JZ44 翻转单词顺序列

使用String.split(" ")

import java.util.*;
public class Solution {
    public String ReverseSentence(String str) {
        if(str==null||str.length()==0||str.trim().length()==0) return str;
        String[] strs=str.trim().split(" ");
        StringBuilder b=new StringBuilder();
        for(int i=strs.length-1; i>0; i--)
            b.append(strs[i]+" ");
        b.append(strs[0]);
        return b.toString();
    }
}