When one object is responsible for the lifecycle management of another object, this relationship is known as composition. Composition represents a “has-a” type relationship. Compositions are a critical building block of many basic data structures, including the tagged union, the linked list, and the binary tree, as well as the object used in object-oriented programming. In UML, composition is depicted as a filled diamond and a solid line. It always implies a multiplicity of 1 or 0..1, as no more than one object at a time can have lifetime responsibility for another object. In an “is a” relationship, the derived class is clearly a kind of the base class.

Copyright © 2009-2010 Wikipedia. All rights reserved.
- Best exam simulation CIW master-ciw-enterprise-developer download free trial.
- Pass SUN scbcd - SCBCD
- Download practice question and study guide for scdjws for exam.
- Best exam simulation SUN scja download free trial.
- Get certified in first attempt download scjp - SCJP simulation.
- Pass SUN scjp-5-0 - SCJP 5/6
- Click here to download scmad test study guide and practice question.
- Download free practice test for SUN SCWCD exam.
- Pass SCJA in first attampt.
- Download free practice test for CX310-055 Java 5.0 exam.
- Get certified in first attempt download CX310-065 - SCJP 6.0 simulation.
If you like this article, please leave a comment or subscribe this blog via RSS or via e-mail, Bookmark and share through your network. Click the AddThis button below. Thanks.