建造者模式

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建造者模式是一种创建型模式，它主要是应对项目中一些复杂对象的创建工作。所谓“复杂对象”，是指此对象中还含有其它的子对象。我们现在定义一个场景：汽车生产必须包含车轮(Wheel)、油箱(OilBox)和车身(Body)，应用建造者模式，用C#控制台应用程序实现该设计，构建BMW品牌和BenZ品牌汽车生产。绘制该模式的UML图。

namespace shiyan4jianzaozhemoshi{    class Product    {        private string partA;        private string partB;        private string partC;        public string PartA        {            set { partA = value; }            get { return partA; }        }        public string PartB        {            set { partB = value; }            get { return partB; }        }        public string PartC        {            set { partC = value; }            get { return partC; }        }        public void Introduce()        {            Console.WriteLine(PartA);            Console.WriteLine(PartB);            Console.WriteLine(PartC);            Console.WriteLine();        }    }    abstract class Builder    {        protected Product product = new Product();        public abstract void BuildPartA();        public abstract void BuildPartB();        public abstract void BuildPartC();        public Product GetResult()        {            return product;        }    }    class ConcreteBuilderBMW : Builder    {        public override void BuildPartA()        {            product.PartA = "Finish Wheel for BMW";        }        public override void BuildPartB()        {            product.PartB = "Finish OilBox for BMW";        }        public override void BuildPartC()        {            product.PartC = "Finish Body for BMW";        }    }    class ConcreteBuilderBenZ : Builder    {        public override void BuildPartA()        {            product.PartA = "Finish Wheel for BenZ";        }        public override void BuildPartB()        {            product.PartB = "Finish OilBox for BenZ";        }        public override void BuildPartC()        {            product.PartC = "Finish Body for BenZ";        }    }    class Director    {        private Builder builder;        public Director(Builder builder)        {            this.builder = builder;        }        public void SetBuilder(Builder builder)        {            this.builder = builder;        }        public void Construct()        {            builder.BuildPartA();            builder.BuildPartB();            builder.BuildPartC();        }    }    class Program    {        static void Main(string[] args)        {            Product pt;            Builder bd = new ConcreteBuilderBMW();            Director dt = new Director(bd);            dt.Construct();            pt = bd.GetResult();            pt.Introduce();            bd = new ConcreteBuilderBenZ();            dt.SetBuilder(bd);            dt.Construct();            pt = bd.GetResult();            pt.Introduce();            //Console.ReadKey();            //Console.ReadLine();            //Console.Read();        }    }}

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