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Object Composition Over Inheritance

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1 May 2011CPOL3 min read 61.9K   470   12  
Why to prefer object composition over inheritance
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace RightComposition.ClassesAndInterfaces
{
    public class Leader:IEmployee,IPrinterEnabled
    {
        private string name;
        private int experience;
        private IPrinterCommand printManager;

        #region IEmployee Members

        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }

        public int Experience
        {
            get
            {
                return experience;
            }
            set
            {
                experience = value;
            }
        }

        #endregion

        #region IPrinterEnabled Members

        public IPrinterCommand PrintManager
        {
            get
            {
                return printManager;
            }
            set
            {
                printManager = value;
            }
        }

        #endregion

        public Leader()
        {
            name = "Leader";
            experience = 5;
            //Note: We can inject information for concrete object IPrinterCommand from outside, but object initialization
            // is not focus of article I have hardcoded it here.
            //In practical world this printer object will be set from outside place, allowing plug and play.
            printManager = new AveragePrinter();
            printManager.Initialize();
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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