当前位置:编程学习 > php >>

fputcsv命令,写csv文件,遇到的小问题

Move Method

概述

程序中,有个函数与其所驻class之外的另一个class进行更多交流,调用后者或被后者调用

动机(Motivation)

如果一个class有太多行为,或如果一个class与另一个class有太多合作而形成高度耦合(highly coupled),我们就会搬移函数。通过这种手段,我们可以使系统中的classes更简单,这些classes最终也将更干净利落地实现系统交付的任务。

示例

  public class MoveMethod
    { 
        private AccountType _type;
        private int _daysOverdrawn;
        public double OverDraftCharge()
        {
            if (_type.IsPremium())
            {
                double result = 10;
                if (_daysOverdrawn > 7)
                    result += (_daysOverdrawn - 7) * 0.85;
                return result;
            }
            else
                return _daysOverdrawn * 1.75;
        }
        public double BankCharge()
        {
            double result = 4.5;
            if (_daysOverdrawn > 0)
                result += OverDraftCharge();
            return result;
        }
    }

    public class AccountType
    {
        public bool IsPremium()
        {
            return true;
        }
    }

 

 

改为

    public class MoveMethod
    {
        private AccountType _type;

        public double BankCharge()
        {
            double result = 4.5;
            if (_type._daysOverdrawn > 0)
                result += _type.OverDraftCharge();
            return result;
        }
    }

    public class AccountType
    {
        private int _daysOverdrawn;

        public int DaysOverdrawn
        {
            get { return _daysOverdrawn; }
            set { _daysOverdrawn = value; }
        }

        public bool IsPremium()
        {
            return true;
        }

        public double OverDraftCharge()
        {
            if (IsPremium())
            {
                double result = 10;
                if (_daysOverdrawn > 7)
                    result += (_daysOverdrawn - 7) * 0.85;
                return result;
            }
            else
                return _daysOverdrawn * 1.75;
        }
    }

 

 

Move Field(搬移值域)

概述

在target class建立一个new field,修改source field的所有用户,令它们改用new field。

动机(Motivation)

对于一个field(值域),在其所驻class之外的另一个class中有更多函数使用了它,我就会考虑搬移这个field。

示例

    public class MoveMethod
    {
        private AccountType _type;
        private double _interestRate;
        public double InterestForAmountDay(double amount,int days)
        {
            return _interestRate * amount * days / 365;
        }
    }

    public class AccountType
    {

    }

 

 

改为

    public class MoveMethod
    {
        private AccountType _type;

        public double InterestForAmountDay(double amount, int days)
        {
            return _type.InterestRate * amount * days / 365;
        }
    }

    public class AccountType
    {
        private double _interestRate;
        public double InterestRate
        {
            get { return _interestRate; }
            set { _interestRate = value; }
        }
    }
补充:Web开发 , php ,
CopyRight © 2022 站长资源库 编程知识问答 zzzyk.com All Rights Reserved
部分文章来自网络,