Kotlin:遍历对象的组成部分 [英] Kotlin: Iterate over components of object

问题描述

每个数据类对象都有每个属性的组件，例如component1，component2等. 我想知道Kotlin中是否有任何方法可以迭代类的每个组件. 说我上课:

Each data class object has a component for each property like component1, component2, etc.. I was wondering if there is any way in Kotlin to iterate over each component of a class. Say I have class:

class User(age:Int, name:String)

我能做些什么吗?

for(component in aUserObject){
    //do some stuff with age or name
}

?

推荐答案

首先，componentN属性仅适用于数据类，而不适用于每个对象.

First of all, the componentN properties are available only on data classes, not on every object.

没有专门用于遍历组件的API，但是您可以使用

There is no API specifically for iterating over the components, but you can use the Kotlin reflection to iterate over properties of any class:

class User(val age: Int, val name: String)

fun main(args: Array<String>) {
    val user = User(25, "Bob")
    for (prop in User::class.memberProperties) {
        println("${prop.name} = ${prop.get(user)}")
    }  
}

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