Object Associations: Aggregation and Containment

Hi Henry,

1.Containment describes the idea of one class having a data member that is an object of another type.i.e You can create a class which can use a object of another class.
for e.g:-Delegation expresses the idea that one class uses another class to accomplish a task or goal. Delegation is usually accomplished by containment.

2.Aggregation is a specialize form of Association where all object have their own lifecycle but there is ownership and child object can not belongs to another parent object. Let's take an example of Department and teacher. A single teacher can not belongs to multiple departments, but if we delete the department teacher object will not destroy. We can think about "has-a" relationship.

Thanks,
Pravin.

1 Reply

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Pravin More14y ago
Hi Henry,
1.Containment describes the idea of one class having a data member that is an object of another type.i.e You can create a class which can use a object of another class.
for e.g:-Delegation expresses the idea that one class uses another class to accomplish a task or goal. Delegation is usually accomplished by containment.
2.Aggregation is a specialize form of Association where all object have their own lifecycle but there is ownership and child object can not belongs to another parent object. Let's take an example of Department and teacher. A single teacher can not belongs to multiple departments, but if we delete the department teacher object will not destroy. We can think about "has-a" relationship.

Thanks,
Pravin.