val ints: Array<Int> = arrayOf(1, 2, 3) val any = Array<Any>(3) { "" } copy(ints, any)//!!!错误,需要Array<Any>类型,但是传入的是Array<Int>类型 } 上面的代码又复现了经典的问题,即泛型类型是不变因子,即Array<Int>不是Array<Any>的子类,为什么要这么限制?道理和上面一样,kotlin认为...
// 方式1:使用arrayOf创建1个数组:[1,2,3]val a=arrayOf(1,2,3)// 方式2:使用工厂函数创建1个数组[0,2,4]val b=Array(3,{i->(i*2)})// 工厂函数源码分析// 参数1 = 数组长度,花括号内是一个初始化值的代码块,给出数组下标 & 初始化值publicinlineconstructor(size:Int,init:(Int)->T)/...
Array 和 IntArray 的区别: Array 相当于引用类型数组 Integer[],IntArray 相当于数值类型数组 int[]。 Unit: Any 的子类,作为函数返回值时表示没有返回值,可以省略,与 Java void 类似。 Nothing: 表示表达式或者函数永远不会返回,Nothing? 唯一允许的值是 null。 Java Void: void 的包装类,与 void 类似表示...
IntArray,FloatArray,其他:基本类型数组,被编译成int[],float[],其他 Array:非空对象数组 Array:可空对象数组 使用这三种类型来声明数组,可以发现它们之间的区别: Kotlin声明的数组 等同的Java代码: 等同Java声明的数组 后面两种方法都对基本类型做了装箱处理,产生了额外的开销。 所以当需要声明非空的基本类型数组时...
fun monitorNetworkTraffic(port: Int) { val socket = DatagramSocket(port) val buffer = ByteArray(2048) while (true) { val packet = DatagramPacket(buffer, buffer.size) socket.receive(packet) val data = String(packet.data, 0, packet.length) ...
*/fun main(args:Array<String>) {//定义一个listvallist = listOf(1,3,4,5,6,7,43,63)//再定义一个arrayListvalnewList =ArrayList<Int>()//一个集合的映射list.forEach{valnewElement = it *2+3newList.add(newElement) } newList.forEach(::println) ...
Recovery of symbolic derivatives from AD Additionally, it aims to support: PyTorch-style define-by-run semantics N-dimensional tensors and higher-order tensor operators Fully-general AD over control flow, variable reassignment (via delegation), and array programming, possibly using a typed IR such ...
kotlin.UByteArray: an array of unsigned bytes kotlin.UShortArray: an array of unsigned shorts kotlin.UIntArray: an array of unsigned ints kotlin.ULongArray: an array of unsigned longs To iterate through a range of unsigned values there will be range and progression types of unsigned ints and...
Running this query on old Java code, before version 5, often returns many false positive results arising from uses of the method Collection.toArray(T[]), which converts a collection into an array of type T[]. In code that does not use generics, this method is often used in the followi...
=nullvarcategories: Array<String>? =nullvarxAxisGridLineWidth:Int? =nullvarxAxisVisible:Boolean? =nullvaryAxisVisible:Boolean? =nullvaryAxisLabelsEnabled:Boolean? =nullvaryAxisTitle: String? =nullvaryAxisLineWidth:Float? =nullvaryAxisGridLineWidth:Int? =nullvarcolorsTheme: Array<Any>? =nullvarlege...