What is the difference between StringBuilder and Stringbuffer?

Question

Possible duplicate:
StringBuilder and StringBuffer in Java

What is the difference between StringBuilder and Stringbuffer?

Answer 1

Some methods in StringBuffer are synchronized, and StringBuilder is not thread safe - and faster.

Rule of thumb - use StringBuilder if you have no use case where StringBuilder is used by more than one thread (this will be a very rare case).

Answer 2

Taken from javadoc StringBuffer:

JDK 5, , thread, {@link StringBuilder}. StringBuilder , , .

StringBuffer , , , StringBuilder, .