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### 对于成员变量和方法的作用域,public,protected,private以及不写之间的区别。
- public :表明该成员变量或者方法是对所有类或者对象都是可见的,所有类或者对象都可以直接访问
- private:表明该成员变量或者方法是私有的,只有当前类对其具有访问权限,除此之外其他类或者对象都没有访问权限.子类也没有访问权限.
- protected:表明成员变量或者方法对类自身,与同在一个包中的其他类可见,其他包下的类不可访问,除非是他的子类
- default:表明该成员变量或者方法只有自己和其位于同一个包的内可见,其他包内的类不能访问,即便是它的子类
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