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Class diagrams

Class diagrams. Terézia Mézešová. Class diagram. static diagram, part of UML describing classes structure of system shows classes, their attributes and methods and relationships between classes classes represent main interactions in system and classes to be programmed. Classes. name

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Class diagrams

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  1. Class diagrams Terézia Mézešová

  2. Class diagram • static diagram, part of UML describing classes structure of system • shows classes, their attributes and methods and relationships between classes • classes represent main interactions in system and classes to be programmed

  3. Classes • name • attributes • methods • abstract classes have name in italics

  4. Attribute and method syntax • visibility name : data_type • visibility name ( parameter_name : parameter_type, ... ) • visibility: • +   public • -    private • #   protected • /   derived • _   static

  5. Relationships class level: • generalization • realization instance level: • association • aggregation • composition

  6. Generalization • "is a" relationship, inheritance • instance of subtype is also instance of superclass

  7. Realization • one element realizes the behavior of second element • e.g. relationship between classes and interfaces showing that the class realizes methods offered by the interface

  8. Association • represents static relationship between objects of two classes

  9. Aggregation • "has a" relationship • type of association relationship • can only involve two classes

  10. Composition • "owns a" relationship • stronger than aggregation • if the container class is destroyed, all contained classes must be destroyed as well

  11. Other types of relationships • dependency - one class uses another at some point • multiplicity: • 0..1 - no or one instance • 1 - exactly one instance • 0..* - zero or more instances • 1..* - at least one or more instances

  12. Thank you for your attention

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