">    Army</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> createArmy</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">}</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> class</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> ElfKingdomFactory</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> implements</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> KingdomFactory</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    @</span><span style="--shiki-light:#A626A4;--shiki-dark:#E5C07B;">

1Override</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    public</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> Castle</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> createCastle</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">()</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">        return</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> new</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> ElfCastle</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    }</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    @</span><span style="--shiki-light:#A626A4;--shiki-dark:#E5C07B;">Override</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    public</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> King</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> createKing</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">()</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">        return</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> new</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> ElfKing</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    }</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    @</span><span style="--shiki-light:#A626A4;--shiki-dark:#E5C07B;">Override</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    public</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> Army</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> createArmy</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">()</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">        return</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> new</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> ElfArmy</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    }</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">}</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A0A1A7;--shiki-light-font-style:italic;--shiki-dark:#7F848E;--shiki-dark-font-style:italic;">// Orcish implementations similarly -&gt; ...</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>Now, we can design a factory for our different kingdom factories. In this example, we created <code>FactoryMaker</code>, responsible for returning an instance of either <code>ElfKingdomFactory</code> or <code>OrcKingdomFactory</code>. The client can use <code>FactoryMaker</code> to create the desired concrete factory which, in turn, will produce different c

1oncrete objects (derived from <code>Army</code>, <code>King</code>, <code>Castle</code>). In this example, we also used an enum to parameterize which type of kingdom factory the client will ask for.</p><div class="language-java line-numbers-mode" data-highlighter="shiki" data-ext="java" style="--shiki-light:#383A42;--shiki-dark:#abb2bf;--shiki-light-bg:#FAFAFA;--shiki-dark-bg:#282c34;"><pre class="shiki shiki-themes one-light one-dark-pro vp-code"><code class="language-java"><span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> static</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> class</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> FactoryMaker</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> enum</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> KingdomType</span><span style="--shiki-light:#383A42;--shiki-dark:#E06C75;"> {</span></span>\n<span class="line"><span style="--shiki-light:#986801;--shiki-dark:#D19A66;">        ELF</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">,</span><span style="--shiki-light:#986801;--shiki-dark:#D19A66;"> ORC</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#E06C75;">    }</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">    public</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> static</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;"> KingdomFactory</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> makeFactory</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">(</span><span style="--shiki-light:#C18401;--shiki-dark:#E5C07B;">KingdomType</span><span style="--shiki-light:#383A42;--shiki-light-font-style:inherit;--shiki-dark:#E06C75;--shiki-dark-font-style:italic;"> type</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">)</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">        return</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> switch</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> (type) {</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">            case</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">

1 ELF </span><span style="--shiki-light:#C18401;--shiki-dark:#C678DD;">-&gt;</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> new</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> ElfKingdomFactory</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;">            case</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;"> ORC </span><span style="--shiki-light:#C18401;--shiki-dark:#C678DD;">-&gt;</span><span style="--shiki-light:#A626A4;--shiki-dark:#C678DD;"> new</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;"> OrcKingdomFactory</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">();</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">        };</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">    }</span></span>\n<span class="line"><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">}</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>Here is the main function of our example application:</p><div class="language-java line-numbers-mode" data-highlighter="shiki" data-ext="java" style="--shiki-light:#383A42;--shiki-dark:#abb2bf;--shiki-light-bg:#FAFAFA;--shiki-dark-bg:#282c34;"><pre class="shiki shiki-themes one-light one-dark-pro vp-code"><code class="language-java"><span class="line"><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">LOGGER</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">info</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">(</span><span style="--shiki-light:#50A14F;--shiki-dark:#98C379;">&quot;elf kingdom&quot;</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">);</span></span>\n<span class="line"><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">createKingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#E06C75;">(</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">Kingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">FactoryMaker</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">KingdomType</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">ELF</span><span style="--shiki-light:#383A42;--shiki-dark:#E06C75;">)</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">;</span></span>\n<span class="line"><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">LOGGER</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">info</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">(</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">

1kingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getArmy</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">().</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">());</span></span>\n<span class="line"><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">LOGGER</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">info</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">(</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">kingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getCastle</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">().</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">());</span></span>\n<span class="line"><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">LOGGER</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">info</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">(</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">

1kingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getKing</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">().</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">());</span></span>\n<span class="line"></span>\n<span class="line"><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">LOGGER</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">info</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">(</span><span style="--shiki-light:#50A14F;--shiki-dark:#98C379;">&quot;orc kingdom&quot;</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">);</span></span>\n<span class="line"><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">createKingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#E06C75;">(</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">Kingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">FactoryMaker</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">KingdomType</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">ORC</span><span style="--shiki-light:#383A42;--shiki-dark:#E06C75;">)</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">;</span></span>\n<span class="line"><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">LOGGER</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">info</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">(</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">

1kingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getArmy</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">().</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">());</span></span>\n<span class="line"><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">LOGGER</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">info</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">(</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">kingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getCastle</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">().</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">());</span></span>\n<span class="line"><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">LOGGER</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">info</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">(</span><span style="--shiki-light:#E45649;--shiki-dark:#E5C07B;">

1kingdom</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">.</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getKing</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">().</span><span style="--shiki-light:#4078F2;--shiki-dark:#61AFEF;">getDescription</span><span style="--shiki-light:#383A42;--shiki-dark:#ABB2BF;">());</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>The program output:</p><div class="language- line-numbers-mode" data-highlighter="shiki" data-ext="" style="--shiki-light:#383A42;--shiki-dark:#abb2bf;--shiki-light-bg:#FAFAFA;--shiki-dark-bg:#282c34;"><pre class="shiki shiki-themes one-light one-dark-pro vp-code"><code class="language-"><span class="line"><span>07:35:46.340 [main] INFO com.iluwatar.abstractfactory.App -- elf kingdom</span></span>\n<span class="line"><span>07:35:46.343 [main] INFO com.iluwatar.abstractfactory.App -- This is the elven army!</span></span>\n<span class="line"><span>07:35:46.343 [main] INFO com.iluwatar.abstractfactory.App -- This is the elven castle!</span></span>\n<span class="line"><span>07:35:46.343 [main] INFO com.iluwatar.abstractfactory.App -- This is the elven king!</span></span>\n<span class="line"><span>07:35:46.343 [main] INFO com.iluwatar.abstractfactory.App -- orc kingdom</span></span>\n<span class="line"><span>07:35:46.343 [main] INFO com.iluwatar.abstractfactory.App -- This is the orc army!</span></span>\n<span class="line"><span>07:35:46.343 [main] INFO com.iluwatar.abstractfactory.App -- This is the orc castle!</span></span>\n<span class="line"><span>07:35:46.343 [main] INFO com.iluwatar.abstractfactory.App -- This is the orc king!</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="when-to-use-the-abstract-factory-pattern-in-java" tabindex="-1"><a class="header-anchor" href="#when-to-use-the-abstract-factory-pattern-in-java"><span>When to Use the Abstract Factory Pattern in Java</span></a></h2><p>Use the Abstract Factory pattern in Java when:</p><ul><li>The system should be independent of how its products are created, composed, and represented.</li><li>You need to configure the system with one of multiple families of products.</li><li>A family of related product objects must be used together, enforcing consistency.</li><li>You want to provide a class library of products, exposing only their interfaces, not their implementations.</li><li>The lifetime of dependencies is shorter than the consumer&#39;s lifetime.</li><li>Dependencies need to be constructed using runtime values or parameters.</li><li>You need to choose which product to use from a family at runtime.</li><li>Adding new products or families should not require changes to existing code.</li></ul><h2 id="abstract-factory-pattern-java-tutorials" tabindex="-1"><a class="header-anchor" href="#abstract-factory-pattern-java-tutorials"><span>Abstract Factory Pattern Java Tutorials</span></a></h2><ul><li><a href="https://www.digitalocean.com/community/tutorials/abstract-factory-design-pattern-in-java" target="_blank" rel="noopener noreferrer">Abstract Factory Design Pattern in Java (DigitalOcean)</a></li><li><a href="https://refactoring.guru/design-patterns/abstract-factory" target="_blank" rel="noopener noreferrer">Abstract Factory(Refactoring Guru)</a></li></ul><h2 id="benefits-and-trade-offs-of-abstract-factory-pattern" tabindex="-1"><a class="header-anchor" href="#benefits-and-trade-offs-of-abstract-factory-pattern"><span>Benefits and Trade-offs of Abstract Factory Pattern</span></a></h2><p>Benefits:</p><ul><li><p>Flexibility: Easily switch between product families without code modifications.</p></li><li><p>Decoupling: Client code only interacts with abstract interfaces, promoting portability and maintainability.</p></li><li><p>Reusability: Abstract factories and products facilitate component reuse across projects.</p></li><li><p>Maintainability: Changes to individual product families are localized, simplifying updates.</p></li></ul><p>Trade-offs:</p><ul><li><p>Complexity: Defining abstract interfaces and concrete factories adds initial overhead.</p></li><li><p>Indirectness: Client code interacts with products indirectly through factories, potentially reducing transparency.</p></li></ul><h2 id="real-world-applications-of-abstract-factory-pattern-in-java" tabindex="-1"><a class="header-anchor" href="#real-world-applications-of-abstract-factory-pattern-in-java"><span>Real-World Applications of Abstract Factory Pattern in Java</span></a></h2><ul><li>Java Swing&#39;s <code>LookAndFeel</code>

1 classes for providing different look-and-feel options.</li><li>Various implementations in the Java Abstract Window Toolkit (AWT) for creating different GUI components.</li><li><a href="http://docs.oracle.com/javase/8/docs/api/javax/xml/parsers/DocumentBuilderFactory.html" target="_blank" rel="noopener noreferrer">javax.xml.parsers.DocumentBuilderFactory</a></li><li><a href="http://docs.oracle.com/javase/8/docs/api/javax/xml/transform/TransformerFactory.html#newInstance--" target="_blank" rel="noopener noreferrer">javax.xml.transform.TransformerFactory</a></li><li><a href="http://docs.oracle.com/javase/8/docs/api/javax/xml/xpath/XPathFactory.html#newInstance--" target="_blank" rel="noopener noreferrer">javax.xml.xpath.XPathFactory</a></li></ul><h2 id="related-java-design-patterns" tabindex="-1"><a class="header-anchor" href="#related-java-design-patterns"><span>Related Java Design Patterns</span></a></h2><ul><li><a href="https://java-design-patterns.com/patterns/factory-method/" target="_blank" rel="noopener noreferrer">Factory Method</a>: Abstract Factory uses Factory Methods to create products.</li><li><a href="https://java-design-patterns.com/patterns/singleton/" target="_blank" rel="noopener noreferrer">Singleton</a>: Abstract Factory classes are often implemented as Singletons.</li><li><a href="https://java-design-patterns.com/patterns/factory-kit/" target="_blank" rel="noopener noreferrer">Factory Kit</a>: Similar to Abstract Factory but focuses on configuring and managing a set of related objects in a flexible way.</li></ul><h2 id="references-and-credits" tabindex="-1"><a class="header-anchor" href="#references-and-credits"><span>References and Credits</span></a></h2><ul><li><a href="https://amzn.to/3w0pvKI" target="_blank" rel="noopener noreferrer">Design Patterns: Elements of Reusable Object-Oriented Software</a></li><li><a href="https://amzn.to/3Syw0vC" target="_blank" rel="noopener noreferrer">Design Patterns in Java</a></li><li><a href="https://amzn.to/49NGldq" target="_blank" rel="noopener noreferrer">Head First Design Patterns: Building Extensible and Maintainable Object-Oriented Software</a></li><li><a href="https://amzn.to/3HWNf4U" target="_blank" rel="noopener noreferrer">Java Design Patterns: A Hands-On Experience with Real-World Examples</a></li></ul>',41)])])}]]),r=JSON.parse('{"path":"/patterns/abstract-factory/","title":"Abstract Factory Pattern in Java: Mastering Object Creation Elegantly","lang":"en-US","frontmatter":{"title":"Abstract Factory Pattern in Java: Mastering Object Creation Elegantly","shortTitle":"Abstract Factory","description":"Learn the Abstract Factory pattern in Java with real-world examples, class diagrams, and tutorials. Understand its intent, applicability, benefits, and known uses to enhance your design pattern knowledge.","category":"Creational","language":"en","tag":["Abstraction","Decoupling","Gang of Four","Instantiation","Polymorphism"],"head":[["script",{"type":"application/ld+json"},"{\\"@context\\":\\"https://schema.org\\",\\"@type\\":\\"Article\\",\\"headline\\":\\"Abstract Factory Pattern in Java: Mastering Object Creation Elegantly\\",\\"image\\":[\\"\\"],\\"dateModified\\":null,\\"author\\":[{\\"@type\\":\\"Person\\",\\"name\\":\\"iluwatar\\",\\"url\\":\\"https://github.com/iluwatar/java-design-patterns-vuepress-web\\"}]}"],["meta",{"property":"og:url","content":"https://java-design-patterns.com/patterns/abstract-factory/"}],["meta",{"property":"og:site_name","content":"Java Design Patterns"}],["meta",{"property":"og:title","content":"Abstract Factory Pattern in Java: Mastering Object Creation Elegantly"}],["meta",{"property":"og:description","content":"Learn the Abstract Factory pattern in Java with real-world examples, class diagrams, and tutorials. Understand its intent, applicability, benefits, and known uses to enhance your design pattern knowledge."}],["meta",{"property":"og:type","content":"article"}],["meta",{"property":"og:locale","content":"en-US"}],["meta",{"property":"og:locale:alternate","content":"es-ES"}],["meta",{"property":"og:locale:alternate","content":"zh-CN"}

1],["meta",{"property":"article:tag","content":"Polymorphism"}],["meta",{"property":"article:tag","content":"Instantiation"}],["meta",{"property":"article:tag","content":"Gang of Four"}],["meta",{"property":"article:tag","content":"Decoupling"}],["meta",{"property":"article:tag","content":"Abstraction"}],["link",{"rel":"alternate","hreflang":"es-es","href":"https://java-design-patterns.com/es/patterns/abstract-factory/"}],["link",{"rel":"alternate","hreflang":"zh-cn","href":"https://java-design-patterns.com/zh/patterns/abstract-factory/"}]]},"git":{},"readingTime":{"minutes":3.66,"words":1097},"excerpt":"<h2>Also known as</h2>\\n<ul>\\n<li>Kit</li>\\n</ul>\\n<h2>Intent of Abstract Factory Design Pattern</h2>\\n<p>The Abstract Factory pattern in Java provides an interface for creating families of related or dependent objects without specifying their concrete classes, enhancing modularity and flexibility in software design.</p>"}')}}]);