#683 – Two Ways an Object Can Behave Polymorphically

There are a couple of different ways that an object can behave polymorphically.  Here are two examples.

Polymorphic behavior #1 – access instance of subclass using reference to base class.

    public class Dog
    {
        public virtual void Bark()
        {
            Console.WriteLine("Dog: Woof");
        }
    }

    public class Terrier : Dog
    {
        public override void Bark()
        {
            Console.WriteLine("Terrier: Yip yip");
        }
    }
            // Terrier method called through Dog reference
            Dog d = new Terrier();
            d.Bark();

Polymorphic behavior #2 – Base class calls method that is overridden in derived class

        // Dog.GuardUs
        public void GuardUs()
        {
            Bark();
        }
            Terrier t = new Terrier();
            t.GuardUs();

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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