面向对象注意事项

酷酷的东西很受人的欢迎，但实用的东西更受用终生，对于程序员来说，冗长的代码让程序员苦不堪言，相对来说，简单的代码维护起来更加容易，多从用户的角度出发，让你的程序更加的出色。这是我的bug,值得一记。

package com.first;

import java.util.Scanner;

public class test {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
//要循环运行一个系统，占内存，没有关流，不能造成浪费
       one result=new one();

Scanner sc=new Scanner(System.in);

System.out.println("请输入整数数据：");

double dCountFirstNum=sc.nextDouble();

double dCountTwotNum=sc.nextDouble();

       result.dCountAdd(dCountFirstNum, dCountTwotNum);
       System.out.println("加："+result.dCountAdd(dCountFirstNum, dCountTwotNum));

       result.dCountDecrease(dCountFirstNum, dCountTwotNum);
       System.out.println("减 "+result.dCountDecrease(dCountFirstNum, dCountTwotNum));

       result.dCountMul(dCountFirstNum, dCountTwotNum);
       System.out.println("乘 "+result.dCountMul(dCountFirstNum, dCountTwotNum));


       if( dCountTwotNum==0){
           System.out.println("这是分母，注意哦");

           System.out.println("需要重新输入");
           dCountTwotNum=sc.nextInt(); //数据类型有误，输入非整型，
       }

       result.dCountDivsion(dCountFirstNum, dCountTwotNum);
       System.out.println("除 "+result.dCountDivsion(dCountFirstNum, dCountTwotNum));

   }

}

package com.first;

public class one {

   public double dCountAdd(double dCountFirstNum, double dCountTwotNum){

       return dCountFirstNum + dCountTwotNum;
   }


   public double dCountDecrease(double dCountFirstNum, double dCountTwotNum){

       return dCountFirstNum - dCountTwotNum;
   }


   public double dCountMul(double dCountFirstNum, double dCountTwotNum){

       return dCountFirstNum* dCountTwotNum;
   }


   public double dCountDivsion(double dCountFirstNum, double dCountTwotNum){

       return dCountFirstNum / dCountTwotNum;
   }
}

面向对象注意事项

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