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For two objects, Foo and Bar the relationships can be defined
Association - I have a relationship with an object. Foo uses Bar
public class Foo {private Bar bar;};NB: See Fowler's definition - the key is that Bar is semantically related to Foo rather than just a dependency (like an int or string).
Composition - I own an object and I am responsible for its lifetime. When Foo dies, so does Bar
public class Foo {private Bar bar = new Bar();}Aggregation - I have an object which I've borrowed from someone else. When Foo dies, Bar may live on.
Content Under CC-BY-SA license UML Association vs Aggregation vs Composition
Aggregation and composition are subsets of association that indicate a part-of relationship between classes. Aggregation implies that the child can exist independently of the parent, while composition implies that the child …
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May 20, 2009 · In their definitions, the distinction between an "aggregation" and a "composition" is based on the fact if it allows sharing a part between two or …
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Jul 25, 2024 · Composition means one object is contained in another object. It is a special type of aggregation (i.e. Has-a relationship), which implies one object is the owner of another object, which can be called an ownership …
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