A summary of UML class diagram relationships

In UML class diagrams, the following relationships are common:

• Generalization (generalization)
• Implementation (Realization)
• Association (Association)
• Aggregation (Aggregation)
• Combination (composition)
• Dependency (Dependency)

The order of strength of the various relationships:

Generalization = implementation > Composition > Aggregation > Association > dependencies

First, generalization (generalization):

The inheritance relationship between classes is generalized.

Arrow pointing to: Solid line with triangular arrows, arrow pointing to Parent class

II. Realization (realization)

class implements the relationship of the interface using the implementation.

Arrow pointing: Dashed line with triangular arrows, arrow pointing to Interface

III. Association (Association)

The owning relationship between classes is associated with.

Arrows and points: solid lines with normal arrows, pointing to the owner

Iv. polymerization (Aggregation)

Aggregation is a weak whole and part of the relationship, the whole can be separated from the partial and exist alone.

"Arrows and points": solid lines with hollow diamonds, diamonds pointing to the whole

Five, combination (composition)

The combination is a strong whole and part of the relationship, the whole can not be separated from part of the existence.

Arrows and points: solid lines with solid diamonds, diamonds pointing to the whole

Vi. Dependence (Dependency)

Dependency is a relationship that is used.

Arrows and points: dashed lines with arrows pointing to the user

7. Summary

A complete UML class diagram.

A summary of UML class diagram relationships