C#

public abstract class LinkedList<T>
{
    //....

    public static LinkList<T> GetDoubleLinked()
    {
        return new DoubleLinked<T>();
    }

    public static LinkList<T> GetSingleLinked()
    {
        return new SingleLinked<T>();
    }

    // abstract methods needed to be overriden.
}

public class DoubleLinked<T> : LinkedList<T>
{
    // Override parent's
}

public class SingleLinked<T> : LinkedList<T>
{
    // Override parent's
}

LinkedList<string> singleLinked = LinkedList<string>.GetSingleLinked();

LinkedList<string> doubleLinked = LinkedList<string>.GetDoubleLinked();

public abstract Node<T> GetNode(T data);
public abstract void AddNode(Node<T>);

public Node<T> GetNode(T data) { return new SingleNode<T>(data); }

public Node<T> GetNode(T data) { return new DoubleNode<T>(data); }

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Lent Revisited
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Tom Wright wrote:

However CD-ROMs will be around for quite a while and since I never said that all machine have them, there are the select few who do not order them with their machines. Heck I even had a PC that had no floppy, harddrive, or CD-ROM. It had a boot ROM on the network card and booted from a boot file on the network. That was back awhile. No sure if they still do that.

<br />
            try <br />
            {<br />
                string[] drives = System.IO.Directory.GetLogicalDrives();<br />
<br />
                foreach (string str in drives) <br />
                {<br />
                    System.Console.WriteLine(str);<br />
                }<br />
            }<br />
            catch (System.IO.IOException) <br />
            {<br />
                System.Console.WriteLine("An I/O error occurs.");<br />
            }<br />
            catch (System.Security.SecurityException) <br />
            {<br />
                System.Console.WriteLine("The caller does not have the " +<br />
                    "required permission.");<br />
            }<br />

	static public void Main(string[] args)<br />
	{<br />
        // Drives are only possible from A: till Z:<br />
<br />
        for (char driveLetter = 'A'; driveLetter <= 'Z'; driveLetter++)<br />
        {<br />
            DriveInfo drive = new DriveInfo(driveLetter.ToString());<br />
            switch (drive.DriveType)<br />
            {<br />
                case DriveType.NoRootDirectory:<br />
                    // No drive<br />
                    break;<br />
                default:<br />
                    Console.WriteLine("Found drive at " + drive + " of type " + drive.DriveType);<br />
                    break;<br />
            }<br />
        }<br />
	}<br />