在 Kotlin 中使用变量而不是真实的属性名称来描述属性

Question

There are a lot of similar questions, but I still can't find out right answer. In Jawa square brackets works i think, but in Kotlin?

data class source (
val npk : Int = 0,
val name : String = "",
val coa : String = ""
)

fun main() {
  var sourceList : MutableList<source> = mutableListOf(source(1, "Uno", "one"),
                                                       source(2, "Dues", "two"),
                                                       source(3, "Tres", "three"))
   sourceList.forEach { source -> println(source.name)} // haw to use variable instead "name"?
      val variable = "name"
 //  sourceList.forEach { source -> println(source.$variable)} Is there construction like this possible in KOTLIN?

Answer 1

Without code changes on your class it's only possible via reflection API. Not usually recommended as it can be slower, and is more error prone.

See this answer for an example on how reflection can be used to achieve that : https://stackoverflow.com/a/35539628/3801327

I'd recommend you to go with the solution that CommonsWare suggested in the comment ( adding get operator ) instead