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.

基本编程题。

package leetcode;public class LengthofLastWord {public static void main(String[] args) {System.out.println(new LengthofLastWord().lengthOfLastWord(" a   "));}public int lengthOfLastWord(String s) {                int end = s.length() - 1;        while (end >= 0) {        if (s.charAt(end) == ' ') {        end--;        } else {        break;        }        }        int index = end;        while (index >= 0) {        if (s.charAt(index) != ' ') {        index--;        } else {        break;        }        }        return end - index;    }}