简单工厂模式加减乘除器

package com.main.cul;
import java.util.Scanner;
import com.factory.Operation;
public class Demo {
    private static double result;
    public static void main(String[] argv){
    
    try{
        
        Scanner in=new Scanner(System.in);
        System.out.print("请输入数字A：");
        double numA=in.nextDouble();
        
        System.out.print("请选择操作+-*/(加减乘除)：");
        String strOper=in.next();
        char  operate=strOper.charAt(0);
        
        System.out.print("请输入数字B：");
        double numB=in.nextDouble();
        System.out.println("您输入的数字A："+numA);
        System.out.println("您输入的操作："+operate);
        System.out.println("您输入的数字B："+numB);
        Operation oper=OperationFactory.createOperate(operate);
        Demo.result=oper.getResult(numA,numB);
        System.out.print("结果为"+result);
        
    }catch (Exception e) {
        // TODO: handle exception
        e.printStackTrace();
    }
    }
}

工厂类

package com.main.cul;

import com.factory.AddOper;
import com.factory.DivOper;
import com.factory.MulOper;
import com.factory.Operation;
import com.factory.SubOper;



public abstract class  OperationFactory {

    public static Operation createOperate(char ope){
        Operation oper =null;
        switch (ope) {
        case '+':
            oper =new AddOper(); 
            break;
        case '-':
            oper =new SubOper(); 
            break;
        case '*':
            oper =new MulOper(); 
            break;
        case '/':
            oper =new DivOper(); 
            break;
        }
        return oper;}
}

加减乘除类：

package com.factory;

public abstract class Operation {
    protected double numA;
    protected double numB;
    protected double result;
    public abstract double getResult(double numA, double numB);
}

package com.factory;

public class AddOper extends Operation {

    public double getResult(double numA,double numB){
        result=numA+numB;
        return result;
        
    }
}

package com.factory;
public class SubOper extends Operation {
    public double getResult(double numA,double numB){
        result=numA-numB;
        return result;
        
    }
}

package com.factory;
public class MulOper extends Operation {
    public double getResult(double numA,double numB){
        result=numA*numB;
        return result;
        
    }
}

package com.factory;
public class DivOper extends Operation {
    public double getResult(double numA,double numB){
        if(numB==0){
            
            System.out.print("除数不能为0");
        }
        result=numA/numB;
        return result;
        
    }
}