The StringBuffer class in Java is used to create mutable (modifiable) string objects. Unlike String, which is immutable, StringBuffer allows changes to characters, length, and content without creating new objects. It is also thread-safe and synchronized.
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Which of the following creates an empty StringBuffer with default capacity?
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Question 4 of 15
4. Question
Which method is used to add text at the end of a StringBuffer?
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Question 5 of 15
5. Question
What is the default capacity of a newly created StringBuffer?
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Question 6 of 15
6. Question
Which method returns the current length of the StringBuffer?
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Question 7 of 15
7. Question
Which method can insert text at a specified index in StringBuffer?
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Question 8 of 15
8. Question
How do you delete characters from a StringBuffer?
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Question 9 of 15
9. Question
Which of the following methods reverses the characters in a StringBuffer?
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Question 10 of 15
10. Question
What happens when the capacity of StringBuffer is exceeded?
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Question 11 of 15
11. Question
Which of the following is TRUE about StringBuffer and StringBuilder?
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Question 12 of 15
12. Question
Which method sets the character at a specific index?
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Question 13 of 15
13. Question
Which method is used to get the internal capacity of the buffer?
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Question 14 of 15
14. Question
What is returned by the toString() method of StringBuffer?
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Question 15 of 15
15. Question
Which method replaces a sequence of characters in StringBuffer?
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Summary
The StringBuffer class is an essential tool for managing dynamic string content in a thread-safe manner. It supports methods like append(), insert(), delete(), and reverse() for efficient string manipulation and is preferred when string modifications are frequent and concurrent use is expected.
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