Why Kotlin?

Kotlin是什么：

静态类型编程语言

用于现代多平台应用

100％可与Java™和Android™互操作

#Kotlin是非常简介的编程语言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"}

#Kotlin 很安全Get rid of those pesky NullPointerExceptions, you know, The Billion Dollar Mistakevar output: Stringoutput = null   // Compilation errorKotlin protects you from mistakenly operating on nullable typesval name: String? = null    // Nullable typeprintln(name.length())      // Compilation errorAnd if you check a type is right, the compiler will auto-cast it for youfun calculateTotal(obj: Any) {    if (obj is Invoice)        obj.calculateTotal()}

#方便使用 兼容JVM上现有libraryUse any existing library on the JVM, as there’s 100% compatibility, including SAM support.import io.reactivex.Flowableimport io.reactivex.schedulers.SchedulersFlowable    .fromCallable {        Thread.sleep(1000) //  imitate expensive computation        "Done"    }    .subscribeOn(Schedulers.io())    .observeOn(Schedulers.single())    .subscribe(::println, Throwable::printStackTrace)Target either the JVM or JavaScript. Write code in Kotlin and decide where you want to deploy toimport kotlin.browser.windowfun onLoad() {    window.document.body!!.innerHTML += "<br/>Hello, Kotlin!"}

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您接触过Kotlin吗？

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