LeetCode-Easy刷题(12) Length of Last Word

Posted 2022-05-31 当以乐

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;