//duplicate signature
//public static string PetStatus(string owner, Dog dog)
//{
// return owner;
//}
static void Main(string[] args)
{
Dog sparky = new Dog()
{
Name = "Sparky", Age = 3
};
Cat alice = new Cat()
{
Name = "Alice", IsLazy = true
};
PetStatus("Paul", sparky);
PetStatus(alice);
//no problem -> inherited types
sparky.Eat();
alice.Eat();
//thanks to runtime polymorphism the right methods are called
Pet firstPet = new Dog()
{
Name = "Sparky", Age = 3
};
Pet secondPet = new Cat()
{
Name = "Alice", IsLazy = true
};
firstPet.Eat();
secondPet.Eat();
List <Pet> pets = new List <Pet>();
pets.Add(sparky); //dog
pets.Add(alice); //cat;
pets.Add(new Pet()
{
Name = "Barnie"
});
//thanks to runtime polymorphism the right methods are called
foreach (Pet pet in pets)
{
pet.Eat();
}
Console.ReadLine();
}
static void Main(string[] args)
{
//1.definition
Object o = 123;
Object o1 = new Dog();
int ii = 'A'; //자동 형변환 ; 큰 집합 = 작은 집합
Animal a = new Dog(); //상속한 부분(animal에 있는것)만 가능, dog의 있는 건 호풀 불가능하다.
a.Eat(); //상속한 부분(animal에 있는것)만 사용 가능하다.
// a.Bark(); //dog의 있는 건 호풀 불가능하다.
//Animal c = new Cat(); //Animal type의 면수; polymarphism(다형성) ; 큰 집합(super class) = 작은 집합
//Animal d = new Dog();
Console.WriteLine();
//2.array
Object[] oa = new Object[2]; //모든게 들어간다
//3.parameter
List <Object> olist = new List <object>(); //모든게 들어간다
Console.WriteLine();
int[] ia = new int[2];
ia[0] = 'A'; //int 배열엔 int.char도 들어간다 *long면 int,char도 들어간다--
Animal[] aa = new Animal[2];
aa[0] = new Dog();
aa[1] = new Cat();
for (int i = 0; i < aa.Length; i++)
{
aa[i].Eat();
aa[i].Sleep();
}
Console.WriteLine();
List <Animal> list = new List <Animal>();
list.Add(new Dog());
list.Add(new Cat());
foreach (var item in list)
{
item.Eat();
item.Sleep();
if (item is Cat)
{
((Cat)item).Meow();
} //(item is Cat) ->true/false
if (item is Dog)
{
(item as Dog).Bark();
} //(item as Dog) -> object/null
}
//4.return
//5.overriding
Animal d = new Dog();
d.Eat();
d = new Cat();
d.Eat();
}