版权声明:不自见故明;不自是故彰;不自伐故有功;不自矜故长; https://blog.csdn.net/LightUpHeaven/article/details/84750148
9.1.分解条件表达式(Decompose Conditional)
9.2.合并条件表达式(Consolidate Conditional Expression)
9.3.合成重复的条件片段(Consolidate Duplicate Conditional Fragments)
9.4.移除控制标记(Remove Control Flag)
9.5.以卫语句取代嵌套条件表达式(Replace Nested Conditional with Guard Clauses)
9.6.以多态取代条件表达式(Replace Conditional with Polymorphism)
9.7.引入Null对象(Introduce Null Object)
9.8.引入断言(Introduce Assertion)