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    <title>Elegant Objects</title>
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    <section>
      <p>
        <img src="//www.yegor256.com/images/books/elegant-objects/cactus.svg" alt="EO logo" class="logo"/>
      </p>
      <p>
        <strong>Elegant Objects</strong> (EO) is an object-oriented programming
        paradigm that renounces traditional techniques like
	      <a href="http://www.yegor256.com/2014/05/13/why-null-is-bad.html">null</a>,
        <a href="http://www.yegor256.com/2014/09/16/getters-and-setters-are-evil.html">getters-and-setters</a>,
	      <a href="http://www.yegor256.com/2015/05/07/ctors-must-be-code-free.html">code in constructors</a>,
        <a href="http://www.yegor256.com/2014/06/09/objects-should-be-immutable.html">mutable objects</a>,
        <a href="http://www.yegor256.com/2014/05/05/oop-alternative-to-utility-classes.html">static methods</a>,
        <a href="http://www.yegor256.com/2016/04/12/java-annotations-are-evil.html">annotations</a>,
        <a href="http://www.yegor256.com/2015/04/02/class-casting-is-anti-pattern.html">type casting</a>,
        <a href="http://www.yegor256.com/2016/09/13/inheritance-is-procedural.html">implementation inheritance</a>,
        <a href="http://www.yegor256.com/2016/07/06/data-transfer-object.html">data objects</a>,
        <a href="http://www.yegor256.com/2014/09/10/anti-patterns-in-oop.html">etc.</a>
      </p>
      <p id="books">Books:</p>
      <ul>
        <li><a href="http://amzn.to/2BVeiNl">Object Thinking</a></li>
        <li><a href="http://www.yegor256.com/elegant-objects.html">Elegant Objects</a>
          (<a href="http://amzn.to/2BXdZSs">vol.1</a> and
          <a href="http://amzn.to/2BuFFP4">vol.2</a>)</li>
      </ul>
      <p>
        Telegram chats:
        <a href="https://t.me/elegantobjects">@elegantobjects</a> (English) and
        <a href="https://t.me/painofoop">@painofoop</a> (Russian).
      </p>
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      <p>
        Twitter:
        <a href="https://twitter.com/search?q=%23elegantobjects">#elegantobjects</a>.
      </p>
      <p>
        Videos:
      </p>
      <ul>
        <li><a href="https://vimeo.com/77415896">OOP is Dead! Long Live OODD!</a>
          by <a href="http://davewest.us/">David West</a></li>
        <li><a href="https://www.youtube.com/watch?v=cGcCcxx4xrg">Java vs OOP</a>
          by <a href="https://github.com/yegor256">@yegor256</a></li>
      </ul>
      <p id="events">Events:</p>
      <ul>
        <li><a href="https://www.meetup.com/Object-Thinking/">Object Thinking meetup</a></li>
      </ul>
      <p>
        Blogs:
      </p>
      <ul>
        <li><a href="http://www.yegor256.com/2014/11/20/seven-virtues-of-good-object.html">Seven Virtues of a Good Object</a>
          by <a href="https://github.com/yegor256">@yegor256</a></li>
    	  <li><a href="https://www.amihaiemil.com/2018/04/17/dolls-and-maquettes.html">Dolls and Maquettes</a>
    	    by <a href="https://github.com/amihaiemil">@amihaiemil</a></li>
	  <li><a href="https://www.vzurauskas.com">Programming Ideas</a>
	    by <a href="https://github.com/vzurauskas">@vzurauskas</a></li>
        <li><a href="https://proandroiddev.com/stop-crafting-your-time-bomb-39f2d26987e0">Stop Crafting Your "Time Bomb"</a>
          by <a href="https://github.com/ErickSumargo">@ErickSumargo</a></li>
      </ul>
      <p id="languages">
        Languages:
      </p>
      <ul>
        <li><a href="https://github.com/cqfn/eo">EO</a> (experimental)</li>
      </ul>
      <p id="principles">
        Principles:
      </p>
      <ul>
        <li>No null
          (<a href="http://www.yegor256.com/2014/05/13/why-null-is-bad.html">why?</a>)</li>
        <li>No code in constructors
          (<a href="http://www.yegor256.com/2015/05/07/ctors-must-be-code-free.html">why?</a>)</li>
        <li>No getters and setters
          (<a href="http://www.yegor256.com/2014/09/16/getters-and-setters-are-evil.html">why?</a>)</li>
        <li>No mutable objects
          (<a href="http://www.yegor256.com/2014/06/09/objects-should-be-immutable.html">why?</a>)</li>
        <li>No readers, parsers, controllers, sorters, and so on
          (<a href="https://www.yegor256.com/2015/03/09/objects-end-with-er.html">why?</a>)</li>
        <li>No static methods, not even private ones
          (<a href="http://www.yegor256.com/2017/02/07/private-method-is-new-class.html">why?</a>)</li>
        <li>No instanceof, type casting, or reflection
          (<a href="http://www.yegor256.com/2015/04/02/class-casting-is-anti-pattern.html">why?</a>)</li>
        <li>No public methods without a contract (interface)
          (<a href="https://www.yegor256.com/2014/11/20/seven-virtues-of-good-object.html#2-he-works-by-contracts">why?</a>)</li>
        <li>No statements in test methods except assertThat
          (<a href="http://www.yegor256.com/2017/05/17/single-statement-unit-tests.html">why?</a>)</li>
        <li>No ORM or ActiveRecord
          (<a href="https://www.yegor256.com/2014/12/01/orm-offensive-anti-pattern.html">why?</a>
          and <a href="https://www.yegor256.com/2016/07/26/active-record.html">why?</a>)</li>
        <li>No implementation inheritance
          (<a href="http://www.yegor256.com/2017/01/31/decorating-envelopes.html">why?</a>
          and <a href="http://www.yegor256.com/2016/09/13/inheritance-is-procedural.html">why?</a>)</li>
      </ul>
      <p>
        Frameworks/libraries:
      </p>
      <ul>
        <li><a href="https://github.com/yegor256/takes">Takes</a>
          by <a href="https://github.com/yegor256">@yegor256</a> (Java)</li>
        <li><a href="https://github.com/yegor256/cactoos">Cactoos</a>
          by <a href="https://github.com/yegor256">@yegor256</a> (Java)</li>
        <li><a href="https://github.com/icarus-consulting/Yaapii.Atoms">Atoms</a>
          by <a href="https://github.com/icarus-consulting">@icarus-consulting</a> (C#)</li>
        <li><a href="https://github.com/neonailol/kactoos">Kactoos</a>
          by <a href="https://github.com/neonailol">@neonailol</a> (Kotlin)</li>
        <li><a href="https://github.com/Vatavuk/excel-io">excel-io</a>
          by <a href="https://github.com/Vatavuk">@Vatavuk</a> (Java)</li>
        <li><a href="https://github.com/g4s8/cactoos-crypto">cactoos-crypto
          by <a href="https://github.com/g4s8">@g4s8</a> (Java)</a></li>
        <li><a href="https://github.com/llorllale/cactoos-matchers">cactoos-matchers</a>
          by <a href="https://github.com/llorllale">@llorllale</a> (Java)</li>
        <li><a href="https://github.com/VsSekorin/cactoos-math">cactoos-math</a>
          by <a href="https://github.com/VsSekorin">@VsSekorin</a> (Java)</li>
        <li><a href="https://github.com/yegor256/cactoos-http">cactoos-http</a>
          by <a href="https://github.com/yegor256">@yegor256</a> (Java)</li>
        <li><a href="https://github.com/fabriciofx/cactoos-jdbc">cactoos-jdbc</a>
          by <a href="https://github.com/fabriciofx">@fabriciofx</a> (Java)</li>
	      <li><a href="https://github.com/VsSekorin/cactoos-json">cactoos-json</a>
          by <a href="https://github.com/VsSekorin">@VsSekorin</a> (Java)</li>
	      <li><a href="https://github.com/decorators-squad/eo-yaml">eo-yaml</a>
          by <a href="https://github.com/amihaiemil">@amihaiemil</a> (Java)</li>
      	<li><a href="https://github.com/amihaiemil/docker-java-api">docker-java-api</a>
          by <a href="https://github.com/amihaiemil">@amihaiemil</a> (Java)</li>
        <li><a href="https://github.com/CrocInc/sql-boot">sql-boot</a>
          by <a href="https://twitter.com/GraminMaksim">@mgramin</a> (Kotlin)</li>
        <li><a href="https://github.com/DronMDF/2out">2out</a>
          by <a href="https://github.com/DronMDF">@DronMDF</a> (C++)</li>
        <li><a href="https://github.com/victornoel/eo-envelopes">eo-envelopes</a>
          by <a href="https://github.com/victornoel">@victornoel</a> (Java)</li>
        <li><a href="https://github.com/g4s8/matchers-json">matchers-json</a>
          by <a href="https://github.com/g4s8">@g4s8</a> (Java)</li>
        <li><a href="https://github.com/dgroup/enumerable4j">enumerable4j</a>
          by <a href="https://github.com/dgroup">@dgroup</a> (Java)</li>
        <li><a href="https://github.com/dgroup/laconic-velocity">laconic-velocity</a>
          by <a href="https://github.com/dgroup">@dgroup</a> (Java)</li>
        <li><a href="https://github.com/dgroup/lazylead">lazylead</a>
          by <a href="https://github.com/dgroup">@dgroup</a> (Ruby)</li>
	    <li><a href="https://github.com/dgroup/xlsx-matchers">xlsx-matchers</a>
          by <a href="https://github.com/dgroup">@dgroup</a> (Java)</li>
        <li><a href="https://dry-rb.org/gems/dry-struct/">dry-struct</a>
          by <a href="https://github.com/dry-rb">@dry-rb</a> (ruby)</li>
        <li><a href="https://github.com/dgroup/term4j">term4j</a>
            by <a href="https://github.com/dgroup">@dgroup</a> (Java)</li>
        <li><a href="https://github.com/dgroup/mbox4j">mbox4j</a>
          by <a href="https://github.com/dgroup">@dgroup</a> (Java)</li>
        <li><a href="https://github.com/guseyn/page">Page</a>
            by <a href="https://github.com/guseyn">@guseyn</a> (Node.js)</li>
        <li><a href="https://github.com/guseyn/cutie">cutie</a>
            by <a href="https://github.com/guseyn">@guseyn</a> (Node.js)</li>
        <li><a href="https://github.com/Vatavuk/verano-http">verano-http</a>
          by <a href="https://github.com/Vatavuk">@Vatavuk</a> (Java)</li>
	<li><a href="https://github.com/icarus-consulting/Yaapii.Http">yaapii.http</a>
          by <a href="https://github.com/icarus-consulting">C# port of verano-http</a> (C#)</li>
	<li><a href="https://github.com/Meerownymous/ZiZZi">ZiZZi</a> Declarative object oriented data printers
          by <a href="https://github.com/Meerownymous">Meerownymous</a> (C#)</li>
	<li><a href="https://github.com/icarus-consulting/BriX">BriX</a>
          by <a href="https://github.com/icarus-consulting">OOP printable data structures</a> (C#)</li>
        <li><a href="https://github.com/icarus-consulting/Xive">Xive</a>
          by <a href="https://github.com/icarus-consulting">@icarus-consulting</a> (C#)</li>
	      <li><a href="https://github.com/proshin-roman/finapi-java-client">finapi-java-client</a>
          by <a href="https://github.com/proshin-roman">@proshin-roman</a> (Java)</li>
        <li><a href="https://github.com/nikialeksey/nullfree">nullfree</a>
          by <a href="https://github.com/nikialeksey">@nikialeksey</a> (Java)</li>
        <li><a href="https://github.com/vzurauskas/nereides-jackson">nereides-jackson</a>
          by <a href="https://github.com/vzurauskas">@vzurauskas</a> (Java)</li>
        <li><a href="https://github.com/vzurauskas/nereides-javax">nereides-javax</a>
          by <a href="https://github.com/vzurauskas">@vzurauskas</a> (Java)</li>
        <li><a href="https://github.com/elegant-bro">elegant-projects</a>
          by <a href="https://github.com/orgs/elegant-bro/projects">elegant-bro</a> (PHP, Golang)</li>
        <li><a href="https://github.com/roch1990/peon">peon</a>
          by <a href="https://github.com/roch1990">@roch1990</a> (Python3)</li>
        <li><a href="https://github.com/maxonfjvipon/ElegantElephant">ElegantElephant</a>
          by <a href="https://github.com/maxonfjvipon">@maxonfjvipon</a> (PHP)</li>
	<li><a href="https://github.com/kerelape/reikai">Reikai</a>
	  by <a href="https://github.com/kerelape">@kerelape</a> (Kotlin)</li>
        <li><a href="https://www.elegram-api.ru/">elegram-api</a>
          by <a href="https://github.com/l3r8yJ">@l3r8yJ</a> (Java)</li>
        <li><a href="https://eo-cqrs.github.io/eo-kafka/">eo-kafka</a>
          by <a href="https://github.com/eo-cqrs">@EO-CQRS</a> (Java)</li>
      </ul>
      <p>
        Products:
      </p>
      <ul>
        <li><a href="https://www.jare.io">Jare.io</a> / <a href="https://github.com/yegor256/jare">sources</a></li>
        <li><a href="https://www.wring.io">Wring.io</a> / <a href="https://github.com/yegor256/wring">sources</a></li>
        <li><a href="https://www.jpeek.org">Jpeek.org</a> / <a href="https://github.com/yegor256/jpeek">sources</a></li>
        <li><a href="http://charles.amihaiemil.com/">Charles-rest</a> / <a href="https://github.com/opencharles/charles-rest">sources</a></li>
        <li><a href="https://self-xdsd.com/">Self XDSD</a> / <a href="https://github.com/self-xdsd">sources</a></li>
        <li><a href="https://plugins.jetbrains.com/plugin/14706-decorate-me">Decorate.me</a> / <a href="https://github.com/stepanvalyavskiy/Decorate.me">sources</a></li>
      </ul>
      <p>
        If your project is <a href="http://www.yegor256.com/2015/06/08/deadly-sins-software-project.html">maintained well</a>
        and designed with the EO spirit in mind,
        please submit it to the <a href="http://www.yegor256.com/award.html">annual quality award</a>
        and win up to $4,096.
      </p>
      <p>
        Fans (in alphabetical order):
        <a href="https://github.com/a2xchip">@a2xchip</a>,
        <a href="https://github.com/acidlynx">@acidlynx</a>,
        <a href="https://github.com/admin1475963">@admin1475963</a>,
        <a href="https://github.com/aikidistas">@aikidistas</a>,
        <a href="https://github.com/aistomin">@aistomin</a>,
        <a href="https://github.com/alex-semenyuk">@alex-semenyuk</a>,
        <a href="https://github.com/alhadhrami">@alhadhrami</a>,
        <a href="https://github.com/aliceice">@aliceice</a>,
        <a href="https://twitter.com/amihaiemil">@amihaiemil</a>,
        <a href="https://github.com/andreoss">@andreoss</a>,
        <a href="https://github.com/AndreiGurko">@AndreiGurko</a>,
        <a href="https://github.com/baudoliver7">@baudoliver7</a>,
        <a href="https://github.com/biboran">@biboran</a>,
        <a href="https://github.com/birdflu">@birdflu</a>,
        <a href="https://github.com/dgroup">@dgroup</a>,
        <a href="https://github.com/dionisvl">@dionisvl</a>,
        <a href="https://twitter.com/dmydlarz">@dmydlarz</a>,
        <a href="https://github.com/driver733">@driver733</a>,
        <a href="https://github.com/DronMDF">@DronMDF</a>,
        <a href="https://twitter.com/eduardsi">@eduardsi</a>,
        <a href="https://github.com/Empiree">@Empiree</a>,
        <a href="https://github.com/ErickSumargo">@ErickSumargo</a>,
        <a href="https://github.com/fabriciofx">@fabriciofx</a>,
        <a href="https://github.com/filfreire">@filfreire</a>,
        <a href="https://github.com/g4s8">@g4s8</a>,
        <a href="https://github.com/gennadygennady">@gennadygennady</a>,
        <a href="https://github.com/Graur">@Graur</a>,
        <a href="https://github.com/h1alexbel">@h1alexbel</a>,
        <a href="https://github.com/horw">@horw</a>,
        <a href="https://github.com/iskanred">@iskanred</a>,
        <a href="https://github.com/ivanovmg">@ivanovmg</a>,
        <a href="https://github.com/kerelape">@kerelape</a>,
        <a href="https://github.com/koeeenig">@koeeenig</a>,
        <a href="https://github.com/kogoia">@kogoia</a>,
        <a href="https://github.com/kudima03">@kudima03</a>,
        <a href="https://github.com/Karpikova">@Karpikova</a>,
        <a href="https://github.com/l3r8yJ/">@l3r8yJ</a>,
        <a href="https://github.com/Maratori">@maratori</a>,
        <a href="https://github.com/marijnz0r">@marijnz0r</a>,
        <a href="https://github.com/maxonfjvipon">@maxonfjvipon</a>,
        <a href="https://github.com/Meerownymous">@meerownymous</a>,
        <a href="https://twitter.com/GraminMaksim">@mgramin</a>,
        <a href="https://github.com/Masynchin">@Masynchin</a>,
        <a href="https://github.com/MrHadiSatrio">@MrHadiSatrio</a>,
        <a href="https://github.com/MyNameIsNeXTSTEP">@MyNameIsNeXTSTEP</a>,
        <a href="https://github.com/nakhodkiin">@nakhodkiin</a>,
        <a href="https://twitter.com/nicholasruunu">@nicholasruunu</a>,
        <a href="https://github.com/nikialeksey">@nikialeksey</a>,
        <a href="https://github.com/NickKhalow/">@NickKhalow</a>,
        <a href="https://github.com/paulodamaso">@paulodamaso</a>,
        <a href="https://github.com/peterburenkov">@peterburenkov</a>,
        <a href="https://github.com/pinguinjkeke">@pinguinjkeke</a>,
        <a href="https://github.com/pnatashap">@pnatashap</a>,
        <a href="https://github.com/proshin-roman">@proshin-roman</a>,
        <a href="https://github.com/raffaeleflorio">@raffaeleflorio</a>,
        <a href="https://github.com/ratra1">@ratra1</a>,
        <a href="https://github.com/roch1990">@roch1990</a>,
        <a href="https://github.com/rocket-3">@rocket-3</a>,
        <a href="https://github.com/rus4j">@rus4j</a>,
        <a href="https://twitter.com/RRochegude">@RRochegude</a>,
        <a href="https://github.com/sitnikovik">@sitnikovik</a>,
        <a href="https://github.com/sivaa">@sivaa</a>,
        <a href="https://github.com/smallcreep">@smallcreep</a>,
        <a href="https://github.com/stepanets">@stepanets</a>,
        <a href="https://github.com/stepanvalyavskiy">@stepanvalyavskiy</a>,
        <a href="https://github.com/swardana">@swardana</a>,
        <a href="https://github.com/Samdespion">@Samdespion</a>,
        <a href="https://github.com/silasreinagel">@SilasReinagel</a>,
        <a href="https://github.com/t-izbassar">@t-izbassar</a>,
        <a href="https://github.com/tihon49">@tihon49</a>,
        <a href="https://twitter.com/tomasz_bawor">@tomasz_bawor</a>,
        <a href="https://github.com/uchitsa">@uchitsa</a>,
        <a href="https://github.com/Vatavuk">@vatavuk</a>,
        <a href="https://github.com/vblinden">@vblinden</a>,
        <a href="https://github.com/vhood">@vhood</a>,
        <a href="https://github.com/VsSekorin">@vssekorin</a>,
        <a href="https://github.com/vstan02">@vstan02</a>,
        <a href="https://github.com/vzurauskas">@vzurauskas</a>,
        <a href="https://github.com/xXdatelXx">@xXdatelXx</a>,
        <a href="https://github.com/yegor256">@yegor256</a>,
        <a href="https://github.com/ziplla">@ziplla</a>.
      </p>
      <p>
        Badges for your GitHub repo:
        <p>
        <img src="//www.elegantobjects.org/badge.svg" alt="EO badge"/>
      </p>
      <p>--</p>
      <p>
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