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Explain Which of these methods is used to notify observer the change in observed object?

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Which of these methods is used to notify observer the change in observed object? (a) update() (b) notify() (c) check() (d) observed() I had been asked this question in a national level competition. Query is from Observable & Timer Class in portion java.util – More Utility Classes of Java Select the correct answer from above options

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Right choice is (a) update() The best explanation: None.

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