Collections

arun_babu_a · October 28th, 2011, 10:09 AM

In Chapter 11 example Program 1
In program.cs
We are creating an instance of Cow class and assigned it to
an array of type Animal.
but in next line without creating an instance of Chicken class
we are assigning it to the array

Code:

animalArray[1]=new Chicken("Ken");

here what's the name of the instance of Chicken Class i.e object name

When calling myAnimal.Name

Code:

 Console.WriteLine("New {0} object added to Array collections,Name={1}",myAnimal.ToString(),myAnimal.Name);

what happens to the code.Please
split and explain the execution cycle

ChristianNagel · October 29th, 2011, 03:38 PM

Quote:

Originally Posted by arun_babu_a

but in next line without creating an instance of Chicken class
we are assigning it to the array

Code:

animalArray[1]=new Chicken("Ken");

No, an instance of the Chicken class is created. It's just not assigned to a variable but instead directly to the second element of the array.

This code creates a new instance:

Code:

new Chicken("Ken")

And here the instance is assigned to the second element of the array:

Code:

animalArray[1] = new Chicken("Ken")

ChristianNagel · October 29th, 2011, 04:02 PM

And the second question,

Quote:

Originally Posted by arun_babu_a

When calling myAnimal.Name

Code:

 Console.WriteLine("New {0} object added to Array collections,Name={1}",myAnimal.ToString(),myAnimal.Name);

what happens to the code.Please
split and explain the execution cycle

With

Code:

myAnimal.Name

you are accessing the get accessor of the Name property that returns the value of the name variable of the object. The Name property is defined on page 279

Code:

protected string name;
public string Name
{
  get
  {
    return name;
  }
  set
  {
    name = value;
  }
}

Properties are defined starting on page 244, "Defining Properties".