From java-awt:

I'm trying to subclass java.awt.Polygon in order to add scale(), rotate(), and
set(). After I finish manipulating the Polygon, I need to update the bounds.
The easiest way to do this would be to call calculateBounds(), but because it's
friendly instead of protected the only way I can do this is to

1) set my class' package as java.awt and use super.calculateBounds().
   If I understand packages correctly, this is bad because my class _isn't_ part
   of AWT. (On the other hand, if scale(), rotate(), and set() were part of
   java.awt.Polygon I wouldn't need to subclass. :)

or

2) cut-and-paste the code from java.awt.Polygon, which is what I did. As OO
   design goes, this is terrible.

It seems like calculateBounds() should be protected.