First-class support for constant values and immutable collections (great for parallel and functional programming) Functions can be top-level elements (i.e., there is no need to put everything inside a class) Functions are first-class citizens: they can be passed around just like any other typ...
@1012 = internal unnamed_addr constant { %struct.ArrayHeader, [13 x i16] } { %struct.ArrayHeader { %struct.TypeInfo* bitcast ( i8* getelementptr (i8, i8* bitcast ({ %struct.TypeInfo, [3 x i8*] }* @"kclass:kotlin.String" to i8*), i32 1) to %struct.TypeInfo* ), i32 13...
class User(val id: Int, val name: String, val address: String) fun saveUser(user: User) { if (.isEmpty()) { throw IllegalArgumentException( "Can't save user ${user.id}: empty Name") } if (user.address.isEmpty()) { throw IllegalArgumentException( "Can't save user ${user.id}...
第一对是Pair<String, Int>,第二对是Pair<String, String>: var map = mapOf("Mount Everest" to 8848, "K2" to "4017") // Inferred type: Map<String, Any> 在前面的情景中,Kotlin 编译器将尝试为所有对推断出一个公共类型。两对中的第一个参数都是String(Mount Everest,K2),因此在这里自然会推断...
String Concatenation The+operator can be used between strings to add them together to make a new string. This is calledconcatenation: Example varfirstName="John"varlastName="Doe"println(firstName+" "+lastName) Try it Yourself » Note that we have added an empty text (" ") to create a...
{ FastServiceLoader.loadMainDispatcherFactory() } else { // 在Android上编译时,启动R8优化 ServiceLoader.load( MainDispatcherFactory::class.java, MainDispatcherFactory::class.java.classLoader ).iterator().asSequence().toList() } @Suppress("ConstantConditionIf") factories.maxByOrNull { it.load...
prefix: String = "[", postfix: String = "]" ): String { ... } // joinToString(list) 那么调用的时候如果默认参数值自己的满足要求,就可以只传入集合list即可。 4.顶层函数 不同于Java中函数只能定义在每个类里面,Kotlin采用了JavaScript 中的做法,可以在文件任意位置处定义函数,这种函数称为顶层函数。
Kotlin Constant How to Create Constants in Kotlin Kotlin JSON How to Parse JSON String to Object in Kotlin Kotlin MutableList How to Create an Empty Mutable List in Kotlin Kotlin Static Equivalent of Java Static Functions in Kotlin How to Create and Use Static Variables in Kotlin ...
import java.util.Collections class MyClass { companion object { const val MY_CONSTANT = "myConstant" fun myFunction() { // ... } } } fun main() { val list = Collections.emptyList<String>() MyClass.myFunction() } 复制代码 在这个例子中,我们导入了 java.util.Collections 类的静态成员,...
classTemp{suspendfunfetchData(argument:String):Boolean{valresult = netRequest(argument)returnresult ==0}// 模拟网络请求suspendfunnetRequest(argument:String):Int{ delay(1000)returnargument.length } } 这两个方法都使用了suspend关键字修饰,我们将这个文件的字节码反编译为等同效果的Java代码: ...