Private means this could only be seen within this class.
Protected means "package private", this could be seen by subclasses and package members.
本文深入解析类成员的访问控制机制,详细解释了Private和Protected两种访问修饰符的区别及其应用场景。
Private means this could only be seen within this class.
Protected means "package private", this could be seen by subclasses and package members.

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