charAt (int index)

public synchronized char charAt(int index)

Returns the char value in this sequence at the specified index.

public class StringBufferCharAt {
    public static void main(String args[]){
        StringBuffer s1 = new StringBuffer("Hello");
        
        for(int i=0; i<s1.length(); i++){
            System.out.print("Character at index " + i + " is ");
            System.out.println(s1.charAt(i));
        }
    }
}

Output

Character at index 0 is H
Character at index 1 is e
Character at index 2 is l
Character at index 3 is l
Character at index 4 is o

1. Throws IndexOutOfBoundsException, if index is negative or greater than or equal to length().

public class StringBufferCharAtIndexOut {
    public static void main(String args[]){
        StringBuffer s1 = new StringBuffer("Hello");
        
        System.out.println("Character at index 5 is ");
        System.out.println(s1.charAt(5));
    }
}

Output

Character at index 5 is 
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 5
 at java.lang.StringBuffer.charAt(StringBuffer.java:204)
 at StringBufferCharAtIndexOut.main(StringBufferCharAtIndexOut.java:16)
Java Result: 1

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