In object-oriented vocabulary, utility classes are usually called entity classes.
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Q47: Abstraction makes the distinction between entities.
Q48: To say that somebody is "in a
Q49: An object cannot be an instance of
Q50: The most generalized class is "thing."
Q51: Virtual objects embody the same concepts as
Q53: Attributes and operations of virtual objects are
Q54: The concept of information hiding is closely
Q55: An object provides services through its interface.
Q56: The term "interface" must be reinforced by
Q57: An object cannot consist of more objects.
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