58. Length of Last Word

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Problem

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.

Example:

Input: "Hello World"
Output: 5

Code

class Solution {
    public int lengthOfLastWord(String s) {
        if(s == null || s.length() == 0) return 0;

        int i = s.length() - 1;
        while(i >= 0 && s.charAt(i) == ' '){
            i--;
        }

        int count = 0;
        while(i >= 0 && s.charAt(i) != ' '){
            i--;
            count++;
        }

        return count;
    }
}