Well !! One of the overriding principles of object-oriented development is the proper assignment of responsibility in the given application.It means that the application must be capable enough to sense the changes either caused because of internal or external resources.
If we look into the observer pattern ..it catagorises the arcitecture into two --
A) Observer object
B) Subject object
Its a general convention that only those objserver can observe the Changes which are registered to accept the changes and modify the field based on the modification.
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