Access Specifiers[访问控制符]

ØUsed to expose or hide the details/attributes in a class

§Public

–A declaration that is accessible to all classes

§Protected

–A declaration that is accessible to only to the class itself and its subclasses

§Private

–A declaration that is accessible to only to the class itself

Public 

可以被所有的类访问

Protected

只能被自己和子类访问

Private

只能被自己访问