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By acoin
via java.dzone.com
Published: Apr 25 2013 / 13:29

StringBuffer is a synchronized class for mutable strings. The main problem with making it synchronized is that (1) It was usually used as a local variable so making it synchronized just made it slower. (2) It was never a good idea to use it in a multi-threaded way.
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sproketboy replied ago:

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Er, hence StringBuilder. What is this 1997?

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