leetCode 58.Length of Last Word (最后单词的长度) 解题思路和方法

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.

思路：题目非常easy，没什么好说的，唯一要注意的就是后面的结尾可能非常多空格。

详细代码例如以下：

public class Solution {

    public int lengthOfLastWord(String s) {

        int len = 0;

        boolean isEmpty = false;//从后往前数，直到不是空格

        for(int i = s.length()-1; i > -1; i--){

            if(s.charAt(i) != ' '){

                len++;

                isEmpty = true;

            }else if(isEmpty){//倒数第二个空格出现

                return len;

            }

        }

        return len;

    }

}