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);
    }
}