DependencyInjection/InterfacesTask.cs

namespace DependencyInjections
{
    public interface IPayment
    {
        void ProcessPayment(decimal amount);
    }

    public class CreditCardPayment : IPayment
    {
        public void ProcessPayment(decimal amount)
        {
            Console.WriteLine($"Processing credit card payment for {amount} kr.");
        }
    }

    public class PayPalPayment : IPayment
    {
        public void ProcessPayment(decimal amount)
        {
            Console.WriteLine($"Processing PayPal payment of {amount} kr.");
        }
    }

    public interface IPrintable
    {
        void Print();
    }

    public class PrintInvoice : IPrintable
    {
        public void Print()
        {
            Console.WriteLine($@"
                ====== INVOICE ======
                
                1 stk båd 1299 kr.

                Total 1299 kr.
            ");
        }
    }

    public class PrintReport : IPrintable
    {
        public void Print()
        {
            Console.WriteLine("Report printing...");
        }
    }

    public class PrintLetter : IPrintable
    {
        public void Print()
        {
            Console.WriteLine("Printing letter...");
        }
    }

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

    public class Vehicle
    {
        public string brand { get; set; }
    }

    public class Car : Vehicle, IDriveable
    {
        public bool started = false;

        public Car(string brand)
        {
            this.brand = brand;
        }

        public void Start()
        {
            this.started = true;
            Console.WriteLine($"Starting {this.brand}");
        }

        public void Stop()
        {
            this.started = false;
            Console.WriteLine($"Stopping {this.brand}");
        }
    }

    public class Motorcycle : Vehicle, IDriveable
    {
        public bool started = false;

        public Motorcycle(string brand)
        {
            this.brand = brand;
        }

        public void Start()
        {
            this.started = true;
            Console.WriteLine($"Starting {this.brand}");
        }

        public void Stop()
        {
            this.started = false;
            Console.WriteLine($"Stopping {this.brand}");
        }
    }

    public interface IMakeSound
    {
        void MakeSound();
    }

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

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

    public class Cow : IMakeSound
    {
        public void MakeSound()
        {
            Console.WriteLine("Moo");
        }
    }

    public interface IWeapon
    {
        int Attack();
    }

    public class Sword : IWeapon
    {
        public int Attack()
        {
            return 10;
        }
    }

    public class Bow : IWeapon
    {
        public int Attack()
        {
            return new Random().Next(5, 16);
        }
    }

    public class Staff : IWeapon
    {
        public int MagicPower { get; set; } = 10;

        public int Attack()
        {
            return MagicPower;
        }
    }
}