北京上课了讲师指出，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:
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
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!"
} |
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