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 ,