Setter 没有在 Kotlin 中赋值

Question

我正在尝试做一个温度程序，它输出提供的三个城市的最低温度。如果三个城市之一的温度高于 + 57 或低于 -92，则所有三个城市都将设置默认值（莫斯科 +5，河内 +20，迪拜为 30）

但是，在 readLine 中提供这些数字 20,100,35 是行不通的。 这就是City 类的样子：

class City(val name: String) {
    var degrees: Int = 0
        set(value) {
            field =
            if (value > 57 || -92 > value) {
                when (this.name) {
                    "Dubai" -> 30
                    "Moscow" -> 5
                    "Hanoi" -> 20
                    else -> 0
                }

            } else {
                value
            }
        }}

我主要有：

val first = readLine()!!.toInt()
val second = readLine()!!.toInt()
val third = readLine()!!.toInt()
val firstCity = City("Dubai")
val secondCity = City("Moscow")
val thirdCity = City("Hanoi")
firstCity.degrees = first
secondCity.degrees = second
thirdCity.degrees = third

println(first)
println(second)
println(third)  

二传手有什么问题？为什么second 没有设置默认值？

Answer 1

按我的预期工作https://pl.kotl.in/otINdg8E3：

class City(val name: String) {
    var degrees: Int = 0
        set(value) {
            field =
            if (value > 57 || -92 > value) {
                when (this.name) {
                    "Dubai" -> 30
                    "Moscow" -> 5
                    "Hanoi" -> 20
                    else -> 0
                }

            } else {
                value
            }
        }}


fun main() {
    val firstCity = City("Dubai")
    val secondCity = City("Moscow")
    val thirdCity = City("Hanoi")
    firstCity.degrees = 100
    secondCity.degrees = -100
    thirdCity.degrees = 6

    println(firstCity.degrees)  // prints 30
    println(secondCity.degrees) // prints 5
    println(thirdCity.degrees)  // prints 6
}