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Which of this method of class StringBuffer is used to reverse sequence of characters?

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Which of this method of class StringBuffer is used to reverse sequence of characters?

(a) reverse()

(b) reverseall()

(c) Reverse()

(d) reverseAll()

I got this question in final exam.

This question is from StringBuffer Methods in portion String Handling of Java

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The correct answer is (a) reverse()

For explanation: reverse() method reverses all characters. It returns the reversed object on which it was called.

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