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Which of these methods is called when observed object has changed?

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Which of these methods is called when observed object has changed?

(a) setChanged()

(b) update()

(c) notifyObserver()

(d) all of the mentioned

This question was addressed to me by my school principal while I was bunking the class.

I'd like to ask this question from Observable & Timer Class in chapter java.util – More Utility Classes of Java

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Right option is (d) all of the mentioned

Easy explanation: None.

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