What's Kotlin equivalent of Class<?>

I want a map between `Int` and any class. In Java it would be `Map<Class<?>, Integer>`. What's the Kotlin equivalent of that?

You're looking for KClass. You need to add the Kotlin reflection library in order to use it.

[`KClass`](

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) is Kotlin's equivalent to `java.lang.Class`.

An instance of `KClass` can be obtained with `::class` on either a type or a value (i.e. `String::class`, `3.8::class`).

If you require a Java `Class` instance from a `KClass` you can use the [`java` extension property](

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):

val kotlinClass: KClass<String> = String::class
val javaClass: Class<String> = String::class.java

Keep in mind that if you want to use kotlin-reflect's [full features](

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) you will need [`kotlin-reflect`](

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) on the classpath.

So in your case, the equivalent would be `Map<KClass<*>, Int>`.

The equivalent declaration would be `Map<Class<*>, Int>`.