Multiple choice technology

Which of the following is not true

  1. Classes that end in “-” must be abstract

  2. Abstract classes should not have instances

  3. Concrete classes must belong to a class group

  4. A class group must always have at least one key
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The statement about concrete classes requiring class groups is not universally true. While Work-derived concrete classes need class groups for database mapping, Data- classes and other concrete class types do not. Classes ending in "-" are abstract by convention, and abstract classes indeed should not have instances.

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