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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