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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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  2. oop - What is the difference between association, …

    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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  4. Difference between Association and Aggregation

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      What is aggregation in OOP?Aggregation In scenarios where one class uses another class as the data type of its attributes, aggregation (a.k.a composition) as a construct is involved. Aggregation represents a whole-part relationship between objects in OOP. It is often referred to as a “has-a” relationship, as one object has another object as a part of its state.
      What is the difference between Association and aggregation?An association is used when one object wants another object to perform a service for it. Aggregation is a special case of association. A directional association between objects. When an object ‘has-a’ another object, then you have got an aggregation between them. eg: Room has a table, but the table can exist without the room. class Room {
      What is the difference between direct association and Aggregate Association?Note: Both Direct associations and Aggregation associations are often generalized as "Associations". The difference is rather subtle. The name for "Composition association" is Composite Agregation. And what you call "Aggregation association" is a Shared Compostion and per UML2.5 has no defined semantics. Please see the box on. p 110.
      What is the difference between Association and aggregation in UML?Association is: Class A uses Class B. Example: Employee uses Bus/train Services for transportation. And in In UML diagram Association is denoted by a normal arrow head. 2. Aggregation Class A contains Class B, or Class A has an instance of Class B. An aggregation is used when life of object is independent of container object.
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