Possible Duplicate:
StringBuilder and StringBuffer in Java
what is the difference between StringBuilder and Stringbuffer?
Possible Duplicate: StringBuilder and StringBuffer in Java what is the difference between StringBuilder and
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Possible Duplicate:
StringBuilder and StringBuffer in Java
what is the difference between StringBuilder and Stringbuffer?
Some methods in StringBuffer are synchronized while StringBuilder is not thread-safe – and faster.
Rule of a thumb – use StringBuilder unless you have a use case, where a StringBuilder is used by more then one Thread (which would be a very rare case).