Kotlin data class copy method not deep copying all members

Question

Could someone explain how exactly the copy method for Kotlin data classes work? It seems like for some members, a (deep) copy is not actually created and the re

Answer 1

Beware of those answers who are just copying list reference from an old object into the new one. Only quick way of deep copying I have found is to either serialize/deserialize objects i.e. convert the objects into JSON and then transform them back to POJO. If you are using GSON, here is the piece of code:

class Foo {
    fun deepCopy() : Foo {
        return Gson().fromJson(Gson().toJson(this), this.javaClass)
    }
}