a hundred degrees

Extending Interfaces and Abstract Classes

It occurred to me to wonder whether abstract classes could extend abstract classes and whether interfaces could extend interfaces.

In short, yes.

Interface example:

//Here I learned that you can aggregate and extend // interfaces in new interfaces. public interface IFlyDetailed: IFlyBehavior, IQuackBehavior { void result(); } public class FlyIntoGlass : IFlyDetailed { #region IFlyDetailed Members public void result() { // TODO: Add FlyIntoGlass.result implementation } #endregion #region IFlyBehavior Members public void fly() { // TODO: Add FlyIntoGlass.fly implementation } #endregion #region IQuackBehavior Members public void quack() { // TODO: Add FlyIntoGlass.quack implementation } #endregion }

Abstract class example:

//Here I learned that you can extend an abstract class // with an abstract class. //Also that you can override an abstract method with an // abstract method. public abstract class RealDuck : Duck { public RealDuck() { quackBehavior = new Quack(); flyBehavior = new FlyWithWings(); } public override abstract void display(); } public class RedheadDuck : RealDuck { public override void display() { Console.WriteLine("I'm a real Redhead Duck"); } }
Posted to Work Life at May 18, 2005 9:05 AM