<Why Kotlin data classes can have nulls in non-nul...

# stackoverflow

[user]

Why Kotlin data classes can have nulls in non-nullable fields?
In Kotlin you can create a data class:

data class CountriesResponse(
val count: Int,
val countries: List,
val error: String)


Then you can use it to parse a JSON, for instance, "{n: 10}". In this case you will have an object val countries: CountriesResponse, received from Retrofit, Fuel or Gson, that contains these values: count = 0, countries = null, error = null.

In <a...