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Question : 15

Total: 16

All three classes have a length() method.
Objects of type StringBuffer are thread-safe.
All three classes have overloaded append() methods
The "+" is an overloaded operator for all three classes.
According to the API, StringBuffer will be faster than StringBuilder under mostimplementations
The value of an instance of any of these three types can be modified through various methods in the API.

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