Objektum példa C Sharp nyelven

C# nyelven

Track.cs:

using System;

namespace Teszt
{
    public class Track
    {
        public string Title { get; private set; }

        public int Length { get; private set; }

        public Track(string title, int length)
        {
            Title = title;
            Length = length;
        }
    }
}

CD.cs:

using System;

namespace Teszt
{
    public abstract class CD
    {
        public abstract int Capacity { get; protected set; }

        public abstract int Allocated { get; }
    }   
}

MusicCD.cs:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Teszt
{
    public class MusicCD : CD
    {
        public List<Track> Tracks { get; set; }

        public override int Capacity { get; protected set; }

        public override int Allocated
        {
            get { return Tracks.Sum(t => t.Length); }
        }

        public MusicCD(int capacity)
        {
            Capacity = capacity;
            Tracks = new List<Track>();
        }

        public void PrintContent(TextWriter textWriter)
        {
            StringBuilder sb = new StringBuilder();

            Tracks.ForEach(t =>
            {
                sb.AppendLine(string.Format("{0} - {1}", t.Title, t.Length));
            });

            textWriter.Write(sb.ToString());
        }
    }
}

És a használatuk, Program.cs:

using System;

namespace Teszt
{
    class Program
    {
        static void Main(string[] args)
        {           
            MusicCD cd = new MusicCD(4800);

            cd.Tracks.Add(new Track("Pledge of Allegiance", 299));
            cd.Tracks.Add(new Track("Lullaby for the New World Order", 232));
            cd.Tracks.Add(new Track("Weapon", 358));
            cd.Tracks.Add(new Track("In a World Called Catastrophe", 357));
            cd.Tracks.Add(new Track("Avalanche", 446));
            cd.Tracks.Add(new Track("21st Century Living", 190));

            cd.PrintContent(Console.Out);
            Console.ReadKey();
        }
    }
}