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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.
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WEBMay 20, 2009 · As others said, an association is a relationship between objects, aggregation and composition are types of association. From an implementation point of view, an aggregation is obtained by having a …
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WEBMar 15, 2023 · Aggregation describes a special type of an association which specifies a whole and part relationship. Association is a …
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WEBNov 19, 2018 · Aggregation is a specialized form of association between two or more objects in which each object has its own life cycle but there exists an ownership as well. Aggregation is a typical...
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WEBJan 3, 2023 · Learn the difference between association, aggregation and composition in Java with source code, examples and real-life usecases.
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WEBJan 16, 2024 · In Java, we can model association the same way as aggregation: class Child {} class Mother { List<Child> children; } But wait, how can we tell if a reference means aggregation or association? Well, …
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