Learn more about how to build a class diagram without drawing at all using SmartDraw's Class Diagram Extension. The class diagram extension will work with C#, C, Java, JavaScript, Ruby and Python. Simply launch the SmartDraw Class Diagram extension and point it to Github or a local directory, choose which classes you want to include and click Build Diagram to have a class diagram built for you, automatically. You can generate a class diagram automatically using a GitHub repo or a local repository. Generate a Class Diagram Automatically from Data On the other hand, inheritance allows the inheriting class to access both the PUBLIC and PROTECTED functions of the superclass. If you have an aggregation relationship, the aggregate (the whole) can access only the PUBLIC functions of the part class. In real life coding examples, the difference between inheritance and aggregation can be confusing. So the class Honda would have a generalization relationship with the class car. It refers to a relationship between two classes where one class is a specialized version of another. Generalization is another name for inheritance or an "is a" relationship. The diamond ends in both composition and aggregation relationships point toward the "whole" class (i.e., the aggregation). Use a hollow diamond to represent a simple aggregation relationship, in which the "whole" class plays a more important role than the "part" class, but the two classes are not dependent on each other. Illustrate composition with a filled diamond. Composition and AggregationĬomposition is a special type of aggregation that denotes a strong ownership between Class A, the whole, and Class B, its part. For example, one company will have one or more employees, but each employee works for just one company. These symbols indicate the number of instances of one class linked to one instance of the other class. Place multiplicity notations near the ends of an association. Roles represent the way the two classes see each other. Place roles near the end of an association. Use a filled arrow to indicate the direction of the relationship. Place association names above, on, or below the association line. AssociationsĪssociations represent static relationships between classes. Protected visibility, denoted with a # sign, allows child classes to access information they inherited from a parent class. Public visibility, denoted with a + sign, allows all other classes to view the marked information. Private visibility, denoted with a - sign, hides information from anything outside the class partition. Use visibility markers to signify who can access the information contained within a class. Illustrate active classes with a thicker border. Active ClassesĪctive classes initiate and control the flow of activity, while passive classes store data and serve other classes.
Place the name of the class in the first partition (centered, bolded, and capitalized), list the attributes in the second partition (left-aligned, not bolded, and lowercase), and write operations into the third. Illustrate classes with rectangles divided into compartments. Associations represent the relationships between classes. Basic Class Diagram Symbols and Notations ClassesĬlasses represent an abstraction of entities with common characteristics.
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