C#设计模式之抽象工厂(abstract factory)模式示例源代码

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using System; namespace Design_Pattern {  public class  Computer  {   private RAM Ram;   private CPU Cpu;   public Computer(RAM ram,CPU cpu)   {    this.Ram =ram;    this.Cpu =cpu;        Console .WriteLine("A Computer is Composed! "+this.Ram +" "+this.Cpu );   }  }  public abstract class RAM  {   public abstract  Computer ComposeAComputer(CPU cpu);  }  public abstract class CPU  {  public abstract  Computer ComposeAComputer(RAM ram);  }    public class pcRAM:RAM  {   public override Computer ComposeAComputer(CPU cpu)   {    Console .WriteLine ("pcComputer...");    return new Computer(this,cpu);   }     }  public class pcCPU:CPU  {   public override Computer ComposeAComputer(RAM ram)   {    Console .WriteLine ("pcComputer...");    return new Computer(ram,this);   }  }  public class macRAM:RAM  {   public override Computer ComposeAComputer(CPU cpu)   {    Console .WriteLine ("MacComputer...");    return new Computer(this,cpu);   }     }  public class macCPU:CPU  {   public override Computer ComposeAComputer(RAM ram)   {    Console .WriteLine ("MacComputer...");    return new Computer(ram,this);   }  }    public abstract class abstractFactory {        public abstract  RAM CreateRam();    public abstract CPU CreateCpu() ; }  public class PcFactory:abstractFactory  {   public override RAM CreateRam()   {    return new pcRAM();   }   public override CPU CreateCpu()   {    return new pcCPU();   }  }  public class MacFactory:abstractFactory  {   public override RAM CreateRam()   {    return new macRAM();   }   public override CPU CreateCpu()   {    return new macCPU();   }  }  class ITMarket  {   private RAM ram;   private CPU cpu;   public ITMarket(abstractFactory factory)   {    this.ram =factory.CreateRam();    this.cpu =factory.CreateCpu();   }   public void Run()   {    ram.ComposeAComputer(cpu);    cpu.ComposeAComputer(ram);   }  }  class ClientApp  {   public static void Main(string[] args)   {    Console .WriteLine("PC Factory.....\n");    abstractFactory pcfactory=new PcFactory ();    ITMarket itMarket=new ITMarket (pcfactory);    itMarket .Run ();    Console .WriteLine("MAC Factory.....\n");    abstractFactory macfactory=new MacFactory();    itMarket =new ITMarket (macfactory);    itMarket .Run ();   }  }     }