《大话设计模式》读书笔记1 简单工厂模式

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简单工厂模式（Simple Factory Pattern）属于类的创新型模式，又叫静态工厂方法模式（Static FactoryMethod Pattern）,是通过专门定义一个类来负责创建其他类的实例，被创建的实例通常都具有共同的父类。

简单工厂模式结构图：

简单工厂模式实现代码：

public class Operation{private double _numberA=0;private double _numberB=0;public double NumberA{get( return _numberA;)set(_numberA=value);}public double NumberB{get( return _numberB;)set(_numberB=value);}public virtual double GetResult(){double result=0;return result;}}class OperationAdd:Operation{public override double GetResult(){double result=0;result=NumberA+NumberB;return result;}}class OperationSub:Operation{public override double GetResult(){double result=0;result=NumberA-NumberB;return result;}}class OperationMul:Operation{public override double GetResult(){double result=0;result=NumberA*NumberB;return result;}}class OperationDiv:Operation{public override double GetResult(){double result=0;result=NumberA/NumberB;return result;}}public class OperationFactory{public static Operation createOperate(string operate){Operation oper=null;switch(operate){case "+":oper=new OperationAdd();break;case "-"oper=new OperationSub();break;case "*"oper=new OperationMul();break;case "/"oper=new OperationDiv();break;}return oper;}}//客户端代码Operation oper;oper=OperationFactory.createOperate("+");oper.Number1=1;oper.Number2=2;double result=oper.GetResult();

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