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<!DOCTYPE html>
<html>
<head>
<title>Kotlin 语言中文站</title>
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<div class="global-layout">
<header class="global-header">
<div class="global-header-panel">
<div class="g-layout">
<a class="global-header-logo" href="/">Kotlin</a>
<nav class="global-nav">
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<a href="https://www.kotliner.cn/" class="nav-item">
博客
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社区
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<a href="https://twitter.com/kotlin" class="link link-twitter" title="Kotlin on Twitter" target="_blank">
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</a>
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</a>
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<div class="icon"></div>
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</nav> </div>
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<div class="g-layout">
<div class="kotlin-info">
<div class="kotlin-info-description">
用于现代多平台应用的<br>
静态编程语言
</div>
<div class="kotlin-info-description-extra" style="margin-bottom: 24px">
与 Java™ 和 Android™ 100% 可互操作
</div>
<a href="http://try.kotlinlang.org" class="get-kotlin-button">
试用 Kotlin
</a>
<span class="release-banner">
Kotlin 1.2 发布了
<a class="release-banner__link"
href="https://blog.jetbrains.com/kotlin/2017/11/kotlin-1-2-released/">
阅读更多</a>
</span>
<span class="release-banner">
慕课网：Kotlin系统入门与进阶教程 上线
<a class="release-banner__link"
href="http://coding.imooc.com/class/108.html">
阅读更多</a>
</span>
</div>
<div class="current-version">Version 1.2.41</div>
</div>
</header>
<section class="kotlin-overview-section _works-on">
<h2 class="section-header">构建用于以下平台的应用</h2>
<div class="works-on-list"> <a href="/docs/reference/server-overview.html" class="works-on-item">
<div class="works-on-icon _jvm"></div>
<div class="works-on-text">
JVM<br/>
</div>
</a>
<a href="/docs/reference/android-overview.html" class="works-on-item">
<div class="works-on-icon _android"></div>
<div class="works-on-text">
Android<br/>
</div>
</a>
<a href="/docs/reference/js-overview.html" class="works-on-item">
<div class="works-on-icon _浏览器"></div>
<div class="works-on-text">
浏览器<br/>
</div>
</a>
<a href="/docs/reference/native-overview.html" class="works-on-item">
<div class="works-on-icon _原生"></div>
<div class="works-on-text">
原生<br/>
</div>
</a>
</div>
</section>
<section class="kotlin-overview-section _features">
<h2 class="section-header">为什么选择 Kotlin？</h2>
<div class="section-content">
<ul class="kotlin-features-list">
<li class="kotlin-feature _简洁 js-popup-open-button"
data-popup-id="kotlin-feature_简洁">
<div class="feature-image">
<div class="feature-icon _简洁"></div>
</div>
<h3 class="feature-title">简洁</h3>
<p class="feature-description">大大减少样板代码的数量。</p>
<span class="feature-example-link">参见示例</span>
</li>
<li class="kotlin-feature _安全 js-popup-open-button"
data-popup-id="kotlin-feature_安全">
<div class="feature-image">
<div class="feature-icon _安全"></div>
</div>
<h3 class="feature-title">安全</h3>
<p class="feature-description">避免空指针异常等整个类的错误。</p>
<span class="feature-example-link">参见示例</span>
</li>
<li class="kotlin-feature _互操作性 js-popup-open-button"
data-popup-id="kotlin-feature_互操作性">
<div class="feature-image">
<div class="feature-icon _互操作性"></div>
</div>
<h3 class="feature-title">互操作性</h3>
<p class="feature-description">充分利用 JVM、Android 和浏览器的现有库。</p>
<span class="feature-example-link">参见示例</span>
</li>
<li class="kotlin-feature _工具友好 js-popup-open-button"
data-popup-id="kotlin-feature_工具友好">
<div class="feature-image">
<div class="feature-icon _工具友好"></div>
</div>
<h3 class="feature-title">工具友好</h3>
<p class="feature-description">可用任何 Java IDE 或者使用命令行构建。</p>
<span class="feature-example-link">参见示例</span>
</li>
</ul>
</div>
<div class="overview-popup overview-popup_简洁 _hidden js-popup"
id="kotlin-feature_简洁">
<div class="popup-content">
<h3 id="简洁">简洁</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> 以及 <code>copy()</code> 的 POJO：</p>
<pre><code class="code _highlighted" data-lang="text/x-kotlin">data class Customer(val name: String, val email: String, val company: String)
</code></pre>
<p>或者使用 lambda 表达式来过滤列表：</p>
<pre><code class="code _highlighted" data-lang="text/x-kotlin">val positiveNumbers = list.filter { it > 0 }
</code></pre>
<p>想要单例？创建一个 object 就可以了：</p>
<pre><code class="code _highlighted" data-lang="text/x-kotlin">object ThisIsASingleton {
val companyName: String = "JetBrains"
}
</code></pre>
</div>
<div class="popup-close-button js-popup-close-button"
data-popup-id="kotlin-feature_简洁"></div>
</div>
<div class="overview-popup-overlay"></div>
<div class="overview-popup overview-popup_安全 _hidden js-popup"
id="kotlin-feature_安全">
<div class="popup-content">
<h3 id="安全">安全</h3>
<p>彻底告别那些烦人的 NullPointerException——著名的<a href="http://www.infoq.com/presentations/Null-References-The-Billion-Dollar-Mistake-Tony-Hoare">十亿美金的错误</a>。</p>
<pre><code class="code _highlighted" data-lang="text/x-kotlin">var output: String
output = null // 编译错误
</code></pre>
<p>Kotlin 可以保护你避免对可空类型的误操作</p>
<pre><code class="code _highlighted" data-lang="text/x-kotlin">val name: String? = null // 可控类型
println(name.length()) // 编译错误
</code></pre>
<p>并且如果你检查类型是正确的，编译器会为你做自动类型转换</p>
<pre><code class="code _highlighted" data-lang="text/x-kotlin">fun calculateTotal(obj: Any) {
if (obj is Invoice)
obj.calculateTotal()
}
</code></pre>
</div>
<div class="popup-close-button js-popup-close-button"
data-popup-id="kotlin-feature_安全"></div>
</div>
<div class="overview-popup-overlay"></div>
<div class="overview-popup overview-popup_互操作性 _hidden js-popup"
id="kotlin-feature_互操作性">
<div class="popup-content">
<h3 id="互操作性">互操作性</h3>
<p>使用 JVM 上的任何现有库，因为有 100％ 的兼容性，包括 SAM 支持。</p>
<pre><code class="code _highlighted" data-lang="text/x-kotlin">import io.reactivex.Flowable
import io.reactivex.schedulers.Schedulers
Flowable
.fromCallable {
Thread.sleep(1000) // 模仿高开销的计算
"Done"
}
.subscribeOn(Schedulers.io())
.observeOn(Schedulers.single())
.subscribe(::println, Throwable::printStackTrace)
</code></pre>
<p>无论是 JVM 还是 JavaScript 目标平台，都可用 Kotlin 写代码然后部署到你想要的地方</p>
<pre><code class="code _highlighted" data-lang="text/x-kotlin">import kotlin.browser.window
fun onLoad() {
window.document.body!!.innerHTML += "<br/>Hello, Kotlin!"
}
</code></pre>
</div>
<div class="popup-close-button js-popup-close-button"
data-popup-id="kotlin-feature_互操作性"></div>
</div>
<div class="overview-popup-overlay"></div>
<div class="overview-popup overview-popup_工具友好 _hidden js-popup"
id="kotlin-feature_工具友好">
<div class="popup-content">
<h3 id="工具化">工具化</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 alt="Tooling" src="/assets/images/index/features/tooling/tooling1.png" srcset="/assets/images/index/features/tooling/tooling1%402x.png 2x"/></p>
<p class="image-block"><img alt="Tooling" src="/assets/images/index/features/tooling/tooling2.png" srcset="/assets/images/index/features/tooling/tooling2%402x.png 2x"/></p>
</div>
<div class="popup-close-button js-popup-close-button"
data-popup-id="kotlin-feature_工具友好"></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-object-oriented"><div class="tab-text">“面向对象”的 Hello</div></div>
<div class="tab js-tab" data-tab-id="kotlin-code-example-android-activity"><div class="tab-text">Android Activity</div></div>
<div class="tab js-tab" data-tab-id="kotlin-code-example-html-builder"><div class="tab-text">HTML 构建器</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、易读、易写</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">
可选的包头
</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">
包级可见的函数，接受一个字符串数组作为参数
</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;">
注意到了吗？<br> 分号可以省略
</div>
</div>
</div>
</div>
<!--/ code example -->
<!-- code example -->
<div class="kotlin-overview-code-example is_hidden" id="kotlin-code-example-object-oriented">
<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;
top: 1px;
height: 17px;
"></div>
</div>
<div class="code-legend-text">
具有主构造函数和成员函数的类
</div>
</div>
</div>
<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>
<div class="code-line">
<div class="code"> <span class="keyword">fun</span> <span class="func-name">greet</span>() { </div>
</div>
<div class="code-line">
<div class="code"><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 class="code-legend align_right">
<div class="code-legend-line">
</div>
<div class="code-legend-text">
字符串内插以减少模版代码。
</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>) {
<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">
请注意，创建一个对象不用 new 关键字
</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-android-activity">
<div class="code"> </div>
<div class="code-line">
<div class="code-legend align_right">
<div class="code-legend-line">
<div style="
position: absolute;
width: 1px;
background: #fff;
top: 1px;
height: 17px;
"></div>
</div>
<div class="code-legend-text">
类型安全访问视图
</div>
</div>
</div>
<div class="code-line">
<div class="code"><span class="keyword">import</span> kotlinx.android.synthetic.main.activity_main.fab
</div>
</div>
<div class="code-line">
<div class="code"><span class="keyword">class</span> <span class="class-name">MainActivity</span> : <span class="class-name">AppCompatActivity</span>() {</div>
</div>
<div class="code-line">
<div class="code"> <span class="keyword">override fun</span> <span class="func-name">onCreate</span>(<span class="var-name">savedInstanceState</span>: Bundle?) {
...</div>
</div>
<div class="code-line">
<div class="code"> fab.setOnClickListener {</div>
<div class="code-legend align_right">
<div class="code-legend-line">
</div>
<div class="code-legend-text">
Lambda 表达式以简化事件处理程序
</div>
</div>
</div>
<div class="code-line">
<div class="code"> toast(<span class="string-literal">"Hello!"</span>)</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">
用于普通 Android API 的简洁包装
</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-html-builder">
<div class="code-line">
<div class="code"><span class="keyword">val</span> <span class="var-name">data</span> = <span class="buildin-func-name">mapOf</span>(<span class="number">1</span> <span class="buildin-func-name">to</span> <span class="string-literal">"one"</span>, <span class="number">2</span> <span class="buildin-func-name">to</span> <span class="string-literal">"two"</span>)
createHTML().table {</div>
</div>
<div class="code-line">
<div class="code"> <span class="keyword">for</span> ((<span class="var-name">num</span>, <span class="var-name">string</span>) <span class="keyword">in</span> <span class="var-name">data</span>) {</div>
<div class="code-legend align_right">
<div class="code-legend-line">
</div>
<div class="code-legend-text">
遍历数据
</div>
</div>
</div>
<div class="code-line">
<div class="code"> tr {</div>
<div class="code-legend align_right">
<div class="code-legend-line">
</div>
<div class="code-legend-text">
创建 HTML 标签的函数
</div>
</div>
</div>
<div class="code-line">
<div class="code"> td { +<span class="string-literal">"$</span><span class="var-name">num</span><span class="string-literal">"</span> } </div>
</div>
<div class="code-line">
<div class="code"> td { +<span class="var-name">string</span> }
}
}
}
</div>
<div class="code-legend align_right">
<div class="code-legend-line">
</div>
<div class="code-legend-text">
输出变量的值
</div>
</div>
</div>
</div>
<!--/ code example -->
<div class="more-link-wrap">
<a href="/docs/reference" class="more-link">更多示例参见完整语言文档</a>
</div>
</div>
</section>
<section class="kotlin-overview-section _get-kotlin" id="get-kotlin">
<h2 class="section-header">试用 Kotlin</h2>
<div class="try-image"></div>
<a href="//try.kotlinlang.org" class="try-button">在线试用</a>
<div class="section-description">
浏览 Kotlin 代码示例<br/>
并直接在浏览器中解决问题
</div>
<div class="section-content">
<div class="get-kotlin-options-list">
<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">
IntelliJ IDEA 社区版或 IntelliJ IDEA Ultimate 中已自带
</p>
<div class="option-link-wrap">
<a href="/docs/tutorials/getting-started.html"
class="option-link">
使用说明
</a>
</div>
</div>
<div class="option-item">
<div class="option-image _android-studio"></div>
<div class="option-title-pre-text">使用</div>
<h3 class="option-title">Android Studio</h3>
<p class="option-description">
<a href="https://developer.android.com/studio/preview/index.html" target="_blank">Android Studio 3.0</a> 已自带，有插件可用于早期版本
</p>
<div class="option-link-wrap">
<a href="/docs/tutorials/kotlin-android.html"
class="option-link">
使用说明
</a>
</div>
</div>
<div class="option-item">
<div class="option-image _eclipse"></div>
<div class="option-title-pre-text">使用</div>
<h3 class="option-title">Eclipse</h3>
<p class="option-description">
从 Eclipse Marketplace 安装插件
</p>
<div class="option-link-wrap">
<a href="/docs/tutorials/getting-started-eclipse.html"
class="option-link">
使用说明
</a>
</div>
</div>
<div class="option-item _standalone-compiler">
<div class="option-image _standalone-compiler"></div>
<div class="option-title-pre-text">独立的</div>
<h3 class="option-title">编译器</h3>
<p class="option-description">
使用任何编辑器，并在命令行构建
</p>
<div class="option-link-wrap">
<a href="/docs/tutorials/command-line.html"
class="option-link">下载编译器</a>
</div>
</div>
</div>
<p class="kotlin-version">最新版本： 1.2.41</p>
</div>
</section>
<section class="kotlin-overview-section _testimonials">
<h2 class="section-header">Kotlin 用途集锦</h2>
<div class="testimonials-layout">
<div class="testimonials">
<div class="testimonial">
<h3 class="testimonial-header">Pinterest</h3>
<div class="testimonial-text">Pinterest 已成功<a href="https://www.youtube.com/watch?v=mDpnc45WwlI">将 Kotlin 引入</a>了他们的应用程序，每个月有 1 亿 5 千万人使用。</div>
</div>
<div class="testimonial">
<h3 class="testimonial-header">Gradle</h3>
<div class="testimonial-text">Gradle 正<a href="https://hltj.me/kotlin/2017/06/13/kotlin-meet-gradle.html">引入 Kotlin</a> 作为编写脚本的语言。</div>
</div>
<div class="testimonial">
<h3 class="testimonial-header">Evernote</h3>
<div class="testimonial-text">Evernote 最近 <a href="https://blog.evernote.com/tech/2017/01/26/android-state-library/">将 Kotlin 整合</a>到了他们的 Android 客户端</div>
</div>
<div class="testimonial">
<h3 class="testimonial-header">Uber</h3>
<div class="testimonial-text">Uber 团队<a href="https://www.reddit.com/r/androiddev/comments/5sihp0/2017_whos_using_kotlin/ddfmkf7/">使用 Kotlin</a> 来构建内部工具</div>
</div>
<div class="testimonial">
<h3 class="testimonial-header">Corda</h3>
<div class="testimonial-text">是一个开源分布式分类账号平台，由各大银行提供支持，<a href="https://www.corda.net/2017/01/10/kotlin/">完全由 Kotlin 构建</a>。</div>
</div>
<div class="testimonial">
<h3 class="testimonial-header">Coursera</h3>
<div class="testimonial-text">Coursera Android 应用程序<a href="https://building.coursera.org/blog/2016/03/16/becoming-bilingual-coursera/">部分用 Kotlin 编写</a></div>
</div>
<div class="testimonial">
<h3 class="testimonial-header">Pivotal</h3>
<div class="testimonial-text">Spring <a href="https://hltj.me/kotlin/2017/05/23/kotlin-support-in-spring5.html">采用 Kotlin 的语言特性</a>来提供更简洁的 API</div>
</div>
<div class="testimonial">
<h3 class="testimonial-header">Atlassian</h3>
<div class="testimonial-text"><a href="https://twitter.com/danlew42/status/809065097339564032">Trello Android</a>应用程序中的所有新代码都用 Kotlin。</div>
</div>
</div>
</div>
</section>
<section class="kotlin-overview-section _community">
<h2 class="section-header">保持联系</h2>
<div class="section-content">
<ul class="links-list">
<li class="links-list-item">
<a href="http://blog.jetbrains.com/kotlin" class="link" target="_blank">
<span class="link-icon _blog"></span>
<span class="link-text">博客</span>
</a>
</li>
<li class="links-list-item">
<a href="community.html" class="link">
<span class="link-icon _forum"></span>
<span class="link-text">社区</span>
</a>
</li>
<li class="links-list-item">
<a href="https://twitter.com/kotlin" class="link" target="_blank">
<span class="link-icon _twitter"></span>
<span class="link-text">Twitter</span>
</a>
</li>
<li class="links-list-item">
<a href="https://youtrack.jetbrains.com/issues/KT" class="link" target="_blank">
<span class="link-icon _issue-tracker">
<div class="jetbrains-logo _logo-youtrack _size-2"></div>
</span>
<span class="link-text">问题跟踪</span>
</a>
</li>
</ul>
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