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                ### Parallel Inheritance Hierarchies(平行繼承體系) Parallel Inheritance Hierarchies其實是shotgun surgery的特殊情況。在這種情況下,每當你為某個class增加一個subclass,必須也為另一個class相應增加一個subclass。如果你發現某個繼承體系的名稱前綴和另一個繼承體系的名稱前綴完全相同,便是聞到了這種壞味道。 消除這種重復性的一般策略是:讓一個繼承體系的實體(instance)指涉(參考、引用、refer to)另一個繼承體系的實體(instances)。如果再接再厲運用Move Method 和 Move Field,就可以將指涉端( referring class )的繼承體系消弭于無形。
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