UML Summary

Unified Modeling Language (UML)

• Learning Goals:

  • Understand UML class and package notation.

  • Represent class relationships: inheritance, aggregation, dependency.

  • Sequence and activity diagrams.

• Class Design:

  • Example attributes:

  • $numCanisters: int$

  • $numWafers: int$

  • $size: float$

• Class Responsibilities:

  • Operations: display(), getNumOpenSlots(), setStatus().

• Packages:

  • UML representation of classes within packages.

• Class Relationships:

  • Association: E.g., Employer and Employee classes.

  • Multiplicity: $1..3$ and $1..*$.

  • Aggregation: One class contains another; e.g., Company and EmployeeDirectory.

  • Composition: Stronger inclusion, destroyed with the containing object.

  • Dependency: Use of one class within another, e.g., a parameter reference.

• Sequence Diagrams:

  • Illustrate interactions through user actions; e.g., checkout process.

• Activity Diagrams:

  • Depicts state transitions and actions; useful for showing workflow.

• Class Models:

  • Sequence of method calls; object states based on events across classes.

• Data Flow in UML:

  • Model processes and data exchanges between components.