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");
sb.append(" World");
System.out.println(sb); // Output: Hello World
2. insert(int offset, String str)
Inserts the string at the specified position.
Example:
StringBuffer sb = new StringBuffer("Hello");
sb.insert(5, " World");
System.out.println(sb); // Output: Hello World
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");
sb.replace(6, 11, "Java");
System.out.println(sb); // Output: Hello Java
4. delete(int start, int end)
Removes characters from `start` to `end`.
Example:
StringBuffer sb = new StringBuffer("Hello World");
sb.delete(5, 11);
System.out.println(sb); // Output: Hello
5. reverse()
Reverses the characters in the buffer.
Example:
StringBuffer sb = new StringBuffer("Hello");
sb.reverse();
System.out.println(sb); // Output: olleH
6. capacity()
Returns the current capacity of the buffer.
Example:
StringBuffer sb = new StringBuffer();
System.out.println(sb.capacity()); // Output: 16 (default capacity)
These methods demonstrate how `StringBuffer` can be used for efficient string manipulation.
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