简单工厂模式

简单工厂模式
面向对象编程，并不是类越多越好，类的划分是为了封装，但分类的基础是抽象，具有相同属性和功能的对象的抽象集合才是类

简单工厂模式最大的优点在于工厂类中包含了必要的逻辑判断，根据客户端选择的条件动态的实例化相关的类，对于客户端来说，去除了与具体产品的依赖

利用简单工厂模式编写具有加减乘除运算功能的小程序

public class Operation   //Operation运算类 { //添加两个属性 private double _numberA = 0; private double _numberB = 0; //封装两个属性 public double NumberA { get { return _numberA; } set { _numberA = value; } } public double NumberB { get { return _numberB; } set { _numberB = value; } } //添加可重写的获得结果的方法，返回结果的值
  public virtual double GetResult() { double result = 0; return result; }
} class OperationAdd : Operation//加法运算类 { public override double GetResult() { double result = 0; result = NumberA + NumberB; return result; } } class OperationSub : Operation//减法运算类 { public override double GetResult() { double result = 0; result = NumberA ‐ NumberB; return result; } } class OperationMul : Operation//乘法运算类 { public override double GetResult() { double result = 0; result = NumberA* NumberB; return result; } } class OperationDiv : Operation//除法运算类 { public override double GetResult() { double result = 0; result = NumberA* NumberB; return result; } } public class OperationFactory//简单运算工厂类 { 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; }
} class Program//客户端代码 { static void Main(string[] args) { Operation oper; oper = OperationFactory.createOperate("+"); oper.NumberA = 56; oper.NumberB = 55; double result = oper.GetResult(); Console.WriteLine(result); Console.ReadKey(); } } }

  

 

  
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文章来源: czhenya.blog.csdn.net，作者：陈言必行，版权归原作者所有，如需转载，请联系作者。

原文链接：czhenya.blog.csdn.net/article/details/78002401