What is the difference between Aggregation and Composition?
[Ans] Aggregation is a specialization of association, specifying a whole-part relationship between two objects. Composition is a stronger form of aggregation where the whole and parts have coincident lifetimes, and it is very common for the whole to manage the lifecycle of its parts. This suggests that in Aggregation a containee can live even if its container no longer exists but in the Composition they are more tightly coupled with each other in the sense that if one dies the other one too dies.
