逆轉字串leetcode

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public class Solution {            public  String reverseWords(String s) {          String ans=reverse(s);           String s2[]=ans.split("\\s+");         StringBuffer sb=new StringBuffer();         for(int i=0;i<s2.length;i++)         {                          sb.append(reverse(s2[i])+" ");                                   }                                           return  sb.toString().trim();                    }    private  String reverse(String s)    {                int len=s.length();        char c[]=s.toCharArray();        for(int i=0;i<len/2;i++)        {            char tem=c[i];            c[i]=c[len-1-i];            c[len-1-i]=tem;                                                        }         return String.valueOf(c);            }       }