[LeetCode] Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example,
Given s = "Hello World",
return 5.

 public int lengthOfLastWord(String s) {
        int length = s.length();
        int len = 0;
        
        int i = length - 1;
        while( i >= 0 && s.charAt(i) == ' '){
            i--;
        }
        
        while(i >= 0 && s.charAt(i) != ' '){
             i--;
             len++;
         }
            
        
        return len;
    }