string vs stringbuffer vs stringbuilder

http://javahungry.blogspot.com/2013/06/difference-between-string-stringbuilder.html

In summary here are list of difference between StringBuffer, String and StringBuilder in Java :

1) String is immutable while StringBuffer and StringBuilder is mutable object.

2) StringBuffer is synchronized while StringBuilder is not which makes StringBuilder faster than StringBuffer.

3) Concatenation operator “+” is internal implemented using either StringBuffer or StringBuilder.

4) Use String if you require immutability, use Stringbuffer in java if you need mutable + thread-safety and use StringBuilder in Java if you require mutable + without thread-safety.