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StringBuffer vs StingBuilder

  1. StringBuilder is immutable but StringBuffer is mutable.

  2. StringBuffer is immutable but StringBuilder is mutable.

  3. StringBuffer is Synchronized but StringBuilder is not.

  4. They both are immutable.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

StringBuffer is synchronized (thread-safe) while StringBuilder is not. Both classes are mutable - they can be modified after creation. StringBuilder is faster when you don't need thread safety.

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