* private:只允许在本类中进行访问
* public:允许在任意位置访问
* protected:允许在当前类、同包子类/非子类、跨包子类调用;跨包非子类不允许
* 默认:允许在当前类、同包子类/非子类调用;跨包子类/非子类不允许调用
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* private:只允许在本类中进行访问
* public:允许在任意位置访问
* protected:允许在当前类、同包子类/非子类、跨包子类调用;跨包非子类不允许
* 默认:允许在当前类、同包子类/非子类调用;跨包子类/非子类不允许调用
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