java using indexof to fin a space

1class Sample{
2public static void main(String[] args) {
3    String s = "1110 001";
4    int index = -1;
5    for(int i = 0; i < s.length(); i++ ){
6        if(Character.isWhitespace(s.charAt(i))){
7            index = i;
8            break;
9        }
10    }
11
12    System.out.println("Required Index : " + index);
13}
14}