| Rule: |
| A subclass inherits all of the member variables within its superclass that are accessible to that subclass (unless the member variable is hidden by the subclass). |
| That is, subclasses |
| 1. inherit those member variables declared as public or protected |
| 2. inherit those member variables declared with no access specifier as long as the subclass is in the same package as the superclass. These variables are sometimes known as "friendly". |
| 3. don't inherit a superclass's member variable if the subclass declares a member variable using the same name. The subclass's member variable is said to hide the member variable in the superclass. |
| 4. don't inherit private member variables |
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