Types of relationships in UML class diagram
- Dependencies
- Generalizations
- Associations
Dependencies
- Indicates semantic relationship btw two classes
Generalizations
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Connects a sub class to it’s super class (Inheritance basically)
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Reverse is called specialization
Note
Association
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A communication btw two classes
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We can name the association
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We can use dual association,
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We can define navigatability,
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Association can be objects themselves (association or link classes)
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Self association is possible
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Composition and Aggregation are sub types
Aggregation
- Indicates a “part-whole” relationship
- Denoted by a hallow diamond
Composition
- Indicates strong ownership (stronger form of aggregation)
- Life time of the part is intertwined on the lifetime of the whole
- Denoted by a filled diamond
Summary
