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                依賴倒置(dependence inversion principle),針對依賴的,**要面向接口編程,不要面向實現編程** 1. 高層模塊不應該依賴低層模塊,都應該依賴其抽象 2. 抽象不依賴細節 3. 細節應該依賴抽象 **每一個邏輯的實現都是由原子邏輯組成的,不可分割的原子邏輯就是低層模塊,原子邏輯的再組裝就是高層模塊** **抽象**就是指接口或抽象類,兩者都是不能直接被實例化的; **細節**就是實現類,實現接口或繼承抽象類而產生的類就是細節 依賴發生于高層,通過抽象(接口)構建依賴 ![](https://img.kancloud.cn/52/2a/522abc47b3eb686363368d4ca01d6aec_926x422.png)
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