4.1 分解条件式

【1】原代码

if (date.before(SUMMER_START) || date.after(SUMMER_END))
{
    charge = quantity * _winterRate + _winterServiceCharge;
}
else
{
    charge = quantity * _summerRate;
}

【2】分解条件式

if (notSummer(date))
{
    charge = winterCharge(quantity);
}
else
{
    charge = summerCharge (quantity);
}

double summerCharge(int quantity)
{
    return quantity * _summerRate;
}

double winterCharge(int quantity)
{
    return quantity * _winterRate + _winterServiceCharge;
}

【3】总结

有一个复杂的条件（if-then-else)语句。从if、then、else三个段落中分别提炼出独立函数。

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