LeetCode 058 Length of Last Word

题目

---

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.

思路

---

1 大体逻辑很简单，就是从最后往前计数，碰到空格停止。

2 要考虑边角情况：最两边出现空格。全篇没有空格，全篇都是空格。

代码

---

public class Solution {    public int lengthOfLastWord(String s) {        s= s.trim();        if(s.length()==0){            return 0;        }        int ans =0;        for(int i=s.length()-1;i>=0;i--){            if(s.charAt(i)==' '){                break;            }            ans++;        }        return ans;    }}