Rillwz

class Hero extends Character {
  String hitMonster() {
    return 'Take this..!';
  }
}

!------------------------------------------------------

mixin DrinkAbility on Hero{
  String drink() => 'gluk...gluk...gluk...';

Rillwz

abstract class FlyingMonster {  
  String fly();
}
abstract class SwimingMonster {
  String swim();
}
abstract class Monster extends Character {
  String eatHuman() {
    return 'Grr.. Delicious ..';
  }

Rillwz

// Implementasi Abstract Class
// Abstract_Class_Pointer = Name of abstract_Class
abstract class Bicara{
   void say();
}
class HelloWorld Extends Bicara {
   @override
   void say() {
    print('something');
   }