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<!DOCTYPE html><html><head><script async="true" src="https://www.googletagmanager.com/gtag/js?id=UA-127781126-2"></script><script>window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'UA-127781126-2');window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'UA-127781126-2');</script><script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script><script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script><script src="js/highlight.9.16.2.js"></script><script src="js/bootstrap.min.js"></script><script>hljs.initHighlightingOnLoad();</script><link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous"><link rel="stylesheet" href="css/style.css"><link rel="stylesheet" href="css/highlightjs-night-owl.css"><title>Kotlin vs Java</title><meta charset="utf-8"><meta name="viewport" content="width=device-width" initial-scale="1"></head><body><div class="container-fluid text-center top-title"><div class="row text-center"><div class="col"><p>Kotlin vs Java</p></div></div></div><nav class="navbar navbar-dark navbar-expand-lg"><button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"><span class="navbar-toggler-icon"></span></button><div id="navbarNav" class="collapse navbar-collapse"><ul class="navbar-nav"><li class="nav-item px-2 active"><a class="nav-link" href="/index.html">Basics</a><span class="sr-only"><current></current></span></li><li class="nav-item px-2"><a class="nav-link" href="/classes.html">Classes</a></li><li class="nav-item px-2"><a class="nav-link" href="/collections.html">Collections</a></li><li class="nav-item px-2"><a class="nav-link" href="/concurrency.html">Concurrency</a></li><li class="nav-item px-2"><a class="nav-link" href="/delegated-properties.html">Delegated Properties</a></li><li class="nav-item px-2"><a class="nav-link" href="/dsl.html">DSL</a></li><li class="nav-item px-2"><a class="nav-link" href="/functions.html">Functions</a></li><li class="nav-item px-2"><a class="nav-link" href="/scoping-functions.html">Scoping Functions</a></li><li class="nav-item px-2"><a class="nav-link" href="/spring-framework.html">Spring Framework</a></li></ul></div></nav><a class="github-corner" href="https://github.com/driver733/kotlin-vs-java" aria-label="View source on Github"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#70B7FD; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path class="octo-arm" d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;"></path><path class="octo-body" d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor"></path></svg><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style></a><div class="section"><div class="list-group-flush"><div class="list-group-item border-0"><div class="title">Hello world</div><div class="container-fluid"><div class="row"><div class="col"><div class="lang">Java</div><pre class="code"><code class="java">public static void main(final String[] args) {
System.out.println("Hello world!")
}</code></pre></div><div class="col"><div class="lang">Kotlin</div><pre class="code"><code class="kotlin">fun main() {
println("Hello world!")
}</code></pre></div></div></div></div><div class="list-group-item border-0"><div class="title">Variables I</div><div class="container-fluid"><div class="row"><div class="col"><div class="lang">Java</div><pre class="code"><code class="java">final int x;
final int y = 1;
</code></pre></div><div class="col"><div class="lang">Kotlin</div><pre class="code"><code class="kotlin">val x: Int
val y = 1
</code></pre></div></div></div></div><div class="list-group-item border-0"><div class="title">Variables II</div><div class="container-fluid"><div class="row"><div class="col"><div class="lang">Java</div><pre class="code"><code class="java">int w;
int z = 2;
z = 3;
w = 1;
</code></pre></div><div class="col"><div class="lang">Kotlin</div><pre class="code"><code class="kotlin">var w: Int
var z = 2
z = 3
w = 1
</code></pre></div></div></div></div><div class="list-group-item border-0"><div class="title">Null I</div><div class="container-fluid"><div class="row"><div class="col"><div class="lang">Java</div><pre class="code"><code class="java">final String name = null;
String lastName;
lastName = null
</code></pre></div><div class="col"><div class="lang">Kotlin</div><pre class="code"><code class="kotlin">val name: String? = null
var lastName: String?
lastName = null
var firstName: String
firstName = null // Compilation error!!
</code></pre></div></div></div></div><div class="list-group-item border-0"><div class="title">Null II</div><div class="container-fluid"><div class="row"><div class="col"><div class="lang">Java</div><pre class="code"><code class="java">if (
bob != null
&& bob.department != null
&& bob.department.text != null
) {
int length = bob.department.text.length();
}
</code></pre></div><div class="col"><div class="lang">Kotlin</div><pre class="code"><code class="kotlin">val length = bob?.department?.text?.length
val length = text!!.length // NullPointerException if text == null
</code></pre></div></div></div></div><div class="list-group-item border-0"><div class="title">Elvis operator</div><div class="container-fluid"><div class="row"><div class="col"><div class="lang">Java</div><pre class="code"><code class="java">if (nullableVariable != null) {
boolean success = nullableVariable.someMethodCall()
if (success) {
return success
} else {
return fallbackIfNullMethodCall()
}
} else {
return fallbackIfNullMethodCall()
}</code></pre></div><div class="col"><div class="lang">Kotlin</div><pre class="code"><code class="kotlin">val result = nullableVariable?.someMethodCall() ?: fallbackIfNullMethodCall()</code></pre></div></div></div></div><div class="list-group-item border-0"><div class="title">Strings I</div><div class="container-fluid"><div class="row"><div class="col"><div class="lang">Java</div><pre class="code"><code class="java">String name = "John";
String lastName = "Smith";
String text = "My name is: " + name + " " + lastName;
String otherText = "My name is: " + name.substring(2);
</code></pre></div><div class="col"><div class="lang">Kotlin</div><pre class="code"><code class="kotlin">val name = "John"
val lastName = "Smith"
val text = "My name is: $name $lastName"
val otherText = "My name is: ${name.substring(2)}"
</code></pre></div></div></div></div><div class="list-group-item border-0"><div class="title">Strings II</div><div class="container-fluid"><div class="row"><div class="col"><div class="lang">Java</div><pre class="code"><code class="java">String text = "First Line\n" +
"Second Line\n" +
"Third Line";
</code></pre></div><div class="col"><div class="lang">Kotlin</div><pre class="code"><code class="kotlin">val text = """
|First Line
|Second Line
|Third Line
""".trimMargin()
</code></pre></div></div></div></div><div class="list-group-item border-0"><div class="title">Ternary operator</div><div class="container-fluid"><div class="row"><div class="col"><div class="lang">Java</div><pre class="code"><code class="java">String text = x > 5 ? "x > 5" : "x <= 5";
</code></pre></div><div class="col"><div class="lang">Kotlin</div><pre class="code"><code class="kotlin">val text = if (x > 5) "x > 5" else "x <= 5"
</code></pre></div></div></div></div></div></div><footer><div class="container-fluid text-center"><div class="row pt-4 pb-1"><div class="col"><span>Created by: <a href="https://www.driver733.com">@driver733</a></span></div></div><div class="row pb-4 pt-1"><div class="col"><span>Based on: </span><a href="https://github.com/fabiomsr/from-java-to-kotlin">fabiomsr/from-java-to-kotlin</a></div></div></div></footer></body></html>