58. Length of Last Word

要是都是空格的话 返回的array长度就是0

 

class Solution {
    public int lengthOfLastWord(String s) {
        if(s.length() == 0 || s == null) return 0;
        String[] str = s.split(" ");
        if(str.length != 0) {
            return str[str.length - 1].length();
        }
        return 0;    
        
    }
}