设计模式——简单工厂模式

来源：互联网发布：易语言安装包源码编辑：程序博客网时间：2024/06/06 05:25

本系列摘录于《大话设计模式》旨在记录学习过程，之前看的都忘记了，好在每天一个设计模式工作量也不太大

业务的封装是让业务逻辑与界面逻辑分开，降低耦合度

简单工厂模式：到底实例化谁，将来会不会增加实例化对象

例子：计算器

using System;using System.Collections.Generic;using System.Text;namespace 简单工厂{    class Program    {        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;                if(NumberB==0)                    throw new Exception("除数不能为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;            }        }        static void Main(string[] args)        {            Operation oper;            oper = OperationFactory.createOperate("+");            oper.NumberA = 1;            oper.NumberB = 2;            double result = oper.GetResult();            Console.WriteLine(result);            Console.Read();        }    }}

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