求最後一個單詞的長度

Java 1：

 1 class Solution {
 2     public int lengthOfLastWord(String s) {
 3         int len=0;
 4         int flag=0;
 5         for(int i=s.length()-1;i>=0;--i){
 6             if(s.charAt(i)!=‘ ‘){
 7                 if(flag == 0)
 8                     flag = 1;
 9                 len++;
 
10             }
11             if((i==0||s.charAt(i) == ‘ ‘)&&flag==1)
12                 return len;
13         }
14         return len;
15     }
16 }

java 2:

class Solution {
    public int lengthOfLastWord(String s) {
        return s.trim().length() - s.trim().lastIndexOf(" ") -1;
    }
}
 

Java 3:

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

58. Length of Last Word