If you want to create a class A that supports class B’s API without inheriting B’s implementation, class A should implement the B interface. In Dart, every class defines an implicit interface as others say. So then… the key is: Classes should use the implements keyword to be able to use an interface.7 Mar 2021
Read moreCan an object have multiple interfaces?
An object can have multiple types: the type of its own class and the types of all the interfaces that the class implements . This means that if a variable is declared to be the type of an interface, then its value can reference any object that is instantiated from any class that implements the interface.
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