小编Ant*_*SPR的帖子

我不知道如何做到这一点，以便在创建对象时，参数的值“通过设置器”，我得到的最接近的是复制代码，在创建对象时使用一次，然后在二传手

class User(var name: String, password: String, age: Int) {

    // IDK how use a custom setter in the primary constructor
    var password: String = if (password.length > 6) password else throw  IllegalArgumentException("Password is too short")
        set(value) {
            if(value.length > 6)
                field = value
            else
                throw IllegalArgumentException("Password is too short")
        }

    var age: Int = if (age > 18) age else throw IllegalArgumentException("Age must be 18+")
        set(value) {
            if(value > 18 )
                field = value
            else
                throw IllegalArgumentException("Age must be …

我正在尝试在标题下方打印一行。这个想法是该行与标题的长度相同。我尝试了多种方法，我认为这是最接近的，但它给我的结果不正确。

fun main() {

    val chapters = arrayOf("Basic syntax", "Idioms", "Kotlin by example", "Coding conventions")

    for (numCharpter in chapters.indices){
        // Print the name of the chapter
        val title = "Charpter ${numCharpter + 1}: ${chapters[numCharpter]}"
        val arrayDash = Array(title.length) {'='}
        val stringDash = arrayDash.toString()


        println("$title\n$stringDash\n")

        // the rest of the code
    }
}

我想要的输出是：

Charpter 1: Basic syntax
========================

Charpter 2: Idioms
==================

Charpter 3: Kotlin by example
=============================

Charpter 4: Coding conventions
==============================

我得到的输出是：

Charpter 1: Basic syntax
[Ljava.lang.Character;@24d46ca6
Charpter …