Succession of flutter

Flutter There are both single inheritance and multiple inheritance .

1.abstract Implementation inheritance ：

abstract class a {
    
  void funcA() {
    }
}

///  If it is single inheritance , The internal method is to be implemented by the parent class 
class b extends a {
    
@override
  void funcA() {
    
    // TODO: implement funcA
    super.funcA();
  }
}

///  If it's implementing interfaces , You must realize , Multiple interfaces can be implemented 
class c implements a {
    
  @override
  void funcA() {
    
    // TODO: implement funcA
  }
}

2.mixin Implement multiple inheritance

/// mixin Single inheritance is not supported 
mixin a {
    
  void funcA() {
    

  }
}

///  You can not implement the methods of the parent class , You can call the default method directly 
class b with a {
    
  @override
  void funcA() {
    
    // TODO: implement funcA
    super.funcA();
  }
}