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<!DOCTYPE html>
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<section class="kotlin-overview-section _features">
<h2 class="section-header">为什么使用Kotlin?</h2>
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<h3 class="feature-title">通用</h3>
<p class="feature-description">构建服务器端程序，Android程序或者运行在浏览器里的前端程序</p>
<span class="feature-example-link">See example</span>
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<p class="feature-description">重用已有的JVM平台框架或库，与Java无缝兼容</p>
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<p class="feature-description">命令行编译器还是一流的IDE支持，随意选</p>
<span class="feature-example-link">See example</span>
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<h3 id="section">简洁<a href="#section" class="anchor"></a></h3>
<p>使用一行代码创建一个包含getters, setters, <code>equals()</code>, <code>hashCode()</code>, <code>toString()</code> and <code>copy()</code> 的POJO</p>
<pre><code class="code-block _highlighted lang_kotlin"><span class="n">data</span> <span class="k">class</span> <span class="nc">Customer</span><span class="p">(</span><span class="k">val</span> <span class="py">name</span><span class="p">:</span> <span class="n">String</span><span class="p">,</span> <span class="k">val</span> <span class="py">email</span><span class="p">:</span> <span class="n">String</span><span class="p">,</span> <span class="k">val</span> <span class="py">company</span><span class="p">:</span> <span class="n">String</span><span class="p">)</span></code></pre>
<p>或者使用lambda表达式来过滤链表：</p>
<pre><code class="code-block _highlighted lang_kotlin"><span class="k">val</span> <span class="py">positiveNumbers</span> <span class="p">=</span> <span class="n">list</span><span class="p">.</span><span class="n">filter</span> <span class="p">{</span><span class="n">it</span> <span class="p">></span> <span class="m">0</span><span class="p">}</span></code></pre>
<p>想要单例？创建object就可以了：</p>
<pre><code class="code-block _highlighted lang_kotlin"><span class="k">object</span> <span class="nc">ThisIsASingleton</span> <span class="p">{</span>
<span class="k">val</span> <span class="py">companyName</span><span class="p">:</span> <span class="n">String</span> <span class="p">=</span> <span class="s">"JetBrains"</span>
<span class="p">}</span></code></pre>
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data-popup-id="kotlin-feature_concise"></div>
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id="kotlin-feature_safe">
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<h3 id="section">安全<a href="#section" class="anchor"></a></h3>
<p>彻底告别那些烦人的 NullPointerExceptions, <a href="http://www.infoq.com/presentations/Null-References-The-Billion-Dollar-Mistake-Tony-Hoare">毕竟价值万亿</a></p>
<pre><code class="code-block _highlighted lang_kotlin"><span class="k">var</span> <span class="py">output</span> <span class="p">:</span> <span class="n">String</span>
<span class="n">output</span> <span class="p">=</span> <span class="k">null</span></code></pre>
<p>And of course, Kotlin protects you from mistakenly operating on nullable types,
including those from Java
Kotlin会预防你对可能为null的对象进行操作, 哪怕是Java中传递过来的</p>
<pre><code class="code-block _highlighted lang_kotlin"><span class="n">println</span><span class="p">(</span><span class="n">output</span><span class="p">.</span><span class="n">length</span><span class="p">())</span></code></pre>
<p>如果你进行了类型检测, 那么编译器会在检测后的代码分支内自动帮你转换类型</p>
<pre><code class="code-block _highlighted lang_kotlin"><span class="k">fun</span> <span class="nf">calculateTotal</span><span class="p">(</span><span class="n">obj</span><span class="p">:</span> <span class="n">Any</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">obj</span> <span class="k">is</span> <span class="n">Invoice</span><span class="p">)</span> <span class="p">{</span>
<span class="n">obj</span><span class="p">.</span><span class="n">calculateTotal</span><span class="p">()</span>
<span class="p">}</span>
<span class="p">}</span></code></pre>
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<h3>通用性</h3>
<p>多用途的语言可用于构建各式各样的程序</p>
<div class="logos-list">
<p class="logos-list-item">
<span class="logo _android" title="Android"></span>
<span class="description">
Android开发<br>
不影响性能<br>
超小的运行时依赖
</span>
</p>
<p class="logos-list-item">
<span class="logo _tomcat" title="Tomcat"></span>
<span class="description">
服务器端程序<br>
与JVM框架百分百兼容, 用什么服务器请随意
</span>
</p>
<p class="logos-list-item">
<span class="logo _js" title="JavaScript"></span>
<span class="description">
JavaScript. 用Kotlin写的代码可以生成JavaScript运行于Node.js或者浏览器中
</span>
</p>
<p class="logos-list-item">
<span class="logo _javaee" title="JavaEE"></span>
<span class="description">
企业版. 使用Kotlin进行任何类型的企业级应用程序Java EE开发.
</span>
</p>
<p class="logos-list-item">
<span class="logo _html5" title="HTML5"></span>
<span class="description">
Web. 无论是强类型的HTML与CSS开发亦或纯web开发
</span>
</p>
</div>
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data-popup-id="kotlin-feature_versatile"></div>
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<h3 id="java">与Java无缝交互<a href="#java" class="anchor"></a></h3>
<p>随意使用Java代码</p>
<pre><code class="code-block _highlighted lang_kotlin"><span class="k">import</span> <span class="nn">io.netty.channel.ChannelInboundMessageHandlerAdapter</span>
<span class="k">import</span> <span class="nn">io.netty.channel.ChannelHandlerContext</span>
<span class="k">public</span> <span class="k">class</span> <span class="nc">NettyHandler</span><span class="p">:</span> <span class="n">ChannelInboundMessageHandlerAdapter</span><span class="p"><</span><span class="n">Any</span><span class="p">>()</span> <span class="p">{</span>
<span class="k">public</span> <span class="k">override</span> <span class="k">fun</span> <span class="nf">messageReceived</span><span class="p">(</span><span class="n">p0</span><span class="p">:</span> <span class="n">ChannelHandlerContext</span><span class="p">?,</span> <span class="n">p1</span><span class="p">:</span> <span class="n">Any</span><span class="p">?)</span> <span class="p">{</span>
<span class="k">throw</span> <span class="n">UnsupportedOperationException</span><span class="p">()</span>
<span class="p">}</span>
<span class="p">}</span></code></pre>
<p>或者在JVM上使用已有Java库, 百分百兼容, 包括SAM支持</p>
<p>无论是JVM还是JavaScript, 用Kotlin写代码, 然后部署到你想要的地方.</p>
<pre><code class="code-block _highlighted lang_kotlin"><span class="k">import</span> <span class="nn">js.dom.html.*</span>
<span class="k">fun</span> <span class="nf">onLoad</span><span class="p">()</span> <span class="p">{</span>
<span class="n">window</span><span class="p">.</span><span class="n">document</span><span class="p">.</span><span class="n">body</span><span class="p">.</span><span class="n">innerHTML</span> <span class="p">+=</span> <span class="s">"<br/>Hello, Kotlin!"</span>
<span class="p">}</span></code></pre>
</div>
<div class="popup-close-button js-popup-close-button"
data-popup-id="kotlin-feature_interoperable"></div>
</div>
<div class="overview-popup-overlay"></div>
<div class="overview-popup overview-popup_tooling _hidden js-popup"
id="kotlin-feature_tooling">
<div class="popup-content">
<h3 id="section">工具化<a href="#section" class="anchor"></a></h3>
<p>一门语言需要工具化, 而在JetBrains, 这正是我们做得最好的地方!</p>
<p class="image-block"><img src="assets/images/index/features/tooling/tooling1.png" alt="Tooling" /></p>
<p class="image-block"><img src="assets/images/index/features/tooling/tooling2.png" alt="Tooling" /></p>
</div>
<div class="popup-close-button js-popup-close-button"
data-popup-id="kotlin-feature_tooling"></div>
</div>
<div class="overview-popup-overlay"></div>
</section>
<section class="kotlin-overview-section _code-examples">
<div class="kotlin-overview-code-example-tabs">
<div class="g-layout">
<div class="tab is_active js-tab" data-tab-id="kotlin-code-example-simplest"><div class="text">最简版</div></div>
<div class="tab js-tab" data-tab-id="kotlin-code-example-name-reading"><div class="tab-text">读名字</div></div>
<div class="tab js-tab" data-tab-id="kotlin-code-example-object-oriented"><div class="tab-text">">"面向对象"式Hello</div></div>
</div>
</div>
<h2 class="section-header">Kotlin看起来是什么样的？</h2>
<p class="section-description">简洁，简单，并且非常容易阅读（以及写）</p>
<div class="section-content">
<!-- code example -->
<div class="kotlin-overview-code-example" id="kotlin-code-example-simplest">
<div class="code-line">
<div class="code"><span class="keyword">package</span> hello
</div>
<div class="code-legend align_right">
<div class="code-legend-line"></div>
<div class="code-legend-text">
非必须的包头
</div>
</div>
</div>
<div class="code-line">
<div class="code"><span class="keyword">fun</span> <span class="func-name">main</span>(<span class="var-name">args</span>: Array<String>) {</div>
<div class="code-legend align_right">
<div class="code-legend-line"></div>
<div class="code-legend-text">
包级别可见的函数，返回Unit，接收一个String数组作为参数
</div>
</div>
</div>
<div class="code-line">
<div class="code"> <span class="buildin-func-name">println</span>(<span class="string-literal">"Hello World!"</span>)
}
</div>
<div class="code-legend align_right">
<div class="code-legend-line-marker"></div>
<div class="code-legend-line" style="
-webkit-transform: rotate(29deg);
-ms-transform: rotate(29deg);
transform: rotate(29deg);
top: 70px;
left: 23px;
right: -12px;
"></div>
<div class="code-legend-text" style="top: 100px;">
注意到没?<br> 分号可以不写
</div>
</div>
</div>
</div>
<!--/ code example -->
<!-- code example -->
<div class="kotlin-overview-code-example is_hidden" id="kotlin-code-example-name-reading">
<div class="code-line"><div class="code"><span class="keyword">fun</span> <span class="func-name">main</span>(<span class="var-name">args</span>: Array<String>) {
<span class="keyword">if</span> (<span class="var-name">args</span>.size() == <span class="number">0</span>) {
println(<span class="string-literal">"Provide a name"</span>)
<span class="keyword">return</span>
}</div></div>
<div class="code-line">
<div class="code"> println(<span class="string-literal">"Hello, <span class="string-literal-var-substitution">${</span><span class="var-name">args</span><span class="generic-code">[</span><span class="number">0</span><span class="generic-code">]<span class="string-literal-var-substitution">}</span></span><span class="string-literal-var-substitution"></span>!"</span>)
</div>
<div class="code-legend align_right">
<div class="code-legend-line"></div>
<div class="code-legend-text">
String内嵌，以缩减String处理流程
</div>
</div>
</div>
<div class="code-line">
<div class="code">}</div>
</div>
</div>
<!--/ code example -->
<!-- code example -->
<div class="kotlin-overview-code-example is_hidden" id="kotlin-code-example-object-oriented" style="left: 50px; max-width: 700px;">
<div class="code-line">
<div class="code"><span class="keyword">class</span> <span class="class-name">Greeter</span>(<span class="keyword">val</span> <span class="var-name">name</span>: String) {</div>
<div class="code-legend align_left">
<div class="code-legend-line"></div>
<div class="code-legend-text">
包含一个私有构造与一个成员函数的类
</div>
</div>
</div>
<div class="code-line">
<div class="code"> <span class="keyword">fun</span> <span class="func-name">greet</span>() {
<span class="buildin-func-name">println</span>(<span class="string-literal">"Hello, <span class="string-literal-var-substitution">$<span class="var-name">name</span></span>"</span>)
}
}
</div>
</div>
<div class="code-line">
<div class="code"><span class="keyword">fun</span> <span class="func-name">main</span>(<span class="var-name">args</span>: Array<String>) {
<span class="class-name"> Greeter</span>(<span class="var-name">args</span>[<span class="number">0</span>]).greet()</div>
</div>
<div class="code-line">
<div class="code">} </div>
<div class="code-legend align_right">
<div class="code-legend-line">
<div style="
position: absolute;
width: 1px;
background: #fff;
bottom: 1px;
height: 17px;
"></div>
</div>
<div class="code-legend-text">
创建一个实例的时候，无需new关键字
</div>
</div>
</div>
<div class="code-line">
<div class="code">
</div>
</div>
</div>
<!--/ code example -->
<div class="more-link-wrap">
<a href="/kotlin-web-site-cn/docs/reference/" class="more-link">更多示例请参考语言文档</a>
</div>
</div>
</section>
<section class="kotlin-overview-section _video-overview">
<div class="section-content">
<div class="video-player-wrap js-video-player-wrap">
<a href="http://www.youtube.com/watch?v=viiDaLpPfN4" class="video-thumb-link js-video-thumb-link">
<span class="video-description">
<span class="title">观看Kotlin实际使用</span>
<span class="description"></span>
</span>
<span class="video-player-play-button js-play-video-button"></span>
<span class="video-thumb-cover"></span>
<img src="/kotlin-web-site-cn/assets/images/index/how-to-use-kotlin-video-thumb.jpg"
class="video-thumb"
alt="Getting Started with Kotlin in 2 minutes"
height="506"
>
</a>
<div class="js-video-player">
</div>
</div>
</div>
</section>
<section class="kotlin-overview-section _get-kotlin" id="get-kotlin">
<h2 class="section-header">试用Kotlin</h2>
<p class="kotlin-version">1.0.0</p>
<div class="section-content">
<div class="get-kotlin-options-list">
<div class="option-item _standalone-compiler">
<div class="option-image _standalone-compiler"></div>
<div class="option-title-pre-text">独立</div>
<h3 class="option-title">编译器</h3>
<p class="option-description">
使用命令行或者Ant，Gradle，Maven这样的编译工具来编译代码
</p>
<div class="option-link-wrap">
<a href="/kotlin-web-site-cn/docs/tutorials/command-line.html"
class="option-link">下载编译器</a>
</div>
</div>
<div class="option-item _intellij-idea">
<div class="option-image">
<div class="jetbrains-logo _logo-intellij-idea _size-2"></div>
</div>
<div class="option-title-pre-text">使用</div>
<h3 class="option-title">IntelliJ IDEA</h3>
<p class="option-description">
Kotlin可以在免费社区版，旗舰版或者Android Studio中使用.
</p>
<div class="option-link-wrap">
<a href="/kotlin-web-site-cn/docs/tutorials/getting-started.html"
class="option-link">
设置插件
</a>
</div>
</div>
<div class="option-item _source-code">
<div class="option-image _source-code"></div>
<div class="option-title-pre-text">Use</div>
<h3 class="option-title">Eclipse</h3>
<p class="option-description">
获取Eclipse Luna的Kotlin插件预览版
</p>
<div class="option-link-wrap">
<a href="/kotlin-web-site-cn/docs/tutorials/getting-started-eclipse.html"
class="option-link">
设置插件
</a>
</div>
</div>
<div class="option-item _try-online">
<div class="option-image _try-online"></div>
<div class="option-title-pre-text">In the browser</div>
<h3 class="option-title">Try Online</h3>
<p class="option-description">
探索Kotlin示例代码，在浏览器中直接解决问题
</p>
<div class="option-link-wrap">
<a href="http://try.kotlinlang.org"
class="option-link">
在线试用
</a>
</div>
</div>
</div>
<div class="overview-popup _hidden js-popup"
id="setting-up-idea-option-popup">
<div class="popup-content">
<h3>Setting Up IntelliJ IDEA</h3>
<h4>Milestone Versions</h4>
<p>
A stable milestone version of Kotlin can be obtained from JetBrains <a href="#">Plugin Repository</a>.
<br>
In IDEA navigate to: Settings -> Plugins -> Browse Repositories
<br>
Select the Kotlin plugin and then Download and Install.
</p>
<h4>Using the Kotlin Nightly Builds</h4>
<p>In IDEA navigate to: Preferences -> Plugins -> Browse Repositories. Enter:</p>
<ul>
<li>
for IntelliJ IDEA 13 EAP:<br>
<small>http://teamcity.jetbrains.com/guestAuth/repository/download/bt345/.lastSuccessful/updatePlugins.xml</small>
</li>
<li>
for IntelliJ IDEA 12.1.5: <br>
<small>http://teamcity.jetbrains.com/guestAuth/repository/download/bt345/.lastSuccessful/updatePlugins.xml?branch=idea12</small>
</li>
<li>
for IntelliJ IDEA 12.1.4 and below: download manually, see instructions below.
</li>
</ul>
<p>Then you should be able to select the Kotlin plugin and Download and Install. The repository above contains nightly builds published automatically.</p>
</div>
<div class="popup-close-button js-popup-close-button"
data-popup-id="setting-up-idea-option-popup"></div>
</div>
</div>
</section>
<section class="kotlin-overview-section _testimonials">
<div class="section-header">谁在使用Kotlin</div>
<div class="section-content">
<div class="g-layout2 testimonials-carousel-wrap" id="testimonials-carousel-wrap">
<div class="testimonials-carousel js-carousel">
<ul class="testimonials-list js-carousel-list">
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">IntelliJ IDEA plugins, YouTrack vNext, CRM apps, new products etc.</div>
</blockquote>
<div class="testimonial-company">
<a href="http://www.jetbrains.com/"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
JetBrains
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Using Kotlin for the Front-End Web</div>
</blockquote>
<div class="testimonial-company">
<a href="http://hive.geosystems.aero/?locale=en"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
Industrial Geodetic Systems
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Kotlin in backend, data processing and service development</div>
</blockquote>
<div class="testimonial-company">
<a href="http://prezi.com"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
Prezi.com
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Using Kotlin in data processing pipeline, ElasticSearch plugins, and IDE plugins</div>
</blockquote>
<div class="testimonial-company">
<a href="http://linkedin.com/company/bremeld"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
Bremeld Corp SA
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Medication Control - Android Application</div>
</blockquote>
<div class="testimonial-company">
<a href="https://play.google.com/store/apps/details?id=ru.evilbloodydemon.pills"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
Igor Fomin
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Data schema compiler for TL language implemented in Kotlin</div>
</blockquote>
<div class="testimonial-company">
<a href="https://github.com/ex3ndr/telegram-tl"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
Telegram
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Facebook Game with over 10K users daily. Written in Java and all new code in Kotlin</div>
</blockquote>
<div class="testimonial-company">
<a href="https://www.facebook.com/wrestler.unstoppable"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
Wrestler.Unstoppable
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Android Application used internally</div>
</blockquote>
<div class="testimonial-company">
Plastoria
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Android Application. Using Kotlin since M2</div>
</blockquote>
<div class="testimonial-company">
<a href="http://duofm.bitbucket.org"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
Uncopt LLC
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Using Kotlin to build a new Vertical Product with team of five</div>
</blockquote>
<div class="testimonial-company">
<a href="http://gmc.net"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
GMC
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">True Fool. A Durak card game for Android written in Kotlin and libGDX</div>
</blockquote>
<div class="testimonial-company">
<a href="https://play.google.com/store/apps/details?id=truefool.android"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
JackOfHearts
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Android news application with 96.6% code written in Kotlin</div>
</blockquote>
<div class="testimonial-company">
<a href="https://play.google.com/store/apps/details?id=se.omni"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
Schibsted Tech Polska (Omni)
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Most new non-UI code written in Kotlin</div>
</blockquote>
<div class="testimonial-company">
<a href="https://play.google.com/store/apps/details?id=com.levelmoney.mobile"
class="testimonial-company-link"
target="_blank"
rel="nofollow">
Level Money
</a>
</div>
</li>
<li class="testimonials-list-item">
<blockquote class="testimonial-quote">
<div class="text">Fuzzy app/contact search and new UI written in Kotlin</div>
</blockquote>
<div class="testimonial-company">
<a href="https://play.google.com/store/apps/details?id=name.pilgr.appdialer"
class="testimonial-company-link"