C# Program “Using the IWorking interface”

Question

March 15, 2007

Class provides a definition to override the interface’s abstract definitions. This is one of the ways interface is defined.

 

But in the following example the program Employee class doesn’t provide a definition to override the interface’s abstract definitions. The situation is same in the Animal abstract class as well. That means there is no keyword “override” when defining Work() method within the Employee class and within the Animal abstract class. Anybody explain please. 

using System;

public interface IWorking

{

string Work();

}

class Employee : IWorking

{

private string name;

public Employee(string name)

{

this.name = name;

}

public string GetName()

{

return name;

}

public string Work()

{

return "I do my job";

}

}

abstract class Animal : IWorking

{

protected string name;

public Animal(string name)

{

this.name = name;

}

public string GetName()

{

return name;

}

public abstract string Work();

}

class Dog : Animal

{

public Dog(string name): base(name)

{

}

public override string Work()

{

return "I watch the house";

}

}

class Cat : Animal

{

public Cat(string name) : base(name)

{

}

public override string Work()

{

return "I catch mice";

}

}

class DemoWorking

{

public static void Main()

{

Employee bob = new Employee("Bob");

Dog spot = new Dog("Spot");

Cat puff = new Cat("Puff");

Console.WriteLine("{0} says {1}", bob.GetName(), bob.Work());

Console.WriteLine("{0} says {1}", spot.GetName(), spot.Work());

Console.WriteLine("{0} says {1}", puff.GetName(), puff.Work());

}

}

/*

Output:

Bob says I do my job

Spot says I watch the house

Puff says I catch mice

*/