Composition
Composition
- Definition: Composition is a strong association where the child cannot exist independently of the parent.
- Ownership: The parent object is responsible for the lifecycle of its child objects. The child objects do not exist without the parent.
- Lifecycle: If the parent object is destroyed, the child objects are also destroyed.
Example: A House contains Rooms. If the House is destroyed, the Rooms are also destroyed.
classDiagram
class House {
+Room[] rooms
}
class Room {
}
House "1" *-- "0..*" Room : Composition
In Mermaid Composition:
- Represented by a filled diamond (
*--). - Indicates a "part-of" relationship where the parent strictly owns the child, and the child cannot exist without the parent.
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