Interface declaration syntax in C Sharp (C#) - Mini Project: Build & Apply

Interface Declaration Syntax in C#

📖 Scenario: Imagine you are designing a simple system for different types of vehicles. Each vehicle should be able to start and stop. To ensure all vehicles follow this rule, you will use an interface.

🎯 Goal: You will create an interface called IVehicle with two methods: Start() and Stop(). Then, you will create a class that implements this interface.

📋 What You'll Learn

Create an interface named IVehicle

Declare two methods inside IVehicle: Start() and Stop()

Create a class named Car that implements the IVehicle interface

Implement the Start() and Stop() methods in the Car class

Print messages when Start() and Stop() are called

💡 Why This Matters

🌍 Real World

Interfaces help define rules that different classes must follow, like how different vehicles must be able to start and stop.

💼 Career

Understanding interfaces is important for designing flexible and maintainable code in many software development jobs.

1

Create the IVehicle interface

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

C Sharp (C#)

// Your code here

Need a hint?

Use the interface keyword followed by the interface name. Inside, declare the methods without bodies.

2

Create the Car class implementing IVehicle

Create a class called Car that implements the IVehicle interface.

C Sharp (C#)

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

// Your code here

Need a hint?

Use class Car : IVehicle to implement the interface. Add method stubs for Start() and Stop().

3

Implement the Start() and Stop() methods

Inside the Car class, implement the Start() method to print "Car started" and the Stop() method to print "Car stopped".

C Sharp (C#)

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

public class Car : IVehicle
{
    public void Start()
    {
        // Your code here
    }
    public void Stop()
    {
        // Your code here
    }
}

Need a hint?

Use System.Console.WriteLine() to print messages inside each method.

4

Create a Car object and call its methods

Create an object of the Car class named myCar. Call the Start() method, then call the Stop() method.

C Sharp (C#)

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

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

// Your code here

Need a hint?

Create the myCar object with new Car(). Then call myCar.Start() and myCar.Stop().