Aggregation
Aggregation
- Definition: Aggregation is a weak association where the child can exist independently of the parent.
- Ownership: The parent object can contain or own a collection of child objects, but those child objects can exist independently of the parent.
- Lifecycle: If the parent object is destroyed, the child objects can continue to exist.
Example: A Library contains Books. If the Library is destroyed, the Books still exist.
classDiagram
class Library {
+Book[] books
}
class Book {
}
Library "1" o-- "0..*" Book : Aggregation
- In Mermaid Aggregation:
- Represented by an open diamond (
o--). - Indicates a "has-a" relationship where the parent can own the child, but the child can exist independently.
- Represented by an open diamond (
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