If a programmer writes a class wanting it to be extended by another programmer, then this programmer must
A) change private methods and instance data to be protected
B) change public methods and instance data to be protected
C) change all methods to be protected
D) change the class to be protected
E) none of the above, the programmer does not have to change anything

Question

Quizplus · Accepted Answer

A) Protected items are accessible by any subclass of the class that defines them while private items cannot be accessed by any other class. Therefore, previously defined private items must now be protected. Previously defined public entities should remain public so that all other classes can still access those public entities. Previously defined private items should not be made public because this would allow all classes to access them rather than just child classes.

If a Programmer Writes a Class Wanting It to Be