The term "interface" must be reinforced by the qualifier "private."
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Q51: Virtual objects embody the same concepts as
Q52: In object-oriented vocabulary, utility classes are usually
Q53: Attributes and operations of virtual objects are
Q54: The concept of information hiding is closely
Q55: An object provides services through its interface.
Q57: An object cannot consist of more objects.
Q58: The relationship of one object to its
Q59: "Literature" is an abstract class because we
Q60: Polymorphism is closely related to inheritance.
Q61: Smalltalk is one of the earlier object-oriented
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