SOFTWARE DESIGN
DESIGN PATTERNS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Regarding the Observer Pattern, which statement is NOT correct?
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We can add new observers at any time.
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We never need to modify the subject to add new types of observers.
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We can reuse subjects or observers independently of each other.
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Changes to either the subject or an observer will always affect the other.
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Explanation:
Detailed explanation-1: -The Observer Pattern defines a one to many dependency between objects so that one object changes state, all of its dependents are notified and updated automatically. Explanation: One to many dependency is between Subject(One) and Observer(Many). There is dependency as Observers themselves don’t have access to data.
Detailed explanation-2: -The main disadvantage of the observer design pattern that subscribers are notified in random order.
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