_58.java

package com.fishercoder.solutions;
/**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 class _58 {

    public int lengthOfLastWord(String s) {
        if (s == null || s.length() == 0) {
            return 0;
        }
        s = s.trim();
        int n = s.length() - 1;
        while (n >= 0 && s.charAt(n) != ' ') {
            n--;
        }
        return s.length() - n - 1;
    }

}