MasoudFallahpour

public final class User {
   // $FF: synthetic field
   static final KProperty[] $$delegatedProperties = new KProperty[]{(KProperty)Reflection.mutableProperty1(new MutablePropertyReference1Impl(User.class, "firstName", "getFirstName()Ljava/lang/String;", 0)), (KProperty)Reflection.mutableProperty1(new MutablePropertyReference1Impl(User.class, "lastName", "getLastName()Ljava/lang/String;", 0))};
   @NotNull
   private final Delegate firstName$delegate = new Delegate();
   @NotNull
   private final Delegate lastName$delegate = new Delegate();

   @NotNull
   public final String getFirstName() {

MasoudFallahpour

class User {
    var firstName: String by Delegate()
    var lastName: String by Delegate()
}

fun main() {
    val user = User().apply {
        firstName = "John"
        lastName = "Doe"
    }

MasoudFallahpour

import kotlin.reflect.KProperty

class Delegate {

    private var value: String = ""

    operator fun getValue(thisRef: Any?, property: KProperty<*>): String {
        println("${property.name} is read")
        return value
    }

MasoudFallahpour

fun main() {
    val user = User().apply {
        println("firstName is written")
        firstName = "John"
        println("lastName is written")
        lastName = "Doe"
    }
    println("firstName is read")
    val firstName = user.firstName
    println("lastName is read")

MasoudFallahpour

fun main() {
    val user = User().apply {
        firstName = "John"
        lastName = "Doe"
    }
    val firstName = user.firstName
    val lastName = user.lastName
}

MasoudFallahpour

class User {
    var firstName: String = ""
    var lastName: String = ""
}

MasoudFallahpour

public final class WordProcessor implements Software {
   // $FF: synthetic field
   private final Software $$delegate_0;

   public WordProcessor(@NotNull Software software) {
      Intrinsics.checkNotNullParameter(software, "software");
      super();
      this.$$delegate_0 = software;
   }

MasoudFallahpour

class WordProcessor(software: Software) : Software by software

MasoudFallahpour

class WordProcessor(private val software: Software) : Software {
    override fun getLicense(): String = software.getLicense()
}

MasoudFallahpour

class ProprietarySoftware : Software {
    override fun getLicense() = "Some Proprietary Software License"
}

class FreeSoftware : Software {
    override fun getLicense() = "Some Free Software License"
}