public char charAt(int index){
  return internal.charAt(index);
}

public char charAt ( int index ) { return internal . charAt ( index ) ; }
the specified character of the sequence currently represented by the string buffer , as indicated by the index argument , is returned . the first character of a string buffer is at index 0 , the next at index 1 , and so on , for array indexing . the index argument must be greater than or equal to 0 , and less than the length of this string buffer .
