leetcode 逆转字符串 当年的第一题，今天再写一遍，物是人非

public class Solution {

    public String reverseWords(String s) {

        if(s==null||s.length()==0) return "";

        s=reverse(s);

        String s2[]=s.split("\\s+");

        StringBuffer sbf=new StringBuffer();

        for(int i=0;i<s2.length;i++)

        {

            sbf.append(reverse(s2[i])+" ");

        }

        return sbf.toString().trim();

    }

    public String reverse(String s)

    {

        char c[]=s.toCharArray();

        for(int i=0;i<c.length/2;i++)

        {

            char t=c[i];

            c[i]=c[s.length()-i-1];

            c[s.length()-i-1]=t;

        }

        return String.valueOf(c);

    }

}