Q: Which of the following statements regarding abstract classes are true?

A An abstract class can be extended.
B A subclass of a non-abstract superclass can be abstract.
C A subclass can override a concrete method in a superclass to declare it abstract.
D All of the above
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Assess your knowledge of Java interfaces and abstract classes with these multiple choice questions. Learn about the difference between the two concepts and how to use them to create flexible and scalable Java programs. Take the quiz now!