Which of the following statements about abstract superclasses is true?
A) abstract superclasses may contain data.
B) abstract superclasses may not contain implementations of methods.
C) abstract superclasses must declare all methods as abstract.
D) abstract superclasses must declare all data members not given values as abstract.

Question

Quizplus · Accepted Answer

Abstract superclasses can contain data, including instance variables with assigned values, and can also contain concrete (implemented) methods alongside abstract methods. They do not need to declare all methods or data members as abstract.

Which of the Following Statements About Abstract Superclasses Is True