Programming Kotlin

Objects and companions

We can even get a reference to objects or companion objects through reflection. For example, take the following definition of a class and a companion object:

    class Aircraft(name: String, manufacturer: String, capacity: Int)  { 
      companion object { 
        fun boeing(name: String, capacity: Int) = Aircraft(name,  "Boeing", capacity) 
      } 
    } 

Given this, we can retrieve a reference to the companion object using the appropriately named companionObject property defined on the KClass type:

    val kclass = Aircraft::class 
    val companionKClass = kclass.companionObject 

From then on, we have another KClass instance, this one modeling the functions and members of the companion object.

In fact, using the companionObjectInstance property, we can even get ...