What is difference between StringBuffer and StringBuilder in Java?

Question

I read many times but i doesn't know the difference some one help me to understood clearly ?

Answer 1

The difference between StringBuffer and StringBuilder are following:

StringBuffer is uses mutable String, all public methods are synchronized which makes it thread-safe but same time slow but In JDK 5 they provided StringBuilder which is copy of StringBuffer without synchronization.

StringBuilder is compatible with StringBuffer, but synchronization property is may not compatible.
StringBuilder is a little faster than StringBuffer.