public static void Main()
{
// polymorphism - we use given data type through other data type (interface or parent class)
IAnimal cat = new Cat("Dzhoni", 7);
IAnimal dog = new Dog("Sharo", 5);
Console.WriteLine(cat.Speak());
Console.WriteLine(dog.Speak());
// no polymorphism
var secondCat = new Cat("Dzhinks", 3);
Cat thirdCat = new Cat("Fluffy", 1);
Console.WriteLine(secondCat.Purr());
Console.WriteLine(thirdCat.Purr());
// cat has no Purr() method, because it's IAnimal
var secondDog = new Dog("Doggy", 3);
Dog thirdDog = new Dog("Spike", 4);
Console.WriteLine(secondDog.CatchBone());
Console.WriteLine(thirdDog.CatchBone());
// dog has no CatchBone() method, because it's IAnimal
Console.WriteLine();
// without polymorphism
List <Cat> cats = new List <Cat>();
cats.Add(secondCat);
cats.Add(thirdCat);
List <Dog> dogs = new List <Dog>();
dogs.Add(secondDog);
dogs.Add(thirdDog);
foreach (var curCat in cats)
{
Console.WriteLine(curCat.Speak());
}
foreach (var curDog in dogs)
{
Console.WriteLine(curDog.Speak());
}
Console.WriteLine();
// using polymorphism - mix different related types in the same collection
List <IAnimal> animals = new List <IAnimal>();
animals.Add(cat);
animals.Add(secondCat);
animals.Add(thirdCat);
animals.Add(dog);
animals.Add(secondDog);
animals.Add(thirdDog);
foreach (var curAnimal in animals)
{
Console.WriteLine(curAnimal.Speak());
}
Console.WriteLine();
// using polymorphism - invoke abstract operations
SayAnimalName(cat);
SayAnimalName(secondCat);
SayAnimalName(thirdCat);
SayAnimalName(dog);
SayAnimalName(secondDog);
SayAnimalName(thirdDog);
Console.WriteLine();
// using polymorphism - declare a more generic field which will be initialized and "specialized" later
IAnimal animal;
string animalType = "Cat";
switch (animalType)
{
case "Cat": { animal = new Cat("Puh", 1); Console.WriteLine(animal.Name); break; }
case "Dog": { animal = new Dog("Snoop", 1); Console.WriteLine(animal.Name); break; }
default:
break;
}
Console.WriteLine();
// polymorphism
Animal fourthCat = new Cat("Sam", 5);
Animal fourthDog = new Dog("Chestar", 4);
Console.WriteLine(fourthCat.ToString()); //Animals.Animals.Cat
Console.WriteLine(fourthDog.ToString()); //I'm a dog.
Console.WriteLine(fourthCat.Age);
Console.WriteLine(fourthDog.Age);
Kitten kitten = new Kitten("Baby", 1);
Console.WriteLine(kitten.Speak());
Console.WriteLine();
try
{
Animal oldCat = new Cat("Oldi", 150);
}
catch (InvalidAnimalAgeException ex) // defined exception class in folder Exceptions
{
Console.WriteLine(ex.MinAge);
Console.WriteLine(ex.MaxAge);
}
}
