Abstract classes and methods in C Sharp (C#) - Mini Project: Build & Apply

Abstract Classes and Methods in C#

📖 Scenario: Imagine you are creating a simple program for a zoo. Different animals make different sounds, but all animals share some common features. We want to use abstract classes and methods to model this.

🎯 Goal: You will create an abstract class called Animal with an abstract method MakeSound(). Then, you will create two classes Dog and Cat that inherit from Animal and implement the MakeSound() method. Finally, you will create objects of these classes and call their MakeSound() methods to see the sounds they make.

📋 What You'll Learn

Create an abstract class called Animal

Add an abstract method called MakeSound() in Animal

Create classes Dog and Cat that inherit from Animal

Implement the MakeSound() method in both Dog and Cat

Create objects of Dog and Cat and call their MakeSound() methods

Print the sounds to the console

💡 Why This Matters

🌍 Real World

Abstract classes are used in software to define common features for related objects, like different animals in a zoo, vehicles, or employees.

💼 Career

Understanding abstract classes and methods is important for designing flexible and reusable code in many programming jobs.

1

Create the abstract class Animal

Create an abstract class called Animal with an abstract method MakeSound() that returns void.

C Sharp (C#)

abstract class Animal
{
    // Your code here
}

Need a hint?

Use the keyword abstract before the class and method. The method has no body.

2

Create Dog and Cat classes inheriting Animal

Create classes called Dog and Cat that inherit from Animal.

C Sharp (C#)

abstract class Animal
{
    public abstract void MakeSound();
}

// Your code here

Need a hint?

Use : to inherit and override keyword to implement the abstract method.

3

Implement MakeSound() in Dog and Cat

In the Dog class, implement MakeSound() to print "Woof!". In the Cat class, implement MakeSound() to print "Meow!".

C Sharp (C#)

abstract class Animal
{
    public abstract void MakeSound();
}

class Dog : Animal
{
    public override void MakeSound()
    {
        // Your code here
    }
}

class Cat : Animal
{
    public override void MakeSound()
    {
        // Your code here
    }
}

Need a hint?

Use Console.WriteLine() to print the sounds inside the method bodies.

4

Create objects and call MakeSound()

In the Main method, create an object of Dog called dog and an object of Cat called cat. Call dog.MakeSound() and cat.MakeSound() to print their sounds.

C Sharp (C#)

using System;

abstract class Animal
{
    public abstract void MakeSound();
}

class Dog : Animal
{
    public override void MakeSound()
    {
        Console.WriteLine("Woof!");
    }
}

class Cat : Animal
{
    public override void MakeSound()
    {
        Console.WriteLine("Meow!");
    }
}

class Program
{
    static void Main()
    {
        // Your code here
    }
}

Need a hint?

Create the objects with new and call their MakeSound() methods inside Main.