设计模式

来源：互联网发布：安卓限速软件编辑：程序博客网时间：2024/06/11 19:54

整理《大话设计模式》，力图代码简单明了，结构一目了然：

工厂方法-计算器

namespace 工厂方法_计算器
{
    class Operation                                                                                      // 运算类
    {
        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() { return 0; }                                                  // 得到运算结果
    }

    class OperationAdd : Operation { public override double GetResult() { return NumberA + NumberB; } }                           // +法类
    class OperationSub : Operation { public override double GetResult() { return NumberA - NumberB; } }                           // -法类
    class OperationMul : Operation { public override double GetResult() { return NumberA * NumberB; } }                           // *法类
    class OperationDiv : Operation { public override double GetResult() { if (NumberB == 0) throw new Exception("除数不能为0"); // /法类
                                                                          return NumberA / NumberB; } }

    interface IFactory { Operation CreateOperation(); }                                                  // 工厂方法（接口）

    class FactoryAdd : IFactory { public Operation CreateOperation() { return new OperationAdd(); } }    // 专门负责生产 + 的工厂
    class FactorySub : IFactory { public Operation CreateOperation() { return new OperationSub(); } }    //              -
    class FactoryMul : IFactory { public Operation CreateOperation() { return new OperationMul(); } }    //              *
    class FactoryDiv : IFactory { public Operation CreateOperation() { return new OperationDiv(); } }    //              /

// Main: IFactory operFactory = new FactoryAdd();
//       Operation oper = operFactory.CreateOperation();
//       oper.NumberA = 1;
//       oper.NumberB = 2;
//       double result = oper.GetResult();
}

（阿秋哥 20170714）

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