![]() For denoting one element we use 1, for zero elements we use 0, and for many elements we use *. These relations can be one-to-one, many-to-many, and many-to-one or one-to-many. Multiplicity means that number of elements of a class is associated with another class. All of these, share a relationship and these relationships are known as aggregate relationships. Further, for “Account” class, “User” is a superclass. These classes are User, Book, and Librarian as shown in diagram. ![]()
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