String Buffer methods in Java

The `StringBuffer` class in Java is used to create mutable (modifiable) strings. Here are some commonly used methods with examples:

1. append(String str)
Adds the specified string to the end of the buffer.
Example:
StringBuffer sb = new StringBuffer("Hello");

2. insert(int offset, String str)
Inserts the string at the specified position.
Example:
StringBuffer sb = new StringBuffer("Hello");

3. replace(int start, int end, String str)
Description: Replaces characters from `start` to `end` with the specified string.
Example:
StringBuffer sb = new StringBuffer("Hello World");

4. delete(int start, int end)
Removes characters from `start` to `end`.
Example:
StringBuffer sb = new StringBuffer("Hello World");

5. reverse()
Reverses the characters in the buffer.
Example:
StringBuffer sb = new StringBuffer("Hello");

6. capacity()
Returns the current capacity of the buffer.
Example:
StringBuffer sb = new StringBuffer();

These methods demonstrate how `StringBuffer` can be used for efficient string manipulation.