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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                題目: ~~~ public class PackageDemo { private void sayHello() { System.err.println("base:hello"); } public static void main(String[] args) { PackageDemo demo = new Impl(); demo.sayHello(); } } class Impl extends PackageDemo { public void sayHello() { System.err.println("Impl:hello"); } } output===> base:hello ~~~ 當子類位于當前類內部、同一包下、其他包下時訪問權限會發生什么變化呢?是否還遵循表格中的規定呢?對于這個問題,我們只需要記住**最大訪問權限原則**即可,所謂最大訪問權限原則即子類的在不同位置時訪問權限修飾符表現的實際權限以最大的那個為準。依據該原則,子類在不同位置時對父類中的方法及變量的訪問權限如下表所示: | 子類中訪問權限 | 當前類 | 同包 | 其他包 | | --- | --- | --- | --- | | public | √ | √ | √ | | protected | √ | √ | √ | | default | √ | √ | × | | private | √ | × | × | 回到題目中,由于子類Impl與父類Base位于同一包下,而Base中的sayHi()方法的修飾符為private,對子類不可見,因此不滿足方法重寫的要求,因此調用的仍然是Base中的方法,而非子類中的方法
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