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What is the main difference between a String and a StringBuffer class?

String is immutable : you can’t modify a string object but can replace it by creating a new instance. Creating a new instance is rather expensive.


StringBuffer is mutable : use StringBuffer or StringBuilder when you want to modify the contents. StringBuilder was added in Java 5 and it is identical in all respects to StringBuffer except that it is not synchronized,which makes it slightly faster at the cost of not being thread-safe.

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