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Class Diagram Eng .Riham Mqat

Class Diagram Eng .Riham Mqat. Class diagram. 1. Class diagram is a way of showing system classes and the relations among them. 2. Static diagrams, pick only existence and relationships but not actions. Representing a class. Class name Attributes Operations(methods). Attributes.

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Class Diagram Eng .Riham Mqat

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  1. Class DiagramEng .Riham Mqat

  2. Class diagram 1. Class diagram is a way of showing system classes and the relations among them. 2. Static diagrams, pick only existence and relationships but not actions.

  3. Representing a class • Class name • Attributes • Operations(methods)

  4. Attributes Syntax: attributeName : type Ex: firstName : String salary : Dollars

  5. Methods Syntax: methodName(parm) : return type Ex: setName(String) getSalary() : Dollars

  6. Representing a class

  7. Visibility • You can show the visibility of attributes and methods by these signs + : public - : private # : protected ~ : package

  8. Classes Relationships • Association • Aggregation • Composition • Generalization • Multiplicity

  9. Association • if there is a conceptual connection between two classes we say that these classes are associated.

  10. Multiplicity • An indication of numerical limit of a relation.

  11. Aggregation & Composition • Both describe the relation between a whole and its parts. • To test if you are dealing with aggregation or composition check : • If the part belong only to one whole then its • composition.

  12. Example:

  13. Aggregation & Composition • Aggregation • Composition • The diamond sign is always at the side of the whole.

  14. Generalization • A way of describing inheritance in Class Diagram.

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