58. 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 class Solution {    public int lengthOfLastWord(String s) {        if(s=="")            return 0;        int len=s.length();        int i=len-1;        while(i>=0&&s.charAt(i)==' '){            --i;        }        if(i<0)            return 0;        int n=0;        while(i>=0&&s.charAt(i)!=' '){            ++n;            --i;            }        return n;    }}

WONDERFUL SOLUTION

    public int lengthOfLastWord(String s) {s = s.trim();    int lastIndex = s.lastIndexOf(' ') + 1;    return s.length() - lastIndex;        }