Modifier
To class contains:
private: Just for the class of which defined it.
default: For the class of which defined it and the class that in the same package.
protected: For the class of which definded it and the class that in the same package and the class inherited from it.
public: Anywhere can get it and use it.
Tip:
When A class extend B class and B contain private members, A has the private members that inherited from B, but cannot use them.
To class:
Only public and default can use.
public: anywhere
default: must in the same package
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