Java StringBuffer deleteCharAt() Method

Last Updated : 10 Jan, 2025

In Java, the deleteCharAt() method of the StringBuffer class is used to delete the character at a specified index in the string.

Example 1: The below Java program demonstrates the use of deleteCharAt() to remove a character at a specific index from the string.

Java

// Removing a character at a specific index
class Geeks {
    public static void main(String[] args)
    {
        StringBuffer s = new StringBuffer("Hello, World!");
        System.out.println("Original String: " + s);

        // Delete character at index 5
        s.deleteCharAt(5);
        System.out.println("New String: " + s);
    }
}

Output

Original String: Hello, World!
New String: Hello World!

Note: After deletion, the subsequent characters are shifted left. It’s important to handle index bounds properly to avoid the StringIndexOutOfBoundsException.

Syntax

StringBuffer deleteCharAt(int index)

Parameter: index - The element you want to delete.
Return Type: This method returns the modified StringBuffer object with the character removed.

Note: If the index value is negative or an index greater than or equal to the length of the sequence, this methods throws an StringIndexOutOfBoundsException

Example 2: The below Java program demonstrates deleting a character at an invalid index throws a StringIndexOutOfBoundsException and handle it with a try-catch block.

Java

// Handling invalid index with exception
public class Geeks {
    public static void main(String[] args)
    {
        try {
          
            // Create an object of the StringBuffer
            StringBuffer sb
                = new StringBuffer("HelloWorld");
            System.out.println(
                "Before deletion, the string is: " + sb);

            // Initialize the index value
            int i = -5; // Invalid negative index
            System.out.println("The given index value is: "
                               + i);

            // Using the deleteCharAt() method
            System.out.println(
                "After deletion, the remaining string is: "
                + sb.deleteCharAt(i));
        }
        catch (IndexOutOfBoundsException e) {
            e.printStackTrace();
            System.out.println("Exception: " + e);
        }
    }
}