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String and StringBuffer

 
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Can anybody explain me when to use String and when the StringBuffer in an application? and Which one is better?
 
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StringBuffer has a performance advantage when you concatenate a lot of variable parts into one string. You can try some experiments on your target platform to see when "a lot" becomes worth the effort of using a StringBuffer.

StringBuffer is also mutable, meaning you can change it, while String is not.

Look through the doc and compare methods. What can one do that the other cannot?
 
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