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String vs StringBuffer vs StringBuilder

What is the difference between String, StringBuffer and StringBuilder?

String: Java String object is an immutable i.e. unmodifiable. It can be created by two ways by literal and new keyword.

StringBuffer:
Java StringBuffer is mutable. It can be created by using the new keyword. It is a synchronized means thread-safe.

StringBuilder:
Java StringBuilder is mutable. It is non-synchronized means not thread-safe.
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