//Lets the Factory class decides which class to instantiate. Classes must be of same base type.
using System;
class Program
{
abstract class Position //or interface
{
public abstract string Title { get; }
}
class Manager : Position
{
public override string Title
{
get { return "Manager"; }
}
}
class Clerk : Position
{
public override string Title
{
get { return "Clerk"; }
}
}
class Programmer : Position
{
public override string Title
{
get { return "Programmer"; }
}
}
static class Factory
{
/// <summary>
/// Decides which class to instantiate.
/// </summary>
public static Position Get(int id)
{
switch (id)
{
case 0:
return new Manager();
case 1:
case 2:
return new Clerk();
case 3:
default:
return new Programmer();
}
}
}
static void Main()
{
for (int i = 0; i <= 3; i++)
{
var position = Factory.Get(i);
Console.WriteLine("Where id = {0}, position = {1} ", i, position.Title);
}
}
}
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