C# Examples: Interfaces

Source File: Preparation.cs

public enum SportCategory
{
	SinglePlayer,
	Collective,
	Unknown
}

public interface ICourtDimensions
{
	double Length { get; set; }
	double Width  { get; set; }
}

public interface IBall
{
	int NumberOfPlayers
	{
		get;
		set;
	}

	string NameOfSport
	{
		get;
	}

	void SportCharacteristics();
}

public interface ISportType : IBall, ICourtDimensions
{
	SportCategory Type
	{
		get;
	}
}

Source File: Sport.cs

using System;

public class SportBall : ISportType
{
	int players;
	string sport;
	SportCategory _type;
	double Len;
	double Wdt;
    
	public SportBall(int nbr, SportCategory tp, string name)
	{
		players = nbr;
		_type   = tp;
		sport   = name;
	}

	public int NumberOfPlayers
	{
		get	{ return players;}
		set	{ players = value;}
	}

	public string NameOfSport
	{
		get	{ return sport; }
	}

	public SportCategory Type
	{
		get	{ return _type; }
	}

	public double Length
	{
		get { return Len; }
		set { Len = value; }
	}

	public double Width
	{
		get { return Wdt; }
		set { Wdt = value; }
	}

	public void SportCharacteristics()
	{
		Console.WriteLine("Sport Characteristics");
		Console.WriteLine("Name of Sport: {0}", NameOfSport);
		Console.WriteLine("Type of Sport: {0}", Type);
		Console.WriteLine("# of Players:  {0}", NumberOfPlayers);
		Console.WriteLine("Court Dimensions: {0}m x {1}m", Len, Wdt);
	}
}

Source File: Exercise.cs

using System;

class Exercise
{
	static void Main()
	{
		SportBall volley = new SportBall(6, SportCategory.Collective, "Volley Ball");
		volley.Length = 18;
		volley.Width  = 9;
		volley.SportCharacteristics();

		Console.WriteLine();

	SportBall tennis = new SportBall(1, SportCategory.SinglePlayer, "Table Tennis");
		tennis.Length = 23.7;
		tennis.Width  = 8.25;
		tennis.SportCharacteristics();

		Console.WriteLine();
	}
}