大话设计模式-工厂方法模式
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using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { interface IFactory { Operation CreateOperation(); } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { class AddFactory:IFactory { public Operation CreateOperation() { return new OperationAdd(); } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { class SubFactory:IFactory { public Operation CreateOperation() { return new OperationSub(); } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { class DivFactory:IFactory { public Operation CreateOperation() { return new OperationDiv(); } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { class MulFactory:IFactory { public Operation CreateOperation() { return new OperationMul(); } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { /// <summary> /// 抽象父类 /// </summary> 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; } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { public class OperationAdd : Operation { public override double GetResult() { double result = 0; result = NumberA + NumberB; return result; } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { public 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; } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { public class OperationMul:Operation { public override double GetResult() { double result = 0; result = NumberA * NumberB; return result; } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { public class OperationSub:Operation { public override double GetResult() { double result = 0; result = NumberA - NumberB; return result; } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MethodsFactory { class Program { static void Main(string[] args) { Console.Write("请输入数字A:"); string numberA = Console.ReadLine(); Console.Write("请输入数字B:"); string numberB = Console.ReadLine(); IFactory operFactory = new AddFactory(); Operation oper = operFactory.CreateOperation(); oper.NumberA = Convert.ToDouble(numberA); oper.NumberB = Convert.ToDouble(numberB); double result = oper.GetResult(); Console.Write("计算结果是:" + result.ToString()); Console.ReadLine(); } } }
工厂方法模式
工厂方法模式(Factory Method),定义一个用于创建对象的接口,让子类决定实例化哪一个工厂。工厂方法使一个类的实例化延迟到其子类.
简单工厂与工厂方法
1.简单工厂模式的最大优点在于工厂类中包含了必要的逻辑判断,根据客户端的选择条件动态实例化相关的类,对于客户端来说,去除了与具体产品的依赖。
2.工厂方法模式实现时,客户端需要决定实例化哪一个工厂来实现运算类,选择判断的问题还是存在的,也就是说,
工厂方法把简单工厂的内部逻辑判断移到了客户端代码来进行。你想要加功能,本来是改工厂类的,而现在是修改客户端.
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