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Home>IT Tests>Questions>Which Design Pattern should I use if I want an object to be notified when another kind of object state changed?

Question from the Object-oriented programming - Fundamentals test

Which Design Pattern should I use if I want an object to be notified when another kind of object state changed?

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If I want an object to be notified when another kind of object state changed, which Design Pattern should I use ?

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In this code, the class B extends the class A. The class B overrides the method talk() from the class A. The object b is an instance of the class B. The object a is an instance of the class A. The object a is assigned to the object b. The object a calls the method talk(). The method talk() from the class B is called.