What is the difference between StringBuffer and Stringbuilder ?

Ans :- these are the difference between String Buffer and String Builder

s.No	String Buffer	String Builder
1.	StringBuffer is Synchronized	StringBuilder is non Synchronized
2.	StringBuffer is thread safe	StringBuilder is not thread safe
3	StringBuffer is less efficient than StringBuilder	StringBuilder is more efficient than StringBuffer
4.	StringBuffer is introduced in java 1.0	StringBuilder was introduced in java 1.5