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SCJP 5.0 Misc. New API's (String Builder, Scanner, Formatter) Mock Exam Questions - 2 (12 Questions)

1) What is the difference between String Buffer and String Builder APIs?

1. String Buffer is the base class class for String Builder.
2. String Builder provides a more simplified API over the String Buffer class
3. The only difference between String Buffer and String Builder class is that String Buffer is thread safe whereas String Builder is not.
4. The only difference between String Buffer and String Builder class is that String Builder is thread safe whereas String Buffer is not.

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