C# - 简单工厂模式

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 简单工厂模式
{
class Program
{
static void Main(string[] args)
{
Console.Write("请输入你要的电脑：");
string brand = Console.ReadLine();
Notepad nt = GC(brand);
nt.SayHello();
Console.ReadKey();
}

/// <summary>
/// 简单工厂模式
/// </summary>
/// <param name="brand"></param>
/// <returns></returns>
public static Notepad GC(string brand)
{
Notepad nt = null;

switch (brand)
{
//核心代码
case "Lenovo": nt = new Lenovo(); break;
case "Acer": nt = new Acer(); break;
case "IBM": nt = new IBM(); break;
default:break;
}

return nt;
}
}

/// <summary>
/// 父类
/// </summary>
public abstract class Notepad
{
public abstract void SayHello();
}

/// <summary>
/// 宏基
/// </summary>
public class Acer : Notepad
{
public override void SayHello()
{
Console.WriteLine("我是宏基！");
}
}

/// <summary>
/// 联想
/// </summary>
public class Lenovo : Notepad
{
public override void SayHello()
{
Console.WriteLine("我是联想！");
}
}

/// <summary>
/// IBM
/// </summary>
public class IBM : Notepad
{
public override void SayHello()
{
Console.WriteLine("我是IBM！");
}
}
}