charAt() StringBuffer Example

To manipulate string, java.lang.StringBuffer class comes with many methods, otherwise which will take long laborious coding as in C/C++. One such method is charAt() StringBuffer that returns the character at the specified index number passed as argument to the method.

What Java API says about charAt() StringBuffer:

• public synchronized char charAt(int index): Returns the character present at the specified index number in the string buffer. Negative index throws StringIndexOutOfBoundsException.

Following charAt() StringBuffer example illustrates.

public class Demo
{
  public static void main(String args[])
  {						
    StringBuffer sb1 = new StringBuffer("ABCDEF");
    char ch = sb1.charAt(2);                    // index number starts from 0
    System.out.println("Character present at index number 2: " + ch);  // C

    System.out.println("Character present at index number 10: " + sb1.charAt(10));
  }
}

Output screenshot on charAt() StringBuffer Example

Giving index number greater than the length of the buffer (number of characters present in the buffer) throws StringIndexOutOfBoundsException.

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