Summary - Reflection

Combine KClass, KProperty and call to write a serialization framework.

Summary - Reflection

In this group you saw the reflection tools: class info with KClass, property access with KProperty, function info with KFunction, dynamic calling with call and metadata with annotations.

This lesson includes a small task that combines three of them: you will take a class's KClass reference and print its simpleName and members.size. This pattern brings together the foundation of reflection.

Exercise Summary: inspect Person KClass

Define class Person(val name: String, val age: Int). In main take val kc = Person::class and write first println(kc.simpleName), then println(kc.members.size).

Show example solution

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

fun main() {
    val kc = Person::class
    println(kc.simpleName)
    println(kc.members.size)
}

Test yourself

Which method calls a function at runtime?
- call
- let
- apply
- also
Show answer

call — call invokes a KFunction.
Match the reflection tools

KClass

Class info
KProperty

Property access
KFunction

Function info
annotations

Metadata

Complete the simpleName call

val kc = Person::class
println(kc.____)

Show answer

val kc = Person::class
println(kc.simpleName)

Next lesson: Mutex

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies