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Which of these methods of class StringBuffer is used to extract a substring from a String object?

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Which of these methods of class StringBuffer is used to extract a substring from a String object?

(a) substring()

(b) Substring()

(c) SubString()

(d) None of the mentioned

The question was asked in an online quiz.

Enquiry is from StringBuffer Methods in section String Handling of Java

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Best answer
Right choice is (a) substring()

The best I can explain: None.

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