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What is the different between a StringBuilder and a StringBuffer?
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The StringBuilder class provides an API compatible with StringBuffer, but with no guarantee
of synchronization. This class is designed for use as a drop-in replacement for
StringBuffer in places where the string buffer was being used by a single thread
(as is generally the case). Where possible, it is recommended that this class
be used in preference to StringBuffer as it will be faster under most
implementations.
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The StringBuilder class provides an API compatible with StringBuffer, but with no guarantee
