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  Object Diagrams

Introduction to Object Diagrams

Object diagrams  models  the  instance of  things contained in a class diagram shows set of objects and their  relationships at any time modelling  a snapshot of system at that  moment  in time  and rendering  a set  of objects their  state and their  relationships.

To understand how  the object diagram works  visualize  a game  of soccer. It overview  looks  as if it  is a terribly simple  sport with a mob of people  running widely chasing  a ball. There hardly  seems  any systematic  sense in it.

Now  for a moment  freeze the motion  classify  the individual  players. We are able  to distinguish their particular  positions like forwards modified, left wing full back right back,  defenders goal  keepers ,etc. Further  insight reveals how  these players  collaborate following strategies  for attacking  and defending.

Similar to this  we ought  to have  the snapshot  of the  system under concern  to look  at the  objects present, their  neighbours and their  relationships to these neighbours.

Key points about objects diagrams are as follows:

1. Representation of a class and an object is same except for the  fact the instead of just  name  of the  objects the objects diagram  contains both name of the objects and the name of the class to which it  belongs  ( separated by a colon as shown in fig 8.16.)

2. Instead of the  term association as in class  diagrams here the link is used. Rest  of the conventions  are same.

Contents of Objects Diagram

  • Objects
  • Links

An object diagram expresses the  static part of an interaction, consisting  of the objects  of the  objects that collaborate but  without  any of  the message passed among  them.

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