4.1 分解条件式

【1】原代码

1 if (date.before(SUMMER_START) || date.after(SUMMER_END))
2 {
3     charge = quantity * _winterRate + _winterServiceCharge;
4 }
5 else
6 {
7     charge = quantity * _summerRate;
8 }

【2】分解条件式

 1 if (notSummer(date))
 2 {
 3     charge = winterCharge(quantity);
 4 }
 5 else
 6 {
 7     charge = summerCharge (quantity);
 8 }
 9 
10 double summerCharge(int quantity)
11 {
12     return quantity * _summerRate;
13 }
14 
15 double winterCharge(int quantity)
16 {
17     return quantity * _winterRate + _winterServiceCharge;
18 }

【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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顺序选择循环总结