String, StringBuffer & stringBuilder in JAVA

1] Differnces between the above three is:

   String is immutable

   StringBuffer & StringBuilders are mutable.

2] Differnces between the StringBuffer& stringBuiler:

   StringBuffer is synchronized.

   StringBuilder is unsynchronized.

3] On which scenario we have to use the above three?

   String: If the text is not going to change use a string Class because a String object is    immutable.

   StringBuffer: If the text can changes, and will be accessed from multiple threads, use a StringBuffer because StringBuffer is synchronous.

   StringBuilder : If the text can change and will only be accessed from a single thread, then use StringBuilder because StringBuilder is unsynchronized.