static void Main()
{
/* Objects and Classes*/
Animal dogAnimal = new Animal(); // You create an instance of the Class 'Animal' with the empty constructor
dogAnimal.Name = "Dog"; //You set the property Name to Dog
Animal catAnimal = new Animal("Cat"); // You create an instance of the Class 'Animal' with a parameter for Name
Console.WriteLine("Dog's animal name is " + dogAnimal.Name);
Console.WriteLine("Cats's animal name is " + catAnimal.Name);
//Two vars can reference the same Object
Animal bearOne = new Animal("Bear");
Animal bearTwo = bearOne;
Console.WriteLine("bearTwo name is " + bearTwo.Name);
//One var can reference different Objects (at different time)
Animal lion = new Animal("Tiger");
lion = new Animal("Lion");
Console.WriteLine("lion name is " + lion.Name);
/* Inheritance*/
Animal dog = new Dog("Dog");
Console.WriteLine("Dog's name is " + dog.Name);
Animal cat = new Cat("Cat");
Console.WriteLine("Cat's name is " + cat.Name);
Console.WriteLine("Cat's, which are Animals, breathe like this ");
cat.Breathe(); //method defined for all Animals
Console.ReadLine();
}
public void PassObjectReferenceByReference()
{
Animal animal = new Animal();
animal.Age = 5;
SetAgeToTwoByRef(ref animal);
Assert.IsTrue(animal.Age == 2);
Assert.IsFalse(animal.Age == 5);
}
public void PassObjectReferenceByValue()
{
Animal animal = new Animal();
animal.Age = 5;
SetAgeToTwo(animal);
Assert.IsTrue(animal.Age == 5); //Object vars should remain the same
Assert.IsFalse(animal.Age == 2);
}
public void PassByValue()
{
Animal animal = new Animal();
animal.Age = 5;
int animalAge = 5;
addBirthday(animal, animalAge);
Assert.IsTrue(animal.Age == 6); //animal variable is a reference, therfore, changes inside the method will alter the Object
Assert.IsTrue(animalAge == 5); //animalAge is passed by value, since it is a primitive type, which means we send a copy of the variable, which once it is out of scope,
//it is lost
}
private void SetAgeToTwoByRef(ref Animal animal)
{
animal = new Animal(); //We are changing the reference of the variable animal which is a reference of the object animal
animal.Age = 2; //we change the value on the object 'animal'
}
private void SetAgeToTwo(Animal animal)
{
animal = new Animal(); //We are changing the reference of the variable 'animal', therfore the original object won't be changed
animal.Age = 2;
}
private void addBirthday(Animal animal, int animalAge)
{
animal.Age++;
animalAge++;
}