在Kotlin中有几种初始化数组的方法:

劳动力素质():

var myarray = arrayOf(1,2,3,4,5)

劳动力素质():

var myarray = arrayOf<Int>(1,2,3,4,5)

使用Array构造函数:

val num = Array(3, {i-> i*1})

内置的工厂方法:

val num1 = intArrayOf(1, 2, 3, 4)
//For Byte Datatype
val num2 = byteArrayOf()
//For Character Datatype
val num3 = charArrayOf()
//For short Datatype
val num4 = shortArrayOf()
//For long
val num5 = longArrayOf()

我想知道为什么没有人给出最简单的答案:

val array: Array<Int> = [1, 2, 3]

根据对我最初答案的一个评论，我意识到这只在注释参数中使用时才有效(这对我来说真的是出乎意料)。

看起来Kotlin不允许在注释之外创建数组文字。

例如，使用args4j库中的@Option查看以下代码:

    @Option(
        name = "-h",
        aliases = ["--help", "-?"],
        usage = "Show this help"
    )
    var help: Boolean = false

选项参数“aliases”的类型是Array<String>

你可以试试这个:

var a = Array<Int>(5){0}

I think one thing that is worth mentioning and isn't intuitive enough from the documentation is that, when you use a factory function to create an array and you specify it's size, the array is initialized with values that are equal to their index values. For example, in an array such as this: val array = Array(5, { i -> i }), the initial values assigned are [0,1,2,3,4] and not say, [0,0,0,0,0]. That is why from the documentation, val asc = Array(5, { i -> (i * i).toString() }) produces an answer of ["0", "1", "4", "9", "16"]

值得一提的是，当使用kotlin内置程序(例如intArrayOf()， longArrayOf()， arrayOf()等)时，对于给定的大小，您不能使用默认值(或所有值为所需值)初始化数组，相反，您需要通过根据类构造函数调用来进行初始化。

// Array of integers of a size of N
val arr = IntArray(N)

// Array of integers of a size of N initialized with a default value of 2
val arr = IntArray(N) { i -> 2 }

你可以这样做:

val numbers = intArrayOf(10, 20, 30, 40, 50)

or

val numbers = arrayOf<Int>(10, 20, 30, 40, 50)

also

val numbers = arrayOf(10, 20, 30, 40, 50)