How to define interfaces in Dart?

Question

In Java, I might have an interface IsSilly and one or more concrete types that implement it:

public interfa         


        

Answer 1

abstract class ORMInterface {
  void fromJson(Map _map);
}

abstract class ORM implements ORMInterface {

  String collection = 'default';

  first(Map _map2) {
    print("Col $collection");
  }
}

class Person extends ORM {

  String collection = 'persons';

  fromJson(Map _map) {
    print("Here is mandatory");
  }
}