StringBuffer in java

1. Mutable Character Sequence:
StringBuffer provides a mutable buffer for storing characters. This means you can modify the contents of a StringBuffer object without creating a new object.
2. Constructors:
StringBuffer has several constructors, but the most commonly used one is the default constructor that creates an empty StringBuffer.
3. Appending and Inserting:
You can append characters or other data types to the end of the StringBuffer using the append() method.
4. Deleting and Replacing:
The delete() method removes a range of characters from the StringBuffer.
5. Capacity and Length:
The capacity() method returns the current capacity of the StringBuffer.
The length() method returns the number of characters in the StringBuffer.

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