DART

@override in dart

abstract class InterfaceClass {
  String? foo;

  void testFunction();
}

class BaseClass extends InterfaceClass {
  @override
  void testFunction() {
    // TODO: implement testFunction
    foo = 'bar';
  }
}

@override dart

void main() {
  Point point1 = Point(1, 1);
  Point2 point2 = Point2(10, 10);

  print(point2);
  print("toString has been override");
  print(point1);
}

class Point {
  double x, y;
  Point(this.x, this.y);

  @override
  String toString() {
    return "$x : $y";
  }
}

class Point2 {
  double x, y;
  Point2(this.x, this.y);
}