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                # 接口和抽象的區別 抽象類可以有構造方法 接口不行 抽象類可以有普通成員變量 接口沒有 抽象類可以有非抽象的方法 接口必須全部抽象 抽象類的訪問類型都可以 接口只能是 public abstract **一個類可以實現多個接口 但只能繼承一個抽象類**
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