Implements, Abstract Class.dart

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

  String move();
}
class MonsterKecoak extends Monster implements 
 FlyingMonster, 
 Swimingonster {
 @override String fly() => 'Syuuuung';
 @override Stirng swim() => 'brussshh';
 @override String move() {    
    return 'jalan-jalan';  
 }
}
// Separated by comma