简单工厂模式_计算器实现

计算器程序的简单工厂模式实现


Operation.java

package com.calculator;



public abstract class Operation {//抽象类



    private double _numberA = 0;

    private double _numberB = 0;



    public double get_numberA() {

        return _numberA;

    }



    public void set_numberA(double _numbera) {

        _numberA = _numbera;

    }



    public double get_numberB() {

        return _numberB;

    }



    public void set_numberB(double _numberb) {

        _numberB = _numberb;

    }

    

    public abstract double GetResult();



}

-----------------


OperationAdd.java

package com.calculator;



public class OperationAdd extends Operation{



    @Override

    public double GetResult() {

        // TODO Auto-generated method stub

        double result = 0;

        result = get_numberA() + get_numberB();

        return result;

    }



}





class OperationSub extends Operation{



    @Override

    public double GetResult() {

        // TODO Auto-generated method stub

        double result = 0 ;

        result = get_numberA() - get_numberB();

        return result;

    }

    

}





class OperationMul extends Operation{



    @Override

    public double GetResult() {

        // TODO Auto-generated method stub

        double result = 0 ;

        result = get_numberA() * get_numberB();

        return result;

    }

    

}





class OperationDiv extends Operation {



    @Override

    public double GetResult() {

        // TODO Auto-generated method stub

        double result = 0 ;

        if(get_numberB() == 0)

            try {

                throw new Exception("除数不能为0");

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

        result = get_numberA() / get_numberB();

        return result;

    }

    

}

---------


OperationFactory.java

package com.calculator;



public class OperationFactory {

    

    public static Operation createOperate(char operate){

        

        Operation operation = null;

        

        switch(operate){

        case '+':

            operation = new OperationAdd();

            break;

        case '-':

            operation = new OperationSub();

            break;

        case '*':

            operation = new OperationMul();

            break;

        case '/':

            operation = new OperationDiv();

            break;

        }

        return operation;

    }

    

    



}

-------------

CustClient.java

package com.calculator;



public class CustClient {

    

    public static void run(){

        Operation  oper ;

        oper = OperationFactory.createOperate('/');

        oper.set_numberA(1);

        oper.set_numberB(2);

        double result = oper.GetResult();

        System.out.println(result);

    }

    

    

    public static void main(String [] args){

        CustClient.run();

    }



}