Implementing interfaces in C Sharp (C#) - Mini Project: Build & Apply

Implementing interfaces

📖 Scenario: You are creating a simple program to manage different types of vehicles. Each vehicle can start and stop, but the way they do it might differ. To keep things organized, you will use an interface to define these actions.

🎯 Goal: Build a C# program that defines an interface IVehicle with methods Start() and Stop(). Then create two classes Car and Bike that implement this interface. Finally, create objects of these classes and call their methods.

📋 What You'll Learn

Create an interface called IVehicle with methods Start() and Stop().

Create a class called Car that implements IVehicle.

Create a class called Bike that implements IVehicle.

In each class, implement Start() and Stop() methods with simple Console.WriteLine messages.

Create objects of Car and Bike and call their Start() and Stop() methods.

💡 Why This Matters

🌍 Real World

Interfaces are used in software to define common behaviors that different classes must implement, like how different vehicles share start and stop actions.

💼 Career

Understanding interfaces is essential for writing clean, maintainable code in many programming jobs, especially in object-oriented programming.

1

Create the interface IVehicle

Create an interface called IVehicle with two methods: void Start() and void Stop().

C Sharp (C#)

// Your code here
// Define interface IVehicle with Start() and Stop() methods

Need a hint?

An interface in C# uses the interface keyword and only declares method signatures without bodies.

2

Create the Car class implementing IVehicle

Create a class called Car that implements the IVehicle interface. Implement the Start() method to print "Car started" and the Stop() method to print "Car stopped" using Console.WriteLine.

C Sharp (C#)

public interface IVehicle
{
    void Start();
    void Stop();
}

// Your code here
// Define class Car implementing IVehicle with Start() and Stop() methods

Need a hint?

Use public class Car : IVehicle to implement the interface. Implement both methods with Console.WriteLine messages.

3

Create the Bike class implementing IVehicle

Create a class called Bike that implements the IVehicle interface. Implement the Start() method to print "Bike started" and the Stop() method to print "Bike stopped" using Console.WriteLine.

C Sharp (C#)

public interface IVehicle
{
    void Start();
    void Stop();
}

public class Car : IVehicle
{
    public void Start()
    {
        Console.WriteLine("Car started");
    }

    public void Stop()
    {
        Console.WriteLine("Car stopped");
    }
}

// Your code here
// Define class Bike implementing IVehicle with Start() and Stop() methods

Need a hint?

Similar to Car, implement Bike with the interface methods printing the correct messages.

4

Create objects and call methods

In the Main method, create an object of Car called myCar and an object of Bike called myBike. Call Start() and Stop() on both objects. Use Console.WriteLine to display the messages from these methods.

C Sharp (C#)

public interface IVehicle
{
    void Start();
    void Stop();
}

public class Car : IVehicle
{
    public void Start()
    {
        Console.WriteLine("Car started");
    }

    public void Stop()
    {
        Console.WriteLine("Car stopped");
    }
}

public class Bike : IVehicle
{
    public void Start()
    {
        Console.WriteLine("Bike started");
    }

    public void Stop()
    {
        Console.WriteLine("Bike stopped");
    }
}

class Program
{
    static void Main()
    {
        // Your code here
        // Create objects myCar and myBike and call Start() and Stop() on both
    }
}

Need a hint?

Create objects using new keyword and call the methods directly. The output should show the messages in order.