intro
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public: accessible both outside and inside class -
protected & private: only accessible inside class itself and its subclasses -
protected: can be called with an explicit receiver -
private: can only called by implicit self
public : accessible both outside and inside classprotected & private : only accessible inside class itself and its subclassesprotected : can be called with an explicit receiverprivate : can only called by implicit self本文标题：Ruby: Access Control
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