About gc

Any class does not finalize().
When the object is how to deal with recycling.

If I understood you correct, you’re asking how to override finalize method, given that Any object does not define it.

All you need to do is simply declare it, without using the override keyword:

class C {
  protected fun finalize() {
    // finalization logic

More on this in the reference: https://kotlinlang.org/docs/reference/java-interop.html#object-methods