String, StringBuffer, and StringBuilder

Question

Please tell me a real time situation to compare String, StringBuffer, and StringBuilder?

Answer 1

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                  String                    StringBuffer         StringBuilder
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Storage Area | Constant String Pool         Heap                   Heap 
Modifiable   |  No (immutable)              Yes( mutable )         Yes( mutable )
Thread Safe  |      Yes                     Yes                     No
 Performance |     Fast                 Very slow                  Fast
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