工厂方法模式案例

题目：

请使用工厂方法模式实现一个计算器控制台应用程序，包含加、减、乘、除四种运算，要求输入2个数和运算符，输出相应的结果。并画出相应的UML类图？

类图：

工厂方法模式案例

代码：

abstract class Operation {
   private double numberA, numberB;

   public double getNumerA() {
       return numberA;
   }

   public void setNumberA(double numberA) {
       this.numberA = numberA;
   }

   public double getNumerB() {
       return numberB;
   }

   public void setNumberB(double numberB) {
       this.numberB = numberB;
   }

   public abstract double GetResult();

};

class OperationAdd extends Operation {
   public double GetResult() {
       return getNumerA() + getNumerB();
   }
};

class OperationSub extends Operation {
   public double GetResult() {
       return getNumerA() - getNumerB();
   }
};

class OperationMul extends Operation {
   public double GetResult() {
       return getNumerA() * getNumerB();
   }
};

class OperationDiv extends Operation {
   public double GetResult() {
       return getNumerA() / getNumerB();
   }
};

class OperationSqrt extends Operation {
   public double GetResult() {
       return Math.sqrt(getNumerA());
   }
};

interface FactoryOper {
   Operation createOperation();
};

class AddFactory implements FactoryOper {
   public Operation createOperation() {
       return new OperationAdd();
   }
};

class SubFactory implements FactoryOper {
   public Operation createOperation() {
       return new OperationSub();
   }
};

class MulFactory implements FactoryOper {
   public Operation createOperation() {
       return new OperationMul();
   }
};

class DivFactory implements FactoryOper {
   public Operation createOperation() {
       return new OperationDiv();
   }
};

class SqrtFactory implements FactoryOper {
   public Operation createOperation() {
       return new OperationSqrt();
   }
};

public class FactoryMethod {
   public static void main(String[] args){
       FactoryOper operFactory = new MulFactory();
       Operation oper = operFactory.createOperation();
       oper.setNumberA(4);
       oper.setNumberB(2);
         double result = oper.GetResult();
         System.out.println("结果为"+result);
   }
}

结果：

工厂方法模式案例