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                **導語:設計原則是設計模式的評判標準。面向對象的設計原則有七個,包括:開閉原則、里氏替換原則、迪米特原則(最少知道原則)、單一職責原則、接口分隔原則、依賴倒置原則、組合/聚合復用原則。 七大原則之間并不是相互孤立的,彼此間存在著一定關聯,一個可以是另一個原則的加強或是基礎。違反其中的某一個,可能同時違反了其余的原則。**
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