How to set values to data class if some size is specified in kotlin?

问题

I have a data class in kotlin like this:

data class myDataClass(val myArr: ArrayList<Char>)

Now, suppose I create an instance of it as follows:

val myData = myDataClass(x)    // x is an integer; 1 <= x <= 9

I want that myData should have the following data:

println(myData.myArr)
// [A, B, C, D, ...]

回答1:

It's possible:

data class myDataClass(val myArr: ArrayList<Char>) {
    constructor(i: Int) : this(ArrayList((0..i).map { ('A' + it).toChar() }))
}

But the truth is, it's a pretty strange code

来源：https://stackoverflow.com/questions/57514143/how-to-set-values-to-data-class-if-some-size-is-specified-in-kotlin