A class is a concept, abstraction, or thing that makes sense in an application context.

More Questions from Object-Oriented Data Modeling

• An operation that alters the state of an object is known as a constructor operation.
• In UML, a class is represented by a rectangle with three compartments separated by vertical lines.
• When a business rule involves three or more graphical symbols, you can show the constraint as a note and attach the note to each of the symbols by a dashed line.
• A solid diamond represents a stronger form of aggregation, known as composition.
• In an object diagram, an object is represented as a rectangle with two compartments.
• The reasons for overriding include extension, restriction, and optimization.
• An aggregation is a stronger form of association relationship and is represented with a solid diamond at the aggregate end.
• Each association has two or more roles.

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