Answer Posted / niranjanravi

String objects are constants and immutable where as
StringBuffer objects are not.StringBuffer Class supports
growable and modifiable string where as String class
supports constant strings. Strings once created we cant
modify them. Any such attempt will lead to the creation of
new strings.Where as StingBuffer objects after creation
also can be able to delete oo append any characteres to
it.String values are resolved at run time where as
StringBuffer valuesc are resolved at compile time.So if you
know the exact size of the string to be appended it is
better to go for String objects.

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