Explain a class diagram. Also, explain how a class diagram is like a data flow diagram (DFD).
What will be an ideal response?
A class diagram shows the object classes and relationships involved in a use case. Like a DFD, a class diagram is a logical model, which evolves into a physical model and finally becomes a functioning information system. In structured analysis, entities, data stores, and processes are transformed into data structures and program code. Similarly, class diagrams evolve into code modules, data objects, and other system components.?In a class diagram, each class appears as a rectangle, with the class name at the top, followed by the class’s attributes and methods. Lines show relationships between classes and have labels identifying the action that relates the two classes. To create a class diagram, you review the use case and identify the classes that participate in the underlying business process.?The class diagram also includes a conceptcalled cardinality, which describes how instances of one class relate to instances of another class. For example, an employee might have earned no vacation days or one vacation day or many vacation days. Similarly, an employee might have no spouse or one spouse.
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Answer the following statement true (T) or false (F)
____ tasks include the addition of titles, credits, scene transitions, special visual effects, and sound effects.
A. Quality assurance B. Agile development C. Post-production D. Business analysis
Answer the following statements true (T) or false (F)
1) The sequential file organization is the only one that is easily stored on tape as well as disk. 2) A partial index contains one entry for every record in the main file. 3) A file directory contains information about the files, including attributes, location, and ownership. 4) A file directory contains information about the files, including attributes, location, and ownership. 5) A file allocation table (FAT) is used to keep track of the portions assigned to a file.
To avoid a mistake when using an update query that includes making calculations on a field, what is one thing you can do to prevent losing the original information?
A) Add an additional field with the original figures. B) When you run the query, just undo if you question the new figures. C) Rerun the query to make sure the figures have updated. D) Backup the database after you have run the query.