READING
CHAPTER 13
SECTION 3
"Inheritance and Member Accessibility"

- rules apply equally to all members:
  - instance variables
  - class variables
  - instance methods
  - class methods
- the inherited components of the superclass are part of the subclass instance
- visibility modifiers
  - public
    - accessible from any object or class
    - regardless of inheritance
  - private
    - never accessible from any outside object or class
    - not inherited
  - protected
    - accessible only to the methods that 
      - belong to the same class
      - belong to descendent classes
- from the outside, only public members are accessible, whether they are
  - defined for the class
  - inherited
- accessibility of members from a descendent
  - can access public and protected members of its ancestors
  - cannot access anyone else's private members, regardless of relationship
  - applies to both accessing your own members, 
    and to accessing members of another object of your class
- a class cannot access its descendent's protected methods
- only the public members of an object are accessible from another object 
  if the two objects belong to different classes (regardless of inheritance)
- package visibility
  - default visibility
  - component is accessible from any method of a class that belongs to the 
    same package as the component's class

Quick Check
1. No, since X is private, it is only accessible to Super
2. Yes, if X is a protected member of the Super class, X of one instance of Super 
   is accessible from another instance of Super.  However, since an instance of a 
   subclass belongs to a different class, X would not be accessible from an 
   instance of a subclass of Super.