【1】原代码

1 if (date.before(SUMMER_START) || date.after(SUMMER_END))2 {3     charge = quantity * _winterRate + _winterServiceCharge;4 }5 else6 {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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