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.

 

水题

逐字符从后往前扫描遇到空格就返回就行了

    public int lengthOfLastWord(String s) {
        if(s == null || s.length() ==0){
            return  0;
        }
        s = s.trim();
        byte[] sBytes = s.getBytes();
        int j= sBytes.length-1;
        int total  = 0;
        while(j>=0 && sBytes[j] != 32){
            j --;
            total ++;
        }
        return total;
    }