A modern programming
language that makes
developers happier.
Developed by JetBrains & Open-source Contributors
Try out the latest Kotlin features before they are released
fun main() { println("Hello World") }
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Drastically reduce the amount of boilerplate code
/*
Create a POJO with getters, setters, `equals()`, `hashCode()`, `toString()` and `copy()` in a single line:
*/
data class Customer(val name: String, val email: String, val company: String)
// Or filter a list using a lambda expression:
val positiveNumbers = list.filter { it > 0 }
// Want a singleton? Create an object:
object ThisIsASingleton {
val companyName: String = "JetBrains"
}
Avoid entire classes of errors such as null pointer exceptions
/*
Get rid of those pesky NullPointerExceptions, you know, The Billion Dollar Mistake
*/
var output: String
output = null // Compilation error
// Kotlin protects you from mistakenly operating on nullable types
val name: String? = null // Nullable type
println(name.length()) // Compilation error
// And if you check a type is right, the compiler will auto-cast it for you
fun calculateTotal(obj: Any) {
if (obj is Invoice)
obj.calculateTotal()
}
Leverage existing libraries for the JVM, Android, and the browser
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// Target either the JVM or JavaScript. Write code in Kotlin and decide where you want to deploy to
import kotlin.browser.window
fun onLoad() {
window.document.body!!.innerHTML += "<br/>Hello, Kotlin!"
}
Choose any Java IDE or build from the command line
Bundled with both IntelliJ IDEA Community Edition and IntelliJ IDEA Ultimate
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Install the plugin from the Eclipse Marketplace
Use any editor and build from the command line
Build your first Kotlin app in your
favorite IDE