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參考: https://ithelp.ithome.com.tw/articles/10191955 https://wadehuanglearning.blogspot.com/2017/08/php‐oo.html 22

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擴展的定義就是增加新需求 也就是說 新個需求應該由新的程式碼擴充出來 對修改封閉就是現有的程式碼不做變動(除了BUG) 參考: https://ithelp.ithome.com.tw/articles/10192105?sc=iThelpR 25

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LSP 的重點主要是在說繼承時的注意事項,設計class時要想到這方法真的是所有 繼承的class都會用到嗎? 範本參考資料: https://ithelp.ithome.com.tw/articles/10192317 27

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參考 https://medium.com/@f40507777/%E4%BB%8B%E9%9D%A2%E9%9A%94%E9%9B%A2 %E5%8E%9F%E5%89%87‐interface‐segregation‐principle‐isp‐6854c5b3b42c https://ithelp.ithome.com.tw/articles/10192317 32

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https://notfalse.net/1/dip 參考 高階與低階,是相對關係,其實也就是 呼叫者 (Caller) 與 被呼叫者 (Callee), 抽象,是指 介面 (interface) 或是 抽象類別 (Abstract Class), 39

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高階 People 低階 AsusPhone 40

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