Kotlin真的会取代JAVA吗？

自从Kotlin 成为 Android 开发一级语言，Kotlin确实以其实用，高效赢得了海外很多公司和开发者的认可，比如Square的Jake大神一直在推Kotlin。Kotlin在国外至少有将近2年的应用生产环境的实践(非JetBrains内部实践应用)。在移动开发中，相比iOS程序员，Android程序员总是很幸运，因为我们有很多优秀好用的工具（Android Studio等），选用Kotlin，则是Google 为开发者提供高效的开发工具的一贯作风。先来晒一晒Kotlin的几大特点：

Kotlin是静态类型编程语言，用于现代多平台应用，100％可与Java™和Android™互操作 [java] view plain copy

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:

立即学习“Java免费学习笔记（深入）”；

val positiveNumbers = list.filter { it > 0 }
Want a singleton? Create an object:

object ThisIsASingleton {
val companyName: String = "JetBrains"
}

[java] view plain copy

Kotlin 很安全

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

Ai好记

强大的AI音视频转录与总结工具

311

查看详情

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()
}

[java] view plain copy

方便使用兼容JVM上现有library

Use any existing library on the JVM, as there’s 100% compatibility, including SAM support.

import io.reactivex.Flowable
import io.reactivex.schedulers.Schedulers

Flowable
.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 to

import kotlin.browser.window

fun onLoad() {
window.document.body!!.innerHTML += "
Hello, Kotlin!"
}