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Aggregation
Composition
Aggregation : An association in which one class refers to collection or a another class. This is a part of a whole relationship where the phase can exist without the whole .
e.g.: A line item is whole and the products are the phases. If a line item is deleted then the products have not be deleted .
Composition : An association in which one class refers to another class or a collection. This is a part of a whole relationship where the phase cannot implement without the whole . If the whole is deleted then the parts are deleted. For example: An Order is a whole and the line items are the phase. If an order is removed then all the line items should be deleted as well.
Aggregations are not used to be circular.
In a garbage-collected language like Java, The whole has the responsibility of operating the garbage collector to prematurely collect the part by holding reference to it.
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