A Tiny Cheat Sheet for Composition, Aggregation and Association

A Tiny Cheat Sheet for Composition, Aggregation and Association

 

Composition ↔ Dependent lifecycles AND Ownership

Example: Car AND Engine

 

Aggregation ↔ Independent lifecycles AND Ownership

Example: Department AND Full-Time Professors

 

Association ↔ Independent lifecycles AND No Ownership

Example: Professors AND Students