UML Class Diagram Arrows Flashcards

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Association Class

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A line between classes, optionally with a closed arrow indicating navigability.

A dashed line with a closed arrow pointing towards the class being depended upon.

A class that is also an association, represented by a dashed line connected to an association line.

An open arrow pointing from the subclass to the superclass.

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Indicates a 'has-a' relationship where the linked class can exist independently of the container class.

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Indicates a strong 'owns' relationship where the linked class cannot exist independently of the container class.

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Association:
- Represented by a simple line, may include a closed arrow.
- Indicates a relationship between classes.
Dependency:
- Shown as a dashed line ending with a closed arrow.
- Indicates that one class relies on another, suggesting a weaker relationship.
Association Class:
- Illustrated with a dashed line connecting classes to the association class.
- Allows additional properties to be associated with an association.
Inheritance:
- Depicted with an open arrow.
- Represents a parent-child relationship between classes, where the child inherits attributes and methods from the parent.
Aggregation:
- Illustrated by an open diamond at the parent class end of the line.
- Signifies a whole-part relationship, where the part can exist independently of the whole.
Composition:
- Represented by a closed diamond at the parent class end of the line.
- Indicates a strong whole-part relationship, where the part's lifecycle is dependent on the whole.