Publish subscribe and the observer pattern In JavaChamp Team Flash

Question 20 / 69: In the Publish-Subscribe messaging model, the subscribers register themselves in a topic and are notified when new messages arrive to the topic. Which pattern does most describe this model?

A Adapter

B Notifier

C Observer

D State

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Explanation:

The Observer pattern is used to define a one-to-many dependency so that when one object changes state, all its dependents are notified and updated automatically.

This definition is perfectly describe Publish-Subscribe model, actually the Observer pattern is also known as Publish-Subscribe.

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