Consider Classes A, B and C, Where a Is an Abstract

question 14

Multiple Choice

Consider classes A, B and C, where A is an abstract superclass, B is a concrete class that inherits from A and C is a concrete class that inherits from B. Class A declares abstract method originalMethod, implemented in class B. Which of the following statements is true of class C?

• A) Method originalMethod cannot be overridden in class C-once it has been implemented in concrete class B, it is implicitly final.
• B) Method originalMethod must be overridden in class C, or a compilation error will occur.
• C) If method originalMethod is not overridden in class C but is called by an object of class C, an error occurs.
• D) None of the above.

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Definitions:

Glycine

The simplest amino acid with the formula NH2CH2COOH, used in the biosynthesis of proteins.

Alanine

A nonessential amino acid used by the body to build proteins and involved in metabolism.

Aspartic Acid

An amino acid with the formula C4H7NO4, important in the biosynthesis of proteins.

Histidine

An essential amino acid important in many proteins, playing a key role in enzymes and the buffering of pH in blood.