Class Diagram Aggregation. Aggregation aggregation is a special type of association that models a whole part relationship between aggregate and its parts. Aggregation says there can be no circular relationships ie.
It is more specific then association. Consider a situation employee object contains many informations such as id name emailid etc. Shared aggregation aggregation is a binary association between a property and one or more composite objects which group together a set of instances.
It contains one more object named address which contains its own informations such as city state country zipcode etc.
Consider a situation employee object contains many informations such as id name emailid etc. Aggregation uses an open diamond. Consider a situation employee object contains many informations such as id name emailid etc. Learn uml faster better and easier.