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An Introduction to UML

An Introduction to UML. COMS 103 section 4 11 January, 1999. Overview. What do programmers do? Why is design important? What are the challenges of design? An introduction to UML. What do programmers do?. Assess the existing situation Understand the problem

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An Introduction to UML

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  1. An Introduction to UML COMS 103 section 4 11 January, 1999

  2. Overview • What do programmers do? • Why is design important? • What are the challenges of design? • An introduction to UML

  3. What do programmers do? • Assess the existing situation • Understand the problem • Understand the customer’s vision • Create a model of a solution • Design the details of the solution • Implement the solution • Support and maintain the solution

  4. Why is design important? • A crucial link to the customer. • A map for development and implementation efforts. • Change costs increase throughout the software lifecycle. • Good design prevents coding errors.

  5. Why is design so difficult? • Looking for the forest • Even simple design can be difficult to describe. • Communication with other team members can be complex. • What we need: a standard way of capturing object-oriented software designs. • The current answer: UML

  6. An Introduction to UML • Unified Modeling Language • A graphical method of representing classes and their inter-relationships. • Design-support tools for UML are available

  7. Showing a class in UML ClassName variables methods

  8. Relationships between classes • Associations - either class can exist without the other. • Dependency - a client and a supplier • Aggregate - existence-dependant relationship

  9. Association Department Employee WorksFor N 1

  10. Dependency Department Employee WorksFor N 1 Schedule

  11. Aggregate Employee Dependant N 1

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