Number of segments in String

Count the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space characters.

Please note that the string does not contain any non-printable characters.

Example:

Input: "Hello, my name is John"
Output: 5

Solution

public class Solution {
    public int countSegments(String s) {
        int res = 0;

        for(int i = 0;i < s.length();i++) {
            if(s.charAt(i) != ' ' && (i == 0 || s.charAt(i-1) == ' '))
                res ++;
        }

        return res;
    }
}