LeetCode-Easy刷题(12) 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.

Example:

Input: "Hello World"Output: 5

查找空格后最后一个单词的长度,如最后一个单词不存在返回0

   //基本编码    public static int lengthOfLastWord(String s) {        if(s ==null || s.length()<1){            return 0;        }        int index1 = s.length()-1;        while(index1>=0 && s.charAt(index1)==' '){            index1--;//到非空格位置终止        }        int index2 = index1;        while(index2>=0 && s.charAt(index2)!=' '){            index2--;//到空格位置终止        }        return index1 -index2;    }