Shulou(Shulou.com)06/03 Report--

Protected-decorated methods and properties can only be seen within the package or outside the subclass. Note in the main inside the subclass, the protected method and property of the parent class can only be called with the subclass instance, not with the parent class instance or parent class reference (the reference quilt subclass instance assignment is not allowed) to call the protected method and property.

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